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Добірка наукової літератури з теми "(p/e); Relative roughness height"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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Статті в журналах з теми "(p/e); Relative roughness height"

Yadav, Anil Singh, and J. L. Bhagoria. "Modeling and Simulation of Turbulent Flows through a Solar Air Heater Having Square-Sectioned Transverse Rib Roughness on the Absorber Plate." Scientific World Journal 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/827131.

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Solar air heater is a type of heat exchanger which transforms solar radiation into heat energy. The thermal performance of conventional solar air heater has been found to be poor because of the low convective heat transfer coefficient from the absorber plate to the air. Use of artificial roughness on a surface is an effective technique to enhance the rate of heat transfer. A CFD-based investigation of turbulent flow through a solar air heater roughened with square-sectioned transverse rib roughness has been performed. Three different values of rib-pitch (P) and rib-height (e) have been taken s

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Mishra, Arin, Aman Mehrotra, and S. Senthur Prabu. "Study on Performance Analysis of a Solar Air Heater with Aerofoil Shaped Rib Roughness Using CFD." ECS Transactions 107, no. 1 (2022): 16065–79. http://dx.doi.org/10.1149/10701.16065ecst.

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Present study investigates the heat transfer, friction factor and fluid flow characteristics of fully developed turbulent flow in a rectangular duct of solar air heater having aerofoil shaped rib-roughness on underside of absorber plate. ANSYS 14.5 has been used to simulate air flow through roughened air heater duct. Effect of relative roughness height and roughness pitch on Nusselt number and friction factor of roughened duct have been investigated and compared with that of smooth duct. It is found that the Nusselt number improves by attaching the roughness. Maximum enhancement in Nusselt num

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Ajay, Jain, and H. S. Sahu Prof. "CFD Analysis of Solar Air Heater for Enhancenment of Heat Transfer Through Inclined Rib Roughness." International Journal of Trend in Scientific Research and Development 3, no. 1 (2018): 662–67. https://doi.org/10.31142/ijtsrd19057.

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A 3 dimensional CFD analysis has been carried out of solar air heater to study heat transfer and fluid flow behavior in a rectangular duct of a solar air heater with one roughened wall having combination of circular and square transverse wire rib roughness. The effect of Reynolds number, roughness height, roughness pitch, relative roughness pitch and relative roughness height on the heat transfer coefficient and friction factor have been studied. In order to validate the present numerical model, results have been compared with available experimental results under similar flow conditions. CFD I

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Stalin, P. Michael Joseph, R. Lokanadham, Gaddam Naveen, et al. "Innovative cinque rib-roughened stimulators on performance improvement in triangular channel solar air heater." International Journal of Low-Carbon Technologies 19 (2024): 224–32. http://dx.doi.org/10.1093/ijlct/ctae002.

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Abstract Present study investigates application of cinque-faced rib roughening to improve the efficiency of solar air heaters (SAHs). Research focuses on a novel design, the cinque-faced rib-roughened triangular channel SAH (CFRTCSAH), which incorporates five-faced wire ribs on the absorber plate’s underside. By breaking down the laminar sublayer and enhancing flow separation and reattachment, - ribs significantly enhance heat transfer. It establishes a comprehensive theoretical model to analyze the thermal and hydraulic performance of the CFRTCSAH. The study considers the influence of paramet

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Rana, Jitesh, Anshuman Silori, Rajesh Maithani, and Sunil Chamoli. "Computational fluid dynamics analysis of a V-rib with gap roughened solar air heater." Thermal Science 22, no. 2 (2018): 963–72. http://dx.doi.org/10.2298/tsci160831010r.

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A CFD analysis of a solar air heater has been carried out using V-shaped ribs as artificial roughness on the absorber plate. The relative roughness pitch, P/e = 6-12, Reynolds number of 3800-18000, relative roughness height, e/D = = 0.042, and angle of attack, ? = 30?-75?, have been selected as design variables of V-shaped rib for analysis. The ANSYS FLUENT 15.0 with renormalization group k-? turbulence model is selected for the analysis of computational domain of solar air heater. The enhancement of Nusselt number and friction factor with Reynolds number for different values of a relative rou

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Childs, P. R. N., and M. B. Noronha. "1997 John P. Davis Award: The Impact of Machining Techniques on Centrifugal Compressor Impeller Performance." Journal of Turbomachinery 121, no. 4 (1999): 637–43. http://dx.doi.org/10.1115/1.2836715.

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A large proportion of modern centrifugal impellers are machined from solid forgings rather than made from cast metal. The CNC milling process offers options to manufacturers to minimize manufacturing costs while also enhancing the performance of the impeller. Efficient manufacturing can result in cutter tool marks and paths and associated roughness remaining on the hub and blade surfaces of impellers as a result of minimizing passes and maximizing the cut. The goal of manufacturers is to allow these marks to be as deep as possible to minimize machining costs, but without any negative effects o

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Placidi, M., and B. Ganapathisubramani. "Effects of frontal and plan solidities on aerodynamic parameters and the roughness sublayer in turbulent boundary layers." Journal of Fluid Mechanics 782 (October 9, 2015): 541–66. http://dx.doi.org/10.1017/jfm.2015.552.

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Experiments were conducted in the fully rough regime on surfaces with large relative roughness height ($h/{\it\delta}\approx 0.1$, where $h$ is the roughness height and ${\it\delta}$ is the boundary layer thickness). The surfaces were generated by distributed LEGO® bricks of uniform height, arranged in different configurations. Measurements were made with both floating-element drag balance and high-resolution particle image velocimetry on six configurations with different frontal solidities, ${\it\lambda}_{F}$, at fixed plan solidity, ${\it\lambda}_{P}$, and vice versa, for a total of twelve r

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Ritter, Severin, Kaspar Staub, and Patrick Eppenberger. "Associations between relative body fat and areal body surface roughness characteristics in 3D photonic body scans—a proof of feasibility." International Journal of Obesity 45, no. 4 (2021): 906–13. http://dx.doi.org/10.1038/s41366-021-00758-w.

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Abstract Introduction A reliable and accurate estimate of the percentage and distribution of adipose tissue in the human body is essential for evaluating the risk of developing chronic and noncommunicable diseases. A precise and differentiated method, which at the same time is fast, noninvasive, and straightforward to perform, would, therefore, be desirable. We sought a new approach to this research area by linking a person’s relative body fat with their body surface’s areal roughness characteristics. Materials and methods For this feasibility study, we compared areal surface roughness charact

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Khimsuriya, Yogeshkumar D., D. K. Patel, Vivek Patel, Hitesh Panchal, and Lav Kumar Kaushik. "Experimental study of the thermal efficiency of Solar air heater equipped with rotating spiral shape baffles: Using Solar Simulator." Journal of Physics: Conference Series 2818, no. 1 (2024): 012022. http://dx.doi.org/10.1088/1742-6596/2818/1/012022.

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Abstract This study investigates the thermal performance of a Solar Air Heater (SAH) equipped with rotating spiral-shaped baffles, utilizing a solar simulator. Parameters such as relative roughness pitch (P/e) and Reynolds number (Re) were varied within the ranges of 4-10 and 4000-12000, respectively, with a fixed relative roughness height (e/H) of 0.8. The fabricated solar simulator, adhering to EN-12975-2 standards, demonstrated excellent irradiance homogeneity at approximately 10.47%, resulting in an average solar irradiance of 955 W/m2. The introduction of artificial roughness on the absor

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Sumit, Kumar*1 and Dr. Manikant Paswan2. "COMPUTATIONAL INVESTIGATION OF THERMAL PERFORMANCE OF SOLAR AIR HEATER HAVING ROUGHNESS ELEMENTS AS TRANSVERSE WIRE ON THE TWO SIDE ABSORBER PLATE." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 7, no. 2 (2018): 664–74. https://doi.org/10.5281/zenodo.1184046.

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Анотація:

An Analytical investigation has been carried out to study the heat transfer and friction characteristics by using a transverse wire on the absorber plate of a solar air heater. The Analytical investigation consist the Reynolds number (Re) ranges from 3000 to 14 000, relative roughness pitch (p/e) 10–30 and relative roughness height (e/D) 0.0135-0.0225. The effect of these parameters on the heat transfer coefficient and friction factor has been discussed in the present paper and correlations for Nusselt number and friction factor has been developed within above limits. A procedure to comp

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Дисертації з теми "(p/e); Relative roughness height"

Jebelli, Ali. "Development of Sensors and Microcontrollers for Underwater Robots." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31283.

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Nowadays, small autonomous underwater robots are strongly preferred for remote exploration of unknown and unstructured environments. Such robots allow the exploration and monitoring of underwater environments where a long term underwater presence is required to cover a large area. Furthermore, reducing the robot size, embedding electrical board inside and reducing cost are some of the challenges designers of autonomous underwater robots are facing. As a key device for reliable operation-decision process of autonomous underwater robots, a relatively fast and cost effective controller based on F

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Книги з теми "(p/e); Relative roughness height"

Paeglīte, Ilze. Kustīgās slodzes dinamiskās iedarbes uz autoceļu tiltiem eksperimentāla izpēte un novērtējums. RTU Press, 2021. http://dx.doi.org/10.7250/9789934227028.

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Using data obtained from the dynamic load testing of bridges a method was developed to evaluate level of the dynamic performance without performing a dynamic load test. In this method a dynamic index of the bridge is calculated. Dynamic index allows to evaluate the dynamic performance level of existing and new structures taking into account such bridge parameters as span length / height ratio, natural frequency, vibration damping coefficient, relative deflection and international roughness index IRI. Dynamic index method can be used by bridge owners and maintainers to determine the dynamic pot

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Stańczykiewicz, Arkadiusz. Prawdopodobieństwo wystąpienia szkód w odnowieniach podokapowych wskutek pozyskiwania drewna oraz model ich szacowania. Publishing House of the University of Agriculture in Krakow, 2018. http://dx.doi.org/10.15576/978-83-66602-34-2.

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An analysis of the existing literature on the issue of damage to regeneration caused by timber harvesting, revealed that a great majority of results reported in those publications was obtained through laborious and time-consuming field research conducted in two stages. Field research methods for gathering data, employed by various authors, differed in terms of the manner of establishing trial plots, the accuracy of counting and evaluating the number of saplings growing on the investigated sites, classification systems used for distinguishing particular groups of regeneration based on quantitat

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Частини книг з теми "(p/e); Relative roughness height"

Ketut Aria Pria Utama, I., I. Ketut Suastika, and Muhammad Luqman Hakim. "The Phenomenon of Friction Resistance Due to Streamwise Heterogeneous Roughness with Modified Wall-Function RANSE." In Computational Fluid Dynamics [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99137.

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Surface roughness can reduce the performance of a system of fluid mechanics due to an increase in frictional resistance. The ship hull, which is overgrown by biofouling, experiences a drag penalty which causes energy wastage and increased emission levels. The phenomenon of fluid flow that passes over a rough surface still has many questions, one of which is the phenomenon of frictional resistance on heterogeneous roughness in the streamwise direction. In the ship hull, biofouling generally grows heterogeneous along the hull with many factors. RANSE-based Computational Fluid Dynamics was used t

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Geerlings Mirjam I., Brickman Adam M., Schupf Nicole, et al. "Depressive Symptoms, Antidepressant Use, and Brain Volumes on MRI in a Population-Based Cohort of Old Persons Without Dementia." In Advances in Alzheimer’s Disease. IOS Press, 2015. https://doi.org/10.3233/978-1-61499-542-5-229.

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We examined whether late-life depression, including depressive symptoms and antidepressant use, was associated with smaller total brain volume, smaller hippocampal volume, and larger white matter hyperintensity (WMH) volume in a large community-based cohort of old persons without dementia. Within the Washington/Hamilton Height-Inwood Columbia Aging Project (WHICAP), a community-based cohort study in northern Manhattan, 630 persons without dementia (mean age 80 years, SD=5) had volumetric measures of the total brain, hippocampus, and WMH at 1.5 Tesla MRI and data on current depression, defined

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Worthman, Carol M. "Evolutionary Perspectives on the Onset of Puberty." In Evolutionary Medicine. Oxford University PressNew York, NY, 1999. http://dx.doi.org/10.1093/oso/9780195103557.003.0007.

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Abstract Recent human history has witnessed worldwide, ongoing transformations of child growth and development. These changes are best documented by increasing height by age in children and decreasing ages at menarche. Increased size and accelerated maturation have always characterized privileged social groups or classes relative to those less privileged, but commencing about 130 years ago in a few western European countries, a pattern of accelerating development has swept across entire populations (Tanner, 1978, p. 152). Similar, though often more precipitous, shifts continue today in populat

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Yu Fei, Yu Jing, Chen Shanxiong, Zhang Yu, Li Jian, and Ojekunle V.O. "An Amended Calculation Method for the Additional Stress of High Filling Canals." In From Fundamentals to Applications in Geotechnics. IOS Press, 2015. https://doi.org/10.3233/978-1-61499-603-3-2354.

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Analytical design scheme for the calculation for the additional stress which is a prerequisite for the calculation of the settlement of high filling canals were performed using the finite element method to analyzes the distributive features and influencing factors of additional stress of trapezoid filling body. A considerable number of numerical calculations to study the variation law of additional stress of the filling body itself and the foundation along with changes of the slope ratio i, aspect ratio NHand relative depth NZ. were also conducted. To ascertain the reliability of this techniqu

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"Alanine Dosimetry in Italian National Institute of Ionizing Radiation Metrology (ENEA-INMRI)." In Book of Abstracts - RAD 2025 Conference. RAD Centre, Niš, Serbia, 2025. https://doi.org/10.21175/rad.abstr.book.2025.35.1.

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Purpose: Electron paramagnetic resonance (EPR) is a technique used to study materials with unpaired electrons (radicals). Alanine could serve as a radiation-detector material in which free radicals are produced after irradiation. Alanine has several features that make it suitable for medical dosimetry: tissue- equivalence, small size, small energy dependence of the response over a wide energy range, dose rate independence, low fading and the non-destructive readout. Last year, a new EPR spectrometer used for Alanine dosimetry was installed in the dosimetry laboratories of the Italian National

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Тези доповідей конференцій з теми "(p/e); Relative roughness height"

Wu, Fangyu, Rongqiao Xu, and Ye Xia. "Dynamic 3D Modeling of Vehicle-Bridge Interaction Systems Considering Foundation Settlement." In IABSE Symposium, Tokyo 2025: Environmentally Friendly Technologies and Structures: Focusing on Sustainable Approaches. International Association for Bridge and Structural Engineering (IABSE), 2025. https://doi.org/10.2749/tokyo.2025.2246.

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<p>Foundation settlement is a prevalent concern for bridges, since it acts as the principal source of excitation for vehicles upon entering the bridge. This research proposes bridge-vehicle 3D finite element model in ANSYS and Trucksim that incorporates the effects of foundation settlement to vehicle bridge interaction (VBI) responses, with a self-developed simulation program implemented in Python. The correctness and accuracy of the model and program are validated with measured data. Numerical simulations have also been performed to examine the effects of settlement shape and height, ve

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Gangwar, Sudhanshu, and Shuja Ahmed. "On Porosity and Flexural Strength of FDM Parts Printed using Short Carbon Fiber Reinforced Polyamide 6 Filament." In 3rd International Conference on Recent Advances in Materials and Manufacturing Technologies. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-hwcjw4.

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Fused deposition modeling (FDM) has several advantages, including design freedom, part customization, and ease of realizing complex geometries. However, there exist some challenges with the process; these include but are not limited to porosity, anisotropy, roughness, and material compatibility. This study is focussed on the additive manufacturing of polymer composites (short carbon fiber reinforced polyamide 6) through the process of FDM. Such 3D-printed parts are very lightweight and possess superior mechanical properties, which makes them a potential candidate for applications where a high

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Feng, Yanhui, Wei Liu, and Xinxin Zhang. "Numerical Analysis on the Radiant Characteristics of Three-Dimensional Random Rough Surfaces." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88576.

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In the area of micro- and nano-scale radiation heat transfer, the radiant characteristics of rough surfaces have drawn increasing attention. In this paper, three-dimensional Gaussian random rough surfaces were created by the Monte Carlo simulation method. Ray tracing method combined with the Kirchhoff approximation was employed to analyze the shadowing effect of random surfaces with different roughness. The relative scattering intensity from rough surfaces was further investigated by the Fresnel law. The results indicated that the peak of the relative scattering intensity occurred at the anti-

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Bulaha, Natalija. "Influence of various factors on determination accuracy of surface profile elements for engineering calculations." In 24th International Scientific Conference Engineering for Rural Development. Latvia University of Life Sciences and Technologies, Faculty of Engineering and Information Technologies, 2025. https://doi.org/10.22616/erdev.2025.24.tf111.

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As known, surface quality plays a special role in determining wear resistance because roughness greatly influences wear intensity, so the roughness parameter values must be defined with high precision. Since contact surfaces in friction pairs predominantly have pronounced anisotropy, it is important to study in detail the roughness profile parameter RSm (Mean profile element spacing) parallel to the processing traces, i.e. in the friction direction. The first problem concerns the choice of the sample evaluation area/length size to ensure the required determination accuracy of RSm. Secondly, th

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László, Noémi, and Péter Ficzere. "Investigation of Surface Roughness Determination Problems in Additive Manufacturing Technologies." In 9th International Scientific Conference on Advances in Mechanical Engineering. Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-sa2hyb.

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Besides conventional shaping methods like injection molding and extrusion, various additive manufacturing (AM) techniques have been steadily gaining prominence due to the numerous benefits they offer. These advantages include swift and uncomplicated shaping, the capability to produce components with intricate geometries during both the design and production phases, manufacturability enhancements, and cost-efficiency.In the context of the automotive industry, components produced often need to adhere to stringent standards. When it comes to these manufactured parts, the precision of processing a

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Buzzard, W., Z. Ren, P. Ligrani, C. Nakamata, and S. Ueguchi. "Influences of Target Surface Roughness on Impingement Jet Array Heat Transfer: Part 1 — Effects of Roughness Pattern, Roughness Height, and Reynolds Number." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56354.

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The present investigation considers the effects of special roughness patterns on impingement target surfaces to improve the effectiveness and surface heat transfer augmentation levels of impingement jet array cooling. This investigation utilizes various sizes, distributions, shapes, and patterns of surface roughness elements for impingement cooling augmentation. The surface roughness shape considered here is rectangle, in combination with larger rectangular pins. Combinations of small rectangle roughness and large pins are considered together, along with arrays of small rectangular roughness a

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Yao, Hua-Ping, and Ping Huang. "Numerical Study on Load Carrying Mechanism of Two Parallel Lubricated Rough Surfaces With Relative Motion." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44140.

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In the present paper, the load carrying mechanism of two parallel lubricated rough surfaces with relative motion is numerically analyzed from the microscopic view. It is found that each asperity of the surface forms mini-type convergent and divergent wedge sliders. The convergent wedge can create positive hydrodynamic pressure and forms a hydrodynamic lubrication film so that pressure is produced to bear an outside load. The Reynolds equation is used to analyze the influence of the roughness on the performances such as the pressure distribution, the load carrying capacity, the shearing force,

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Kameda, Takatsugu, Hideo Osaka, and Shinsuke Mochizuki. "Near-Wall Turbulent Structure for the Boundary Layer Developing Over a K-Type Rough Wall in Low-Reynolds-Number." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45191.

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Measurements of the mean and the turbulent velocities have performed in the vicinity of a roughness element for the turbulent boundary layer developed over a k-type rough wall, which consists of two-dimensional square ribs (10mm × 10mm × 400mm) arrayed with pitch ratio of 4. The Reynolds-number Rθ and k+ based on momentum thickness θ and roughness height k are about 500 and 50 respectively, and relative roughness height k / δ = 0.156. LDV (Laser Doppler Velocitimetry) that it is possible to measure reverse flow was applied to investigate the momentum-exchange process in the open-face (yT = 0(m

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Miao, Hui, Yong Huang, Fa Xie, Haigang Chen, and Fang Wang. "Effects of Dented Roughness on Laminar Flow and Heat Transfer in Microchannels." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22643.

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Liquid laminar flow and heat transfer characteristics for parallel plate micro-channels consisting of many triangle shape hollows to fit with the etching surfaces are investigated numerically in the present paper. The height of the channel is 50μm, with three different relative depths, three relative spacing, and three oblique angles of the triangle surface, respectively. The 2D N-S and energy equations are solved using a commercial CFD code FLUENT6.3. Water is used as the working fluid, and the Reynolds number ranges from 100 to 1500. The global Poiseuille number and average Nusselt number ar

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Liu, Xiangyun, Shuiting Ding, Zhi Tao, and Guoqiang Xu. "Heat Transfer Characteristic Inside Two-Pass Variable Cross-Section Channels With Ribs and Bleed Holes." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53529.

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Heat transfer characteristics were experimentally studied for two-pass channels with variable cross-section with and without ribs. Rectangular ribs were placed symmetrically on two opposite walls with attack angles of 90° and 60° to the main flow. The bleed holes were only distributed on the rib roughened surface along the second pass. The cross-section area of the channel varied in the way that it increased along the first pass and decreased along the second. The relative roughness heights were 0.092 and 0.123; the relative roughness pitches were 10 and 20. The experiments were carried out at

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Звіти організацій з теми "(p/e); Relative roughness height"

Bryant, Mary, Duncan Bryant, Leigh Provost, et al. Wave attenuation of coastal mangroves at a near-prototype scale. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45565.

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A physical model study investigating the dissipation of wave energy by a 1:2.1 scale North American red mangrove forest was performed in a large-scale flume. The objectives were to measure the amount of wave attenuation afforded by mangroves, identify key hydrodynamic parameters influencing wave attenuation, and provide methodologies for application. Seventy-two hydrodynamic conditions, comprising irregular and regular waves, were tested. The analysis related the dissipation to three formulations that can provide estimates of wave attenuation for flood risk management projects considering mang

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May, David, David Biedenharn, Tate McAlpin, and Ty Wamsley. Hydraulic dike effects investigation on the Mississippi River : Natchez to Baton Rouge. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/40539.

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This report documents an investigation of the hydraulic effects of dikes on water levels in the Mississippi River between Natchez, MS, and Baton Rouge, LA, conducted for the U.S. Army Corps of Engineers, Mississippi Valley Division, Vicksburg, MS. The investigation was conducted using a previously calibrated Natchez-to-Baton Rouge Adaptive Hydraulics numerical model. The objectives were to alter roughness and height variables associated with the dikes and overbanks encompassed in the numerical model and evaluate their effects on water surface elevations. This academic exercise provides an indi

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