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Relevant bibliographies by topics / Channels (Hydraulic engineering)

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Academic literature on the topic 'Channels (Hydraulic engineering)'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 July 2024

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Journal articles on the topic "Channels (Hydraulic engineering)"

1

Li, Dongfei, Ning Dai, Hongtao Wang, and Fujun Zhang. "Mathematical Modeling Study of Pressure Loss in the Flow Channels of Additive Manufacturing Aviation Hydraulic Valves." Energies 16, no. 4 (February 10, 2023): 1788. http://dx.doi.org/10.3390/en16041788.

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The application of additive manufacturing in the field of aviation hydraulics greatly improves the design freedom of hydraulic valve internal flow channels. Pressure loss in hydraulic valve internal flow channels is a primary factor that designers need to consider, and the rapid prediction of pressure loss is very helpful for flow channel design. At present, most studies only focus on how much the pressure loss in an additive manufacturing (AM) hydraulic channel is reduced compared with an original hydraulic channel, and a mathematical model of pressure loss in an AM curved channel is still lacking. In this paper, the pressure loss in a curved flow channel was firstly studied, and the main parameters affecting the pressure loss were determined using the dimensionless analysis method. Using computational fluid dynamics simulation, the relationships between the flow channel diameter, the flow channel length, the flow channel curvature radius, the fluid velocity and pressure loss were studied. According to the multiple regression analysis method, the mathematical model of pressure loss in aviation hydraulic channels was developed, and the model was solved based on the orthogonal experimental results. The pressure loss in the flow channel samples fabricated using selective laser melting was tested, and the results showed that the average error between the test results and the mathematical model calculation results was 7.72%. This model can be used to quickly predict the pressure loss in curved flow channels in the aviation hydraulic field.

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Hager, Willi H. "Trapezoidal side-channel spillways." Canadian Journal of Civil Engineering 12, no. 4 (December 1, 1985): 774–81. http://dx.doi.org/10.1139/l85-091.

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Steady flows in trapezoidal, prismatic side-channel spillways are analysed using a hydraulic approach. Distinction between channels of small and moderate bottom slopes is made. All results are presented in typical nondimensional quantities, by which an immediate application is made possible. Key words: open channel flow, spillway, gradually varied flow, discharge supply, hydraulics.

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Stefanyshyn, Dmytro V., Yaroslaw V. Khodnevich, and Vasyl M. Korbutiak. "Еstimating the Chézy roughness coefficient as a characteristic of hydraulic resistance to flow in river channels: a general overview, existing challenges, and ways of their overcoming." Environmental safety and natural resources 39, no. 3 (September 23, 2021): 16–43. http://dx.doi.org/10.32347/2411-4049.2021.3.16-43.

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This paper deals with results of a systemized overview of the Chézy roughness coefficient calculation problem as one most frequently used empirical characteristics of hydraulic resistance. The overview is given in the context of the formation of reliable empirical data needed to support hydro-engineering calculations and mathematical modelling of open flows in river channels. The problem topicality is because of a large number of practical tasks which need such a pre-research. In many cases, the accuracy of determining empirical hydraulic resistance characteristics can largely affect the accuracy of solving tasks relating to designing hydraulic structures and water management regardless of chosen mathematical models and methods.Rivers are characterized by a significant variety of flow conditions; hydraulic resistance to flows in rivers can thus vary widely determining their flow capacity. Considering the variety of river hydro-morphology and hydrology, the Chézy roughness coefficient often appears to be the most complete characteristic of hydraulic resistance to open flows in river channels comparing with other integral empirical characteristics of hydraulic resistance.At present, there are a large number of empirical and semi-empirical formulas to calculate the Chézy roughness coefficient. The main aim of this study was to analyze and systematize them in the context of providing proper support to the open channel hydraulics tasks. To achieve the aim of the study, a literature review regarding the problem of determining the integral hydraulic resistance characteristics to open flow in river channels was performed, as well as formulas used to calculate the Chézy roughness coefficient in practice were explored and systemized. In total, 43 formulas to calculate the Chézy roughness coefficient, as well as 13 formulas that can be used to estimate the Manning roughness coefficient were analyzed and systematized. Based on all these formulas, about 250 empirical equations can be compiled to calculate the Chézy coefficient depending on hydro-morphological peculiarities of rivers and river channels, hydraulic conditions, formulas application limits, and so on.

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Zuikov, Andrey, and Tatiana Suehtina. "Hydraulics of smoothly streamlined Venturi channels of critical depth." E3S Web of Conferences 91 (2019): 07021. http://dx.doi.org/10.1051/e3sconf/20199107021.

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The article relates to the field of hydraulics and engineering hydrology and is devoted to a study of fluid flow in a non-flooded Venturi channel. The purpose of the work is improvement of methods for calculating profiles and hydraulic characteristics of a Venturi flumes used for measurement of water flow rates in open channels and rivers. Research methods are analytical with experimental verification. A functional relationship is obtained between the Froude number in an arbitrary section of the Venturi channel and its width normalized by the width of the critical section. It is established that within a rectilinear gorge portion of a Venturi channel, the flow is unstable, which is related to the proximity of its parameters to the critical ones. The method of optimization of a profile of a Venturi channel with a dividing cross-section in a gorge that does not contain empirical coefficients is considered. It is shown that the proposed method allows determining all main geometric parameters and hydraulic characteristics of the Venturi flume, including its flow rate coefficient, distribution of depths and flow velocities along the length of a flume with a relative error of ±1%.

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Verdiyev, A. "The Method of Predicting the Confidence Interval by the Culvert Capacity of Channels at the Design Stage." Bulletin of Science and Practice, no. 12 (December 15, 2022): 372–81. http://dx.doi.org/10.33619/2414-2948/85/44.

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The purpose of the research is to develop a methodology for predicting confidence intervals of functional parameters of main channels at the design stage, taking into account the probability of absolute changes occurring in their hydraulic parameters during construction and operation. In this regard, taking into account that during the construction and operation of main channels, the frequency of absolute changes in the values of the living cross-section area, wetted perimeter, hydraulic radius and bottom slope obeys the normal distribution law, and the channel roughness coefficient is an increasing and arbitrarily variable random variable, the possibility of predicting the probable confidence interval for the channel’s culvert over the period of operation is investigated. For this purpose, the Monte Carlo method and the Excel program were used, and a method for predicting the confidence interval of the design value of the channel flow rate was proposed. The corresponding analyses were carried out according to the design values of hydraulic parameters on the studied sections of the main channels operated in the Republic of Azerbaijan. Assuming that the design value of each hydraulic parameter is an average value, and the mean square deviation is within the probability, the generation of normally distributed random variables is compiled (provided that the channel roughness coefficient is an increasing and arbitrarily variable value in the appropriate limit), and according to the flow formula for a steady uniform movement, the maximum flow rate of the channel is calculated. The confidence interval of the average value of the predicted maximum flow rate is determined and compared with the design value of the maximum flow rate on the studied section of the trunk channel. Based on the proposed method, the effect of influencing the average value of the maximum flow rate was analyzed in the case of the roughness coefficient of the channel remains unchanged, and probabilistic scattering of other hydraulic parameters occurs around the design values, as well as, in general, the corresponding hydraulic parameters are scattered around the design values.

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Voinov, Nikolaj Aleksandrovich, Anastasiya Viktorovna Bogatkova, Nina Vladimirovna Deryagina, Denis Andreevich Zemtsov, and Nataliya Yul`evna Kozhukhova. "RESISTANCE OF TANGENTIAL SWIRLERS WITH ANNULAR CHANNELS." chemistry of plant raw material, no. 1 (March 10, 2022): 335–42. http://dx.doi.org/10.14258/jcprm.2022019670.

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A review of vortex apparatuses and processes in which a rotating gas-liquid flow is used as an intensification of heat and mass transfer is presented. It is shown that tangential swirlers, which are easy to manufacture and compact, have found the greatest application in industrial practice for creating gas (steam) rotation. It is experimentally established that tangential swirlers with annular walls of channels intended for gas passage have the lowest hydraulic resistance. The data on the hydraulic resistance of tangential swirlers with annular channels, velocity and pressure obtained experimentally and by calculation in a wide range of variation of the design parameters of the device are presented. The dependences between the hydraulic resistance of the swirler and its design parameters are revealed. Numerical simulation of the parameters of the gas flow in the channels is carried out. Diagrams of the pressure and velocity distribution are presented and analyzed, and experimental data on the influence of the design parameters of the swirler channel, such as width and length, on its hydraulic resistance are confirmed. An empirical dependence for determining the hydraulic resistance coefficient of a tangential swirler with annular channels is presented for engineering calculations.

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Voinov, Nikolaj Aleksandrovich, Anastasiya Viktorovna Bogatkova, Nina Vladimirovna Deryagina, Denis Andreevich Zemtsov, and Nataliya Yul`evna Kozhukhova. "RESISTANCE OF TANGENTIAL SWIRLERS WITH ANNULAR CHANNELS." chemistry of plant raw material, no. 1 (March 10, 2022): 335–42. http://dx.doi.org/10.14258/jcprm.2022019670.

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A review of vortex apparatuses and processes in which a rotating gas-liquid flow is used as an intensification of heat and mass transfer is presented. It is shown that tangential swirlers, which are easy to manufacture and compact, have found the greatest application in industrial practice for creating gas (steam) rotation. It is experimentally established that tangential swirlers with annular walls of channels intended for gas passage have the lowest hydraulic resistance. The data on the hydraulic resistance of tangential swirlers with annular channels, velocity and pressure obtained experimentally and by calculation in a wide range of variation of the design parameters of the device are presented. The dependences between the hydraulic resistance of the swirler and its design parameters are revealed. Numerical simulation of the parameters of the gas flow in the channels is carried out. Diagrams of the pressure and velocity distribution are presented and analyzed, and experimental data on the influence of the design parameters of the swirler channel, such as width and length, on its hydraulic resistance are confirmed. An empirical dependence for determining the hydraulic resistance coefficient of a tangential swirler with annular channels is presented for engineering calculations.

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Thomas and, Luis, and Beatriz Marino. "Lock-Exchange Flows in Non-Rectangular Cross-Section Channels." Journal of Fluids Engineering 126, no. 2 (March 1, 2004): 290–92. http://dx.doi.org/10.1115/1.1677475.

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Lock-exchange flows driven by density differences in non-rectangular cross-section channels are investigated in situations that resemble estuaries, navigation canals and hydraulic engineering structures. A simple analytical model considering stratified flows suggests practical relationships corroborated by results of laboratory experiments carried out in a straight channel of triangular cross-section.

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Joldassov, S. К., S. T. Abildaev, and S. J. Tattibaev. "ON METHODS FOR DETERMINING THE ROUGHNESS COEFFICIENT OF CHANNELS ALONG THE PERIMETER." Herald of the Kazakh-British technical university 20, no. 3 (October 4, 2023): 76–88. http://dx.doi.org/10.55452/1998-6688-2023-20-3-76-88.

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The scientific article deals with the issues of uniform movement of the riverbed and the determination of the roughness coefficient of the riverbed (roughness coefficient). The analysis of existing methods for calculating the difference in the roughness coefficients of channels along the perimeter, methods for determining the roughness coefficient of the slopes of channels consisting of two or three parts along the perimeter, well–known scientists - P.N.Belokon, G.K.Lotter, N.N.Pavlovsky are given.There are a some varieties of calculation methods assigned for hydraulic calculations of water flow along the perimeter of a soil channel in the field of hydraulic engineering. A number of researchers states that the roughness of the channel bed imitates the motion of the flow in diverse channels with the movement of the flow under the ice layer. Nevertheless, it should be taken into account that the roughness of the channel bed has its own characteristic (specific) features of the movement of water in different open channels and below the ice cover. The common formulas proposed by number of authors for channels with different roughness along the perimeter cannot be used directly in hydraulic calculations of the flow under the ice cover, and vice versa, the equations of motion of water flow beneath the ice cover are not applied even for channels with various roughness along the perimeter. Therefore, the corresponding choice of methods for determining the roughness coefficients of the canal flow along the perimeter will be the key point to its long-term functioning.

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Ortloff, Charles R. "Tipon: Insight into Inka Hydraulic Engineering Practice." Latin American Antiquity 30, no. 4 (December 2019): 724–40. http://dx.doi.org/10.1017/laq.2019.70.

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The site of Tipon, Peru, located about 30 km east of Cuzco, provides an example of Inka knowledge of hydraulic engineering and the civil engineering practices used in the design and operation of the complex water system. The inhabitants of Tipon used river- and spring-sourced surface and subterranean channels to convey, distribute, and drain water to and from multiple agricultural platforms, reservoirs, and urban ceremonial centers. Intricate intersecting surface and subterranean channel systems that combined and regulated water flows from different sources controlled the water to and drainage from 13 terraced agricultural platforms. This design served to maintain different ground moisture levels to sustain specialty crops. Within the site are fountains and multiple water display features requiring sophisticated hydraulic engineering necessary for aesthetic displays. To understand the technology used by the Inka to design the water systems at Tipon, I used computational fluid dynamics methodology and modern hydraulic engineering theory. I made computer models of key elements of the Principal Fountain and the Main Aqueduct to reproduce water flow patterns in these features as intended by Inka engineers’ designs and calculations. The Inka hydraulic technology used complex engineering principles similar to those in modern civil engineering practice centuries ahead of their formal discovery in Western hydraulic science.

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Dissertations / Theses on the topic "Channels (Hydraulic engineering)"

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Davis, Gary Stanley. "A laboratory investigation of a rock riprap control structure in an open channel." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/21006.

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Dickman, Brian Daniel. "Large scale roughness in open channel flow." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/22953.

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Shumate, Eric Dean. "Experimental Description of Flow at an Open-Channel Junction." Thesis, University of Iowa, 1998. https://ir.uiowa.edu/etd/5368.

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Papadopoulou, Symela. "Velocity distribution in shallow open channel flow over square bar roughness." Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=58994.

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Ebisa, Fola Miressa. "Downstream hydraulic geometry of clay-dominated cohesive bed stream channels." Thesis, University of Ottawa (Canada), 2007. http://hdl.handle.net/10393/27838.

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Empirical downstream hydraulic geometry equations for clay-dominated cohesive bed (semi-alluvial) streams were derived using the data from five streams in eastern Ontario and four streams from other regions. The width exponent (0.57) is comparable to the exponents reported for previous studies; however, depth exponent (0.52) was greater for clay-dominated cohesive bed than for typical gravel-bed and sand-bed rivers. Furthermore, the recurrence intervals of bankfull discharges of those streams range from 1 to 2 years. To the author's knowledge, this is the first study which related bankfull hydraulic variables and discharges to derive downstream hydraulic geometry equations specifically for clay-dominated cohesive bed streams. Assessment of width:depth ratio depicted that large channels were deeper and narrower than comparable gravel-bed channels, but small channels were actually wider and shallower than typical gravel-bed rivers. This can likely be attributed to the resistance of stiff and consolidated cohesive-bed to erosive effects of more frequent flows.

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Hardwick, Richard Ian. "The behaviour of meandering channels in flood." Thesis, University of Aberdeen, 1992. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=192102.

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This study had three primary aims. Firstly, to establish the flow resistance characteristics of meandering channels in flood with different inner channel sinuosities and morphology. Secondly, to gain a better understanding of the coherent flow structures and energy loss mechanisms present within such flows. Third, to establish a link between the identified energy loss mechanisms and the flow resistance behaviour of channels with different geometry. The study begins with a review of current literature appertaining to three flow systems. These were; Inbank flow through meandering channels, overbank flow through channels comprising a straight channel with straight parallel floodplains, and meandering channels with floodplain flow. The available literature with regards to flooded meandering channels was limited to a handful of studies. It was clear there existed a deficiency in stage-discharge data over a range of inner channel sinuosities, and the flow descriptions given were limited to inner channels of relatively low sinuosity i.e. 1.25 - 1.3, rectangular or trapezoidal cross-section and unrealistically low width to depth (aspect) ratio. In addition, the influence of roughened floodplains also required further study. To address these needs, a small-scale laboratory investigation was undertaken at Aberdeen, together with a large-scale collaborative experimental study centred at the SERC Flood Channel Facility. These two experimental studies, in which two inner channels of sinuosity 1.4 and 2 were investigated in detail, are described. The experimental techniques and data collection procedures used are also described. The data types collected include: stage- discharge data, flow visualisation, flow velocity measurement, water surface profiles and bed shear stress analysis using an erodible bed. The stage-discharge data were used for the following; to establish the relationship between inner channel sinuosity and overall channel flow resistance; to establish the effect of inner channel morphology on overall channel resistance: and to assess the implications of roughened floodplains on resistance behaviour. The analysis of these data, together with existing related overbank data, yielded a number of conclusions; i). Overall flow resistance increases as inner channel sinuosity increases, ii). At deep floodplain flows, a floodplain comprising a trapezoidal inner channel was less efficient than one comprising a smaller natural inner channel, iii). Roughening the floodplains has a significant effect on channel resistance characteristics. The flow description data, of overbank flow, revealed the presence of coherent flow structures in flows over inner channels of sinuosity 1.4 and 2, and at a number of flow depths. It is suggested these coherent flow structures are a source of additional energy loss, and a link is proposed between the vigour and frequency of these structures for several flow conditions and channel geometries, and the overall resistance behaviour. Contour maps of water surface elevation are presented for several flow conditions and channel geometries. An increase in surface relief was observed as floodplain depth, and therefore velocity, increased. These maps and earlier related work were then discussed. Plots of near bed velocities, secondary circulation patterns and erodible bed observations strongly indicated a change in sediment erosion and deposition patterns, and thus a change in inner channel morphology during overbank flow. Implications of this change are proposed and discussed. Finally, suggestions for future work are presented. with particular emphasis on a 3-dimensional numerical model presently under development at the University of Aberdeen.

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Cabral, Mariza Castanheira de Moura da Costa. "Effects of spatial constraints on channel network topology : implications for geomorphological inference /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/10147.

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Shea, Charles Brian. "Optimal well location in contaminant plume remediation." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/19465.

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Ratzlaff, Steven Abraham. "Optimal well location in contaminant plume containment." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/20017.

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Sadiq, Aftab. "Clear-water scour around bridge abutments in compound channels." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/19308.

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Books on the topic "Channels (Hydraulic engineering)"

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Sturm, Terry W. Open channel hydraulics. 2nd ed. Dubuque, IA: McGraw-Hill, 2010.

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Open channel hydraulics. Amsterdam: Elsevier/BH, 2006.

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Litrico, Xavier. Modeling and Control of Hydrosystems. London: Springer London, 2009.

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Chow, Ven Te. Open-channel hydraulics. New York: McGraw-Hill, 1988.

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Chanson, Hubert. The hydraulics of open channel flow: An introduction ; basic principles, sediment motion, hydraulic modelling, design of hydraulic structures. 2nd ed. Oxford [UK]: Elsevier Butterworth Heinemann, 2004.

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Chow, Ven Te. Open-channel hydraulics: All title in it. New York: McGraw-Hill, 1988.

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Hydraulics of open channel flow. Reston, VA: ASCE Press, 1998.

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J, Ashworth Philip, ed. Coherent flow structures in open channels. Chichester: J. Wiley, 1996.

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9

Müller, Ulrich. Magnetofluiddynamics in Channels and Containers. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001.

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French, Richard H. Open-channel hydraulics. New York: McGraw-Hill, 1986.

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Book chapters on the topic "Channels (Hydraulic engineering)"

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Smith, Kenneth V. H. "Regime Approach to the Design of Drainage Channels." In Hydraulic Design in Water Resources Engineering: Land Drainage, 305–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-22014-6_29.

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Baek, Kyong Oh, and Il Won Seo. "Equation for Streamwise Variation of Secondary Flow in Sinuous Channels." In Advances in Water Resources and Hydraulic Engineering, 580–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89465-0_100.

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Sarbu, Ioan. "Hydraulic Calculation of Open Channels and Sewer Columns in Buildings." In Advances in Building Services Engineering, 817–38. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64781-0_10.

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Srinivasan, Vajapeyam S., and Hugo M. Alcantara. "A Bed form Based Resistance Function for Alluvial Channels from Experimental Data." In Advances in Water Resources and Hydraulic Engineering, 803–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89465-0_141.

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Huang, Caian, and Jin Zhang. "On the Energy Used for Suspended Sediment by Water in Open-Channels." In Advances in Water Resources and Hydraulic Engineering, 826–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89465-0_145.

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Galvin, L. F. "Impermeable Soils Require Stable Channels and Good Crack Formation for Effective Drainage." In Hydraulic Design in Water Resources Engineering: Land Drainage, 413–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-22014-6_39.

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He, Zigan, Hangen Ni, and Yakun Liu. "The Explicit Solution of the Sequent Depth Ratio for the Hydraulic Jump in Trapezoidal and Triangular Channels." In Advances in Water Resources and Hydraulic Engineering, 1546–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89465-0_268.

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Bobkov, A., and S. Chepurnykh. "Evaluating the Influence of Perforated Baffle on Hydraulic Resistance of Impeller Machine Diffuser Channels." In Lecture Notes in Mechanical Engineering, 118–25. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-85233-7_14.

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Patel, Pooja, Rohan Kar, and Arindam Sarkar. "Estimation of Velocity Index for Flow Calculation in Open Channels Using Geometric and Hydraulic Characteristics." In Lecture Notes in Civil Engineering, 223–32. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-9151-6_19.

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Samani, Zohrab A. "Open-Channel Hydraulics." In Hydraulic and Hydrologic Engineering, 89–116. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003287537-5.

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Conference papers on the topic "Channels (Hydraulic engineering)"

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Rogers, Jerry R., Glenn O. Brown, Jerry L. Anderson, and Lindell E. Ormsbee. "Civil Engineering History of Hydraulic Channels and Pipes." In Great River History Symposium at World Environmental and Water Resources Congress 2009. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41032(344)4.

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Paniagua, J. C., U. S. Rohatgi, and V. Prasad. "Thermal Hydraulic Instabilities During Startup Transients in Two Heated Parallel Channels." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0846.

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Abstract In multiple channel systems, channel dynamics can be coupled to one another and be independent of the remaining flow loop or one unstable channel may dominate the transients and make the multiple parallel channel system behave as one single channel. In the single channel case, the whole loop participates in the flow oscillations, whereas in a two parallel channel system the flow oscillations occur in the channels and can be out-of-phase. Previous studies indicated the instabilities are due to condensation in a low pressure natural circulation two parallel channel loop at low powers and inlet subcoolings. A thermal hydraulics computer code was developed to simulate the geysering instability and is based on integral methods where local properties are based on local pressures and the vapor generation model is adjusted accordingly to reflect the vapor generation rate necessary to initiate the instability. This is an important modeling feature since local vapor generation rate depends on local saturation temperature. The code is designed to simulate startup transients in two heated parallel channel natural circulation systems with subcooled water as an initial condition. The numerical simulations illustrated flow reversal in the individual channels, which is a thermal hydraulic feature of condensation-induced geysering.

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Liang, Guohu, Deqi Chen, Feng Jin, Lian Hu, Shanshan Bu, and Hanzhou Liu. "Numerical Investigation on Thermal-Hydraulic Characteristics of Supercritical CO2 in Multiple Compact Channels." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-93241.

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Abstract Printed circuit heat exchanger (PCHE) is promising in the application of energy conversion system with its high compactness and efficiency. In this paper, the flow and heat transfer performance of supercritical carbon dioxide (SCO2) PCHE are numerically investigated with multiple channels and different channel lengths. The results show that the heat transfer performance of the Zigzag channel PCHE is increased more than 11% comparing to the wavy channel, while it brings more flow resistance. The pressure drop in the Zigzag cold and hot channels was about two and four times of the wavy channel, respectively. It is recommended for the wavy channel PCHE on account of its better overall performance factor than zigzag channel PCHE. Through the analyses of flow characters among multiple channels, it shows good homogeneity of flow distribution for the flow distribution coefficient in each channel close to 1.0, which is able to effectively avoid uneven flow distribution resulting in high local temperature of the heat exchanger. Furthermore, the overall performance of PCHEs with different core lengths are compared, presenting nearly 10% difference on the thermal efficiency.

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Wang, Mei, Yan Wen, Suizheng Qiu, Guanghui Su, and Weifeng Ni. "Experimental Study on Thermal-Hydraulic Performance of Single-Phase Water Flow in Narrow Rectangular Channel." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75848.

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The purpose of this study is to discover the differences of pressure drop and heat transfer of single-phase water flow between conventional channels and narrow rectangular channels. Furthermore, the differences between the level and the vertical channel have been studied. The gap of the test channel is 1.8mm. Compared with conventional channels, the narrow rectangular channel showed differences in both flow and heat transfer characteristics. The critical Reynolds number of transition from laminar flow to turbulent flow is 900∼1300, which is smaller compared with conventional channels. The friction factor is larger than that of the conventional channels and the correlation of friction factor with Reynolds number was given by experimental results. From the relation graph of Nusselt number and Reynolds number, the demarcation of the laminar flow region and turbulence flow region is obvious. In laminar region, Nusselt number almost remained constant and approximately consistent with numerical simulation results. While in turbulent region, Nusselt number increased significantly with increasing Reynolds number. A new Nusselt number correlation was obtained based on Dittus-Boelter equation, and the coefficients were less about 13% than that of Dittus-Boelter equation.

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Liu, Liang, Tao Zhou, Yu Li, Wanxu Cheng, Juan Chen, Shanfang Huang, and Yanping Huang. "Thermal-Hydraulic Analysis for Experimental Device of Supercritical Water Reactor-Fuel Qualification Test." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30176.

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The China EU cooperation project SCWR-FQT small experimental reactor is selected as the research object. The new SCWR-FQT calculation code is made. Thermal performance of four channels are analyzed. The results show that: During normal condition, the coolant temperature increases gradually and pressure reduces gradually. The highest temperature of the coolant does not exceed 450°C working limit, meets the design safety requirement. When transient of entrance temperature occurs, lateral two channels are affected significantly. The inside channel has maximum temperature stability because of the minimum affection. The increasing of the entrance temperature will shorten the time of the relative inner two channels to reach stable. When transient of entrance flow occurs, the inside channel has the maximum affection. The decreasing of the entrance flow will increase the time of the inside channel to reach stable. The entrance flow should not lower than 49.2% of the normal operating mode.

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Watanabe, Noriyuki, Muhammad Hadid Subki, Hiroshige Kikura, and Masanori Aritomi. "Thermal Hydraulic Instability Characteristic in Natural Circulation Parallel Boiling Channels Upflow System Under Low Pressure." In 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49219.

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Natural circulation BWR actively equipped with passive safety features has been promoted to solve the recent challenges in BWR nuclear power and safety technology. With regard to startup stage, various thermo-hydraulic instabilities might be induced due to an elimination of re-circulation pumps. A lot of studies have been made on the instabilities in evaporated system as well as in a reactor. In the instabilities, geysering accompanied with flow reversal phenomena has been investigated in a vertical closed loop, U-shaped closed loop, twin parallel channels, and so on. However, in twin parallel study the effect of non-heated length on geysering has not been sufficiently clarified. The objective of this research is to experimentally investigate the thermo-hydraulic instabilities, particular in geysering, with a natural circulation loop consisting of parallel boiling channels and the single connection channel, which simulates the basic flow around the reactor core in the system pressure range from atmospheric to 0.7MPa. The parallel boiling channels are consisted of heated and non-heated section. The heated section forms annulus and heated from the inner wall. The input heat flux range of 0 up to 580kW/m2, and inlet subcooling temperatures of 5, 10, and 15K respectively, are imposed in the experiments. In the parallel channels with non-heated risers, three types of thermo-hydraulic instabilities were detected in the following sequence, geysering, natural circulation oscillation, and density wave oscillation. Especially in Geysering, it is induced due to rapid condensation in the non-heated risers and it is not be suppressed even at 0.7MPa though it has a tendency to be suppressed with an increase in the system pressure. On the other hand, in the parallel channels without non-heated risers, sinusoidal oscillation similar to natural circulation oscillation has been detected, and geysering had never observed. The new findings are that the sinusoidal oscillation is induced due to the hydrostatic head fluctuation in the connection channel, where the flow regime is constantly slug flow. The oscillating period is well correlated with the sum of delay time for boiling and passing time of slug bubbles in the connection channel. From the facts described above, it is found that non-heated region in a channel box should be as shorter as possible to prevent geysering from occurring, and sinusoidal oscillation similar to natural circulation oscillation is induced in any configuration of parallel channels.

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Zhang, Weizhong. "Thermal Hydraulic Analysis of a SCWR Core Concept." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16217.

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A Super Critical Water Reactor (SCWR) single channel analysis model was built considering energy coupling between water rods and coolant channels. By using this model, a comparative study was performed on SCWR fuel assembly arrangement such as the size and location of water rods and fuel pins. Cladding temperature, pellet centerline temperature, and coolant core-outlet velocity were selected as comparison criteria. Preliminary core conceptual design of 1000 MWe SCWR was carried out and two sets of main parameters for SCWR core were proposed.

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Ma, Yingying, Wenxi Tian, Guanghui Su, Libo Qian, Youjia Zhang, Yanping Huang, Yanlin Wang, and Suizheng Qiu. "Theoretical Research on Flow Instability in Parallel Channels Under Motion Conditions." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16476.

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In motion conditions, in addition to gravitational acceleration, a new acceleration was developed and it was added to the thermal hydraulics characteristics in flow channels. The additional acceleration leads to the different thermal hydraulic characteristics and will trigger the flow oscillation and even flow instability in parallel channels. In order to study the effect of the additional acceleration on the flow oscillation, the corresponding physical models are established in this work. Through the deduction of the mathematical model, the code for flow instability under motion conditions with Gear algorithm is developed. The flow oscillation curves, critical power, marginal stability boundary (MSB) are obtained. After comparison and analysis, it is found that some motion conditions lead to flow periodic oscillation. Different flow passage position results in different oscillation amplitudes. The marginal stability boundaries (MSB) under different motion conditions fit well, that is, the effect of motion conditions on MSB is small. Number of channels has little effect; however, channel arrangement influences the flow in every channel. These conclusions are of great significance in marine reactor design.

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Turcotte, B., B. Morse, and F. Anctil. "Hydraulic and Hydrological Regime of Ice-Affected Channels at Freezeup." In Cold Regions Engineering 2012. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412473.024.

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Olayiwola, Nurudeen O., and S. Mostafa Ghiaasiaan. "Assessment of Flow Boiling Heat Transfer Correlations for Application to Mini-Channels." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13579.

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Cooling systems that consist of mini-channels (channels with hydraulic diameters in the 0.5 mm to 2.0 mm range) and micro-channels (channels with hydraulic diameters in the 100 μm-500 μm range) can dispose of large volumetric thermal loads that are well beyond the feasible range of conventional cooling methods. Mini/micro-channel systems that utilize boiling fluids are particularly useful due to the superiority of boiling heat transfer mode over single-phase flow convention. Flowing boiling in mini and micro channels has been investigated experimentally by several research groups recently, and a number of empirical correlations have been developed, usually based on only a single set of experimental data. In this study, the capability of a number of widely used forced flow boiling correlations for application to mini channels is examined by comparing their predictions with experimental data from three separate sources. The tested correlations include well-established methods for conventional boiling systems, as well as correlations recently proposed for mini-channels. The experimental data all represent mini-channels. Based on these comparisons, the most accurate existing predictive methods for the tested mini-channel boiling data are identified.

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Reports on the topic "Channels (Hydraulic engineering)"

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Malej, Matt, and Fengyan Shi. Suppressing the pressure-source instability in modeling deep-draft vessels with low under-keel clearance in FUNWAVE-TVD. Engineer Research and Development Center (U.S.), May 2021. http://dx.doi.org/10.21079/11681/40639.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) documents the development through verification and validation of three instability-suppressing mechanisms in FUNWAVE-TVD, a Boussinesq-type numerical wave model, when modeling deep-draft vessels with a low under-keel clearance (UKC). Many large commercial ports and channels (e.g., Houston Ship Channel, Galveston, US Army Corps of Engineers [USACE]) are traveled and affected by tens of thousands of commercial vessel passages per year. In a series of recent projects undertaken for the Galveston District (USACE), it was discovered that when deep-draft vessels are modeled using pressure-source mechanisms, they can suffer from model instabilities when low UKC is employed (e.g., vessel draft of 12 m¹ in a channel of 15 m or less of depth), rendering a simulation unstable and obsolete. As an increasingly large number of deep-draft vessels are put into service, this problem is becoming more severe. This presents an operational challenge when modeling large container-type vessels in busy shipping channels, as these often will come as close as 1 m to the bottom of the channel, or even touch the bottom. This behavior would subsequently exhibit a numerical discontinuity in a given model and could severely limit the sample size of modeled vessels. This CHETN outlines a robust approach to suppressing such instability without compromising the integrity of the far-field vessel wave/wake solution. The three methods developed in this study aim to suppress high-frequency spikes generated nearfield of a vessel. They are a shock-capturing method, a friction method, and a viscosity method, respectively. The tests show that the combined shock-capturing and friction method is the most effective method to suppress the local high-frequency noises, while not affecting the far-field solution. A strong test, in which the target draft is larger than the channel depth, shows that there are no high-frequency noises generated in the case of ship squat as long as the shock-capturing method is used.

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Martin, S., Larry Daggett, Morgan Johnston, Chris Hewlett, Kiara Pazan, Mario Sanchez, Dennis Webb, Mary Allison, and George Burkley. Houston Ship Channel Expansion Improvement Project – Navigation Channel Improvement Study : ship simulation results. Coastal and Hydraulics Laboratory (U.S.), November 2021. http://dx.doi.org/10.21079/11681/42342.

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In 2020, the US Army Engineer Research and Development Center (ERDC), Coastal and Hydraulics Laboratory, provided technical oversight during a navigation study to assist the Galveston District evaluation of different channel widening alternatives for larger ships transiting the Houston Ship Channel (HSC), Texas. The widening proposals encompassed several areas of the HSC including the Bay Section, the Bayport Ship Channel, Barbours Cut Channel, and the Bayou Section. The study was performed at the San Jacinto College Maritime Technology and Training Center (SJCMTTC) Ship/Tug Simulator (STS) Facility in La Porte, TX. The SJCMTTC STS is a real-time simulator; therefore, events on the simulator happen at the same time rate as real life. A variety of environmental forces act upon the ship during the simulation transit. These include currents, wind, waves, bathymetry, and ship-to-ship interaction. Online simulations of the project were conducted at SJCMTTC over a 3-week period – May through June 2020. Several mariners including Houston Pilots and G&H tugboat Captains participated in the testing and validation exercises. ERDC oversight was performed remotely because of the COVID-19 pandemic. Results in the form of engineering observations, track plots, and pilot interviews were reviewed to develop final conclusions and recommendations regarding the final design.

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Howard, Adam, Jang Pak, David May, Stanford Gibson, Chris Haring, Brian Alberto, and Michael Haring. Approaches for assessing riverine scour. Engineer Research and Development Center (U.S.), May 2021. http://dx.doi.org/10.21079/11681/40702.

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Calculating scour potential in a stream or river is as much a geomorphological art as it is an exact science. The complexity of stream hydraulics and heterogeneity of river-bed materials makes scour predictions in natural channels uncertain. Uncertain scour depths near high-hazard flood-risk zones and flood-risk management structures lead to over-designed projects and difficult flood-risk management decisions. This Regional Sediment Management technical report presents an approach for estimating scour by providing a decision framework that future practitioners can use to compute scour potential within a riverine environment. This methodology was developed through a partnership with the US Army Engineer Research and Development Center, Hydrologic Engineering Center, and St. Paul District in support of the Lower American River Contract 3 project in Sacramento, CA.

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Brown, Jasen, Robert Davinroy, Ivan Nguyen, Aron Rhoads, Nathan Lovelace, Emily Russ, and Jessamin Straub. Tombigbee River : River Miles 81.0-76.0 sediment management study. Engineer Research and Development Center (U.S.), April 2022. http://dx.doi.org/10.21079/11681/43942.

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The US Army Corps of Engineers, St. Louis District, Applied River Engineering Center (AREC), in cooperation with the Operations Branch of the Mobile District, conducted a sediment management study of the Sunflower Bend reach of the Tombigbee River, between River Miles 81.0 and 76.0, near Jackson, AL. The objective of the study was to look at sediment management alternatives to alleviate or eliminate repetitive maintenance dredging. These alternatives involved various river engineering measures including dikes, weirs, channel armoring, disposal armoring, and combinations thereof. A physical Hydraulic Sediment Response model was used to examine the sediment response resulting from these alternatives. During model testing, and after discussions with AREC and Mobile Operations Division staff, a second objective was established to define existing non-erodible bed materials that were located throughout the reach. This was conducted to examine the merits of strategically removing these erosion resistant materials in the river as an additional dredging/excavation alternative. The most favorable alternatives involved removing bedload sand and consolidated clay material from between River Miles 79.1 and 78.0 to improve navigation.

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Sekoni, Tosin, Mark Eberle, Brian Durham, and Matthew Balazik. The use of native vegetation for structural stability in dredged material placement areas : a case study of Beneficial Use Site 4A, Chocolate Bayou, Brazoria County, Texas. Engineer Research and Development Center (U.S.), September 2023. http://dx.doi.org/10.21079/11681/47588.

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This technical note is the third in a series about using native plant communities to enhance dredge material placement areas (DMPAs), confined disposal facilities (CDFs), and projects where dredged sediments are used for various engineering purposes. DMPAs and CDFs occur in numerous locations spanning different geographic locations nationwide. Oftentimes, these containment dikes are constructed using earthen materials. The materials are either barged in from an off-site location or obtained on-site from new or virgin materials, consisting of heavy clay particles and sediments removed from the nearby channel. In the Gulf Coast region of the United States, new or virgin materials are obtained during channel deepening activities using mechanical or hydraulic dredging methods. Examples of these dredging methods include hopper dredge, pipeline dredge, and excavator or bucket dredge. When materials are considered suitable for beneficial use purposes, and following environmental compliance, the materials are often used to construct containment dikes in DMPAs and CDFs. The project site used in this study—Beneficial Use Site 4A (BUS 4A)—used dredged material during its construction and has periodically received dredged material to maintain its target elevation of 2 ft (0.67 m) above the mean lower low water; hence, this site presents an opportunity for use as a demonstration study. Project goals include (1) demonstrating the use of native plant communities to provide structural stability, (2) introducing targeted vegetation establishment on DMPAs and CDFs as a management strategy to improve engineering and environmental outcomes, and (3) providing technology transfer to the U.S. Army Corps of Engineers (USACE) districts through hands-on planting techniques and installation of natural material (in this demonstration, coir logs).

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