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Journal articles on the topic 'Collector roughness and flow parameters'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Dr., Ashwini Kumar*. "A REVIEW REPORT FOR HEAT TRANSFER AND FLUID FLOW CHARECTRISTICS." Global Journal of Engineering Science and Research Management 4, no. 10 (2017): 98–120. https://doi.org/10.5281/zenodo.1034495.

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Solar air heaters are one of the simplest and cost effective solar energy utilization systems for various drying applications. The thermal efficiency of solar air heaters is found to be low due to low heat transfer coefficient on the air side. Attempts have been made to enhance the heat transfer rate from the absorber plate to air by using different roughness elements. Enhancement of heat transfer coefficient is achieved by providing artificial roughness, always goes with an increment of pressure drop and more pumping power is required. So, there is a need to optimize the system parameters to

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Luca, Mihail, Nicolae Marcoie, Alexandru-Lucian Luca, and Daniel Toma. "Elements of hydraulic calculation of permanent movement at non-standard sewer collectors." IOP Conference Series: Earth and Environmental Science 1136, no. 1 (2023): 012034. http://dx.doi.org/10.1088/1755-1315/1136/1/012034.

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Abstract An important issue in the design of the main visitable sewer collectors is the hydraulic calculation in permanent movement and non-permanent movement. Some main collectors that can be visited have non-standard flow sections, a situation that complicates the hydraulic calculation. Non-standard flow sections derive from standard sections (circular, ovoid, bell, rectangular and mixed) through natural and anthropogenic degradation processes. The initially designed section changes over time in terms of shape, dimensions and roughness, a situation in which determining the hydraulic paramete

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Ebissa, G. K. Dr. K. S. Hari Prasad. "Estimation of open channel flow parameters by using optimization techniques." INTERNATIONAL JOURNAL OF ENGINEERING DEVELOPMENT AND RESEARCH Volume 5 | Issue 2 | May 2017, Volume 5 | Issue 2 | May 2017 (2017): Page Number(s) — 1049–1073. https://doi.org/10.5281/zenodo.583720.

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Open channel flow parameter estimation is an inverse problem, which involves the prediction of a function within a domain, given an error criterion with respect to a set of observed data. Various numerical methods have been developed to estimate open channel flow parameters. For this study, Genetic Algorithm optimization technique is selected. Because of its inherent characteristics, Genetic Algorithm optimization technique avoids the subjectivity, long computation time and ill-posedness often associated with conventional optimization techniques. The present study involves estimation of open c

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Pranav, Mehta, Kumar Sumit, Patel Vivek, and Joshi Alpesh. "Mathematical modeling and performance assessment of solar air collector." Indian Journal of Science and Technology 13, no. 18 (2020): 1803–10. https://doi.org/10.17485/IJST/v13i18.608.

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Abstract <strong>Background:</strong> The use of solar air heater in drying has been increasing in recent years, because of their simplicity and economic configuration. <strong>Methods:</strong> Design and testing of the corrugated solar collector have been carried out in the present study. The overall system was designed and tested at Gujarat Power Engineering and Research Institute, Mehsana, India (GPERI, 23◦31'37.4"N72◦23'14.1"E). Exergetic efficiency, thermal efficiency, and temperature outlet at the same mass flow rate and solar irradiance were the major parameters for the

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Nguyen, Thanh-Cong, Dung Hoang Tien, Ba-Nghien Nguyen, and Quang-Cherng Hsu. "Multi-Response Optimization of Milling Process of Hardened S50C Steel Using SVM-GA Based Method." Metals 13, no. 5 (2023): 925. http://dx.doi.org/10.3390/met13050925.

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This study aims to find the optimized parameters for surveying the milling process of S50C steel in a minimum quantity lubrication (MQL) environment using a support vector machine-genetic algorithm (SVM-GA). Based on the experimental matrix designed by the Taguchi method, surface roughness and cutting force data were collected corresponding to each experiment with changes in input parameters such as cutting speed, tooth feed rate, and axial depth of cut, along with changes in two parameters of the minimum lubrication system: flow rates and injection pressure. Through analysis by the SVR-NSGAII

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Nagayach, Neeraj Kumar, Kanishk Sharma, Yogesh Agrawal, and Anil Singh Yadav. "Revisiting the Effect of Rib Roughness on the Performance of Solar Air Heater." E3S Web of Conferences 430 (2023): 01264. http://dx.doi.org/10.1051/e3sconf/202343001264.

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The energy collected from various renewable resources, such as sunlight, geothermal warmth, wind, and water, is referred to as renewable power. The sun is the ultimate source of vitality. Solar radiation vitality can be utilized in many functions, such as heating buildings and dusty foliage crops, dying chicken, wood taste, and treating modern elements. All the energy patterns in nature asking them are the origin of the sun. The solar air heater (SAH) is very common along with commonly applied sun-oriented heating apparatus. Perhaps, SAH is utilized for a wide range of applications, from resid

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Antico, Federica, Ana Ricardo, and Rui Ferreira. "The Logarithmic Law of the Wall in Flows over Mobile Lattice-Arranged Granular Beds." Water 11, no. 6 (2019): 1166. http://dx.doi.org/10.3390/w11061166.

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The purpose of the present paper is to provide further insights on the definition of the parameters of the log-law in open-channel flows with rough mobile granular beds. Emphasis is placed in the study of flows over cohesionless granular beds composed of monosized spherical particles in simple lattice arrangements. Potentially influencing factors such as grain size distribution, grain shape and density or cohesion are not addressed in this study. This allows for a preliminary discussion of the amount of complexity needed to obtain the log-law features observed in more realistic open-channel fl

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8

KOSICHENKO, YU M., and O. A. BAEV. "FEATURES OF HYDRAULIC AND FILTRATION CALCULATIONS OF THE DRAINAGE AND IRRIGATION SYSTEM." Prirodoobustrojstvo, no. 4 (2021): 90–98. http://dx.doi.org/10.26897/1997-6011-2021-4-90-98.

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Calculations of the main characteristics of the conducting network of the drainage and irrigation system are given. The method of hydraulic calculation of the conducting network of the trapezoidal cross-section to be reconstructed is presented. The following data are taken as the initial data: the depth of the flow, the area of the live section, the wetted perimeter, the slope of the channel bed, the roughness coefficient. In this case, the roughness coefficient should be specified according to the reference data, taking into account the state of the riverbed. The following channel parameters

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Suk, Ladislav, Kamil Števanka, Taron Petrosyan, and Daniel Vlček. "INVESTIGATION OF CRITICAL HEAT FLUX ON ABRADED INCONEL 625 TUBE." Acta Polytechnica CTU Proceedings 28 (December 1, 2020): 15–22. http://dx.doi.org/10.14311/app.2020.28.0015.

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Aim of this work was to study flow boiling in an annular channel at low pressure and low flow on a tube with modified surface roughness. The tube with the outer diameter of 9.14 mm and the heated length of 380 mm was made of Inconel 625 and was manually modified using 150 grit sandpaper. The tube was placed in a glass tube with an inner diameter of 14.8 mm. Outlet pressure was set to 120, 200 and 300 kPa with varying mass flow from 400 to 600 kg/(m2.s). A high speed camera was used to record several experiments to fully understand ongoing phenomena. Surface roughness was analysed using a confo

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10

Matoušek, Václav, and Jan Krupička. "On equivalent roughness of mobile bed at high shear stress." Journal of Hydrology and Hydromechanics 57, no. 3 (2009): 191–99. http://dx.doi.org/10.2478/v10098-009-0018-9.

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On equivalent roughness of mobile bed at high shear stressThe friction conditions at the top of a mobile bed are discussed for flows in the upper-plane-bed regime, i.e. for the flows with values of the bed Shields parameter larger than approximately 0.6. A special attention is devoted to flows of the bed Shields parameter bigger than 2. Experimental data for flows at high bed shear are collected from literature and new data are added from own measurements of flows of a 1.36-mm sand slurry in the 100-mm pipe loop of the Institute of Hydrodynamics. The database represents flows of very different

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Boukhari, Imed, Lotfi Zeghadnia, Fares Laouacheria, et al. "Design of Collection System Parameters Using Known Reference Pipe Method (KRPM)." Asian Journal of Water, Environment and Pollution 18, no. 3 (2021): 21–30. http://dx.doi.org/10.3233/ajw210025.

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The storm water drainage network is generally calculated based on the Manning equation, where the slope, roughness of the pipe wall, and flow are known, while conversely the velocity, diameter, and hydraulic radius are unknown characteristics, although they are very important for the work done by a hydraulic engineer who needs these parameters to find their values, including the students taking coursework relating to waste-water engineering. The computation of these parameters in partially full pipes and based on the Manning equation is implicit and needs to be computed using iterative and lab

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Reyes-Aguilera, José A., Liliana Villafaña-López, Elva C. Rentería-Martínez, Sean M. Anderson, and Jesús S. Jaime-Ferrer. "Electrospinning of Polyepychlorhydrin and Polyacrylonitrile Anionic Exchange Membranes for Reverse Electrodialysis." Membranes 11, no. 9 (2021): 717. http://dx.doi.org/10.3390/membranes11090717.

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The saline gradient present in river mouths can be exploited using ion-exchange membranes in reverse electrodialysis (RED) for energy generation. However, significant improvements in the fabrication processes of these IEMs are necessary to increase the overall performance of the RED technology. This work proposes an innovative technique for synthesizing anion exchange membranes (AEMs) via electrospinning. The AEM synthesis was carried out by applying a high voltage while ejecting a mixture of polyepichlorohydrin (PECH), 1,4-diazabicyclo [2.2.2] octane (DABCO® 33-LV) and polyacrylonitrile (PAN)

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Neville, Rachel A., Patrick D. Shipman, Steven R. Fassnacht, Jessica E. Sanow, Ron Pasquini, and Iuliana Oprea. "A New Formulation and Code to Compute Aerodynamic Roughness Length for Gridded Geometry—Tested on Lidar-Derived Snow Surfaces." Remote Sensing 17, no. 12 (2025): 1984. https://doi.org/10.3390/rs17121984.

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The roughness of the Earth’s surface dictates the nature of air flow across it. Detailed meteorological data that are necessary to access the aerodynamic roughness (z0) are not widely collected and, as such, the geometry of a surface can be used to estimate z0. Here, we present a novel formulation, and the corresponding computer code, to compute z0 based on the Lettau (1969) geometric approach. The new code produces a mean z0, as well as a histogram of all z0 values for each individual roughness element (e.g., 10 s of thousand for the 1000 × 1000 grids) discretized using watersheds, as well as

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Livya, E., R. Abishaveni, M. D. Ashika Deepthi, P. Ranjitha, and S. Nadaraja Pillai. "Analyzing the aerodynamic characteristics of eroded wind turbine blades." IOP Conference Series: Earth and Environmental Science 1161, no. 1 (2023): 012015. http://dx.doi.org/10.1088/1755-1315/1161/1/012015.

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Abstract The study investigates the influence of erosion over the leading edge of S809 series airfoil and its impact on the aerodynamic performance of wind turbine blades. The research work determines how erosion affects the performance of wind turbine blades at an angle of attack varying from 0° to 45° for the fixed Reynolds number of 2.1 x 105. To analyse the flow characteristics, the average pressure acting around the surface of the airfoil is scanned with the aid of 20 pressure taps. The time series pressure of 10,000 samples at each point has been collected. The roughness is introduced at

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15

Bakri, B., S. Pallu, Sulhairi, S. Pongmanda, Y. Arai, and M. Ihsan. "Effects of Fluctuation in Discharge and Head on Flow Parameters and Head Losses in Pipeline Networks." IOP Conference Series: Earth and Environmental Science 1117, no. 1 (2022): 012069. http://dx.doi.org/10.1088/1755-1315/1117/1/012069.

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Abstract Discharge, head, flow velocity and Reynolds number are flow parameters in pipe networks. On the other hand, energy loss is one of the factors that affect the capacity of the pipe as a means of distributing water flow. Energy loss is caused by several factors including the roughness of the pipe walls associated with the pipe material. Due to the lack of attention to the interrelationship of these factors, sometimes there are piping networks that do not work optimally or do not function as expected. The purpose of this study was to determine the effect of changes in discharge and head o

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Reis, Guilherme da Cruz dos, Tatiane Souza Rodrigues Pereira, Geovanne Silva Faria, and Klebber Teodomiro Martins Formiga. "Analysis of the Uncertainty in Estimates of Manning’s Roughness Coefficient and Bed Slope Using GLUE and DREAM." Water 12, no. 11 (2020): 3270. http://dx.doi.org/10.3390/w12113270.

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River discharge data are critical to elaborating on engineering projects and water resources management. Discharge data must be precise and collected with good temporal resolution. To elaborate on a more accurate database, this paper aims to quantify the uncertainty generated while applying Bayesian inference through the GLUE and DREAM methods. Both methods were used to estimate hydraulic parameters and compare between them with Manning’s equation. Throughout the statistical analysis, the uncertainties in the application of the models are used to determine the parameters of Manning’s roughness

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Vivek, Singh, Singh Ajay, and Verma Ashish. "A Review on Experimental Analysis of Double Pass Solar Air Heater With Baffled Absorber Plate." International Journal of Trend in Scientific Research and Development 1, no. 6 (2017): 496–500. https://doi.org/10.31142/ijtsrd3556.

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This review paper based on the study of different type of solar air heater with baffled fin and without using baffle fin. It has been observed that the thermal efficiency of baffled duct type solar air heater is higher than smooth duct solar air heater. Highest thermal performance advantage in wide range of air flow rate. The heat transfer coefficient between the absorber plate and air can be considerably increased by using artificial roughness on the bottom plate and under the absorber plate of a solar air heater duct. Study and analysis of roughness and operating parameters on heat transfer.

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18

Page, Philip R. "The Sensitivity of a Water Distribution System to Regional State Parameter Variations." Mathematical Problems in Engineering 2018 (May 29, 2018): 1–11. http://dx.doi.org/10.1155/2018/6938483.

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The sensitivity of a pressurised water distribution system (WDS) to state parameter variations is studied. A novel local regional sensitivity analysis (LRSA) approach is introduced which applies the same change to a collection of parameters, called a region. For example, sensitivity to suburbs can be studied. General analytical (using algebraic methods) results are derived. They show how sensible conclusions arise from LRSA and state this dependence of the WDS on regions for the first time. For most cases, the WDS is 1.852–2 times more sensitive to pipe roughness coefficients than to pipe leng

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19

Tiensuu, Henna, Satu Tamminen, Esa Puukko, and Juha Röning. "Evidence-Based and Explainable Smart Decision Support for Quality Improvement in Stainless Steel Manufacturing." Applied Sciences 11, no. 22 (2021): 10897. http://dx.doi.org/10.3390/app112210897.

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This article demonstrates the use of data mining methods for evidence-based smart decision support in quality control. The data were collected in a measurement campaign which provided a new and potential quality measurement approach for manufacturing process planning and control. In this study, the machine learning prediction models and Explainable AI methods (XAI) serve as a base for the decision support system for smart manufacturing. The discovered information about the root causes behind the predicted failure can be used to improve the quality, and it also enables the definition of suitabl

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Lenin, Adithya, Pandurangan Arumugam, Aruna Prakasa Rao, and Angayarkanny Subramanian. "A novel biomimetic nanocomposite exhibiting petal wetting phenomenon: fabrication and experimental investigations." Surface Topography: Metrology and Properties 10, no. 1 (2022): 015005. http://dx.doi.org/10.1088/2051-672x/ac49dd.

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Abstract A functional composite material that simultaneously exhibits hydrophobicity and water droplet adhesion has monumental potential in controlling fluid flow, studying phase separation, and biological research. This article reports the fabrication of a petal wetting biomimetic Boron Nitride Nanotubes (BNNTs) -Polydimethylsiloxane (PDMS) nanocomposite achieved by drop casting. The petal effect was investigated by non-destructive techniques. The nanotubes were synthesized by chemical vapor deposition at 1150 °C and were characterized by x-ray diffraction, scanning electron microscopy, and h

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Ndomba, Preksedis M., and Joel Nobert. "Problems and Prospects of Hydraulic Modelling For Environmental Flows Assessment Studies in East Africa." Tanzania Journal of Engineering and Technology 34, no. 2 (2013): 67–83. http://dx.doi.org/10.52339/tjet.v34i2.460.

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The objective of this paper is to document the problems and prospects of hydraulic modelling for Environmental Flows Assessment (EFA) studies based on selected case studies. Most of studies in East Africa use Holistic methodologies. An ideal data set for defining river hydraulics for most of these methods would be six data points of stage measurements over a good distribution of discharges, the stage of zero discharge and some flood-related data. Besides, in East African region EFA studies suffer from data scarcity (i.e., poorly gauged sites) and limited expertise and funding. The hydraulics s

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Zhang, Jianchao, Xuehong De, Zhihong Yu, Wenbin Guo, Yan Ge, and Xiaochao Chen. "Effectiveness of Biomass Pellet Parameters on Their Fractal Dimension." Applied Sciences 12, no. 19 (2022): 9841. http://dx.doi.org/10.3390/app12199841.

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In order to perform quantitative analysis and predict the wear of the forming channel, this study makes biomass pellets as experimental samples. The surface morphology was scanned by a scanning electron microscope (SEM), and the surface morphology data and images were collected by a roughness instrument. Then, we collected the data of arithmetical average deviation Ra, density ρ, as well as hardness HD, and further calculated the fractal dimension D, which help to study the influencing factors of fractal dimension on the circular surface morphology of biomass pellet. The results show that, the

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Rathi, Shweta, Rajesh Gupta, Pawan Labhasetwar, and Pranav Nagarnaik. "Challenges in calibration of water distribution network: a case study of Ramnagar Elevated Service Reservoir command area in Nagpur City, India." Water Supply 20, no. 4 (2020): 1294–312. http://dx.doi.org/10.2166/ws.2020.047.

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Abstract Calibration of a hydraulic model is a challenging task as it considers the involvement of a large number of uncertain parameters. There are some parameters like length and diameter of pipes, for which fairly accurate values can be obtained. As with all hydraulic models, water demands are one of the main parameters that cause the most uncertainty in the model outputs. The calibration of the water demands is usually not feasible, which is attributable to the limited quantity of available measurements in most real water networks. However, some parameters like nodal demands and pipe rough

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Terziev, Angel, Ivan Antonov, and Rositsa Velichkova. "Wind Data Analysis and Wind Flow Simulation Over Large Areas." Mathematical Modelling in Civil Engineering 10, no. 1 (2014): 38–45. http://dx.doi.org/10.2478/mmce-2014-0005.

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Abstract Increasing the share of renewable energy sources is one of the core policies of the European Union. This is because of the fact that this energy is essential in reducing the greenhouse gas emissions and securing energy supplies. Currently, the share of wind energy from all renewable energy sources is relatively low. The choice of location for a certain wind farm installation strongly depends on the wind potential. Therefore the accurate assessment of wind potential is extremely important. In the present paper an analysis is made on the impact of significant possible parameters on the

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Herzfeld, Ute C., Brian McDonald, Maciej Stachura, Robert Griffin Hale, Phillip Chen, and Thomas Trantow. "Bering Glacier surge 2011: analysis of laser altimeter data." Annals of Glaciology 54, no. 63 (2013): 158–70. http://dx.doi.org/10.3189/2013aog63a348.

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AbstractThe Bering Glacier–Bagley Icefield system in Alaska is currently surging (2011). Large-scale elevation changes and small-scale elevation-change characteristics are investigated to understand surge progression, especially mass transport from the pre-surge reservoir area to the receiving area and propagation of the kinematic surge wave as manifested in heavy crevassing characteristic of rapid, brittle deformation. This analysis is based on airborne laser altimeter data collected over Bering Glacier in September 2011. Results include the following: (1) Maximal crevasse depth is 60 m, reac

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Ali, Mohammad Mokaddes, Rowsanara Akhter, Md Abdul Alim, and Md Musa Miah. "Magnetic-Mixed Convection in Nanofluid-Filled Cavity Containing Baffles and Rotating Hollow-Cylinders with Roughness Components." Mathematical Problems in Engineering 2022 (December 14, 2022): 1–25. http://dx.doi.org/10.1155/2022/3044930.

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Mixed convective heat transfer in a nanofluid-filled lid-driven square cavity equipped with a rotating cylinder, horizontal baffles, and an external magnetic field is numerically examined in this study. A cylinder with triangular components is set at the centre of the cavity while two horizontal baffles are fixed to its vertical walls. The cavity is under the impact of the external magnetic field. Modified Maxwell’s model is taken into consideration to estimate the thermal conductivity of nanofluids. Galerkin FEM is applied to simulate nondimensional governing equations. The computations are c

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Кадацкая, М. М., В. А. Обязов, Т. А. Виноградова, and А. Ю. Виноградов. "ASSESSMENT OF ROUGHNESS COEFFICIENT VALUE." Гидросфера. Опасные процессы и явления 4, no. 1 (2020): 462–76. http://dx.doi.org/10.34753/hs.2019.1.4.462.

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В статье рассматривается один из основных параметров при проведении водохозяйственных расчетов коэффициент шероховатости. Оценка его величины до настоящего времени проводится по специальным таблицам или расчетным способом. Приведены различные методы расчета коэффициента шероховатости от оценки обратным путем по формуле Шези по результатам измерений до эмпирических зависимостей, полученных различными специалистами на основе натурных исследований. Кроме того, авторами рассмотрены формулы расчета коэффициента шероховатости на основании физических соображений. Результаты расчетов, полученных по та

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Behura, Aruna Kumar, Chinmaya Prasad Mohanty, Manas Ranjan Singh, Ashwini Kumar, Emanoil Linul, and Dipen Kumar Rajak. "Performance Analysis of Three Side Roughened Solar Air Heater: A Preliminary Investigation." Materials 15, no. 7 (2022): 2541. http://dx.doi.org/10.3390/ma15072541.

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In recent years, sunlight has been used in several fields such as photovoltaic cells, flat plate collectors, solar cookers, green buildings, and agricultural applications. Improved thermal performance has been seen which comes of three sides absorber plate with glass cover compared to the traditional one. This paper presents the Nusselt (Nu) number, collector efficiency factor (CEF), and collector heat removal factor (CHRF) for the optimal solution of three sides artificially roughened solar air heater. Five input variables such as Reynolds (Re) number, relative roughness pitch, relative rough

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Khaddor, Iliasse, Mohammed Achab, Abdelkader Ben jbara, and Adil Hafidi Alaoui. "Estimation of Peak Discharge in a Poorly Gauged Catchment Based on a Specified Hyetograph Model and Geomorphological Parameters: Case Study for the 23–24 October 2008 Flood, KALAYA Basin, Tangier, Morocco." Hydrology 6, no. 1 (2019): 10. http://dx.doi.org/10.3390/hydrology6010010.

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The determination of discharge from stage measurement is an essential procedure in surface hydrology. Due to limited data availability in terms of discharges and rainfalls, a number of non-flood water levels have been used for deriving a rating curve based on an indirect method with specific cross-sections, longitudinal slope of the river, and bed roughness at the KALAYA gage station. In addition, instantaneous rainfall recordings across the Meloussa gage station are available from 23 October 2008 storm event that have been collected in order to develop temporal distribution (hyetograph). Ther

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Fieman, Dina M., Mikaël Attal, and Stephen Addy. "Geomorphic response of a mountain gravel-bed river to an extreme flood in Aberdeenshire, Scotland." Scottish Journal of Geology 56, no. 2 (2020): 101–16. http://dx.doi.org/10.1144/sjg2019-005.

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This study uses the 2015 ‘Storm Frank’ flood on the River Dee, Aberdeenshire, to assess the impact of extreme events on river dynamics. The Storm Frank flood (>200 year recurrence interval) caused significant local morphological change that was concentrated in the middle portion of the 140 km long river and overall net degradation that primarily occurred through lateral adjustment processes. Although the flood did not cause widespread change in channel planform, morphological change at the reach scale (<1 km) was significant. Bank scour resulted in channel expansion and lateral migration

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Kumar, R. Rame. "Heat Transfer Analysis of Advanced Solar Collector." Indian Journal of Energy and Energy Resources 1, no. 4 (2022): 1–4. http://dx.doi.org/10.54105/ijeer.d1026.081422.

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A 2-dimensional CFD analysis has been carried out to study heat transfer and fluid flow behavior in a rectangular duct of a solar air heater with one roughened wall having circular and square rib roughness. The effect of Reynolds number and relative roughness pitch 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 Investigation has been carried out in medium Reynolds number flow (Re = 3800–18,000). It is found that the thermal

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R., Rame Kumar. "Heat Transfer Analysis of Advanced Solar Collector." Indian Journal of Energy and Energy Resources (IJEER) 1, no. 4 (2022): 1–4. https://doi.org/10.54105/ijeer.D1026.081422.

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<strong>Abstract: </strong>A 2-dimensional CFD analysis has been carried out to study heat transfer and fluid flow behavior in a rectangular duct of a solar air heater with one roughened wall having circular and square rib roughness. The effect of Reynolds number and relative roughness pitch 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 Investigation has been carried out in medium Reynolds number flow (Re = 3800–18,0

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Jin, Jie, Youngbeen Chung, Wanseung Kim, et al. "Classification of Bladder Emptying Patterns by LSTM Neural Network Trained Using Acoustic Signatures." Sensors 21, no. 16 (2021): 5328. http://dx.doi.org/10.3390/s21165328.

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(1) Background: Non-invasive uroflowmetry is used in clinical practice for diagnosing lower urinary tract symptoms (LUTS) and the health status of a patient. To establish a smart system for measuring the flowrate during urination without any temporospatial constraints for patients with a urinary disorder, the acoustic signatures from the uroflow of patients being treated for LUTS at a tertiary hospital were utilized. (2) Methods: Uroflowmetry data were collected for construction and verification of a long short-term memory (LSTM) deep-learning algorithm. The initial sample size comprised 34 pa

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Singh, Jasjeevan, and Harpuneet Singh. "A Review on Solar Air Heater using Various Roughness Geometries on Roughened Duct to Increase Heat Transfer Coefficient and Friction Characteristics." International Journal of Advance Research and Innovation 6, no. 4 (2018): 159–67. http://dx.doi.org/10.51976/ijari.641820.

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Heat transfer coefficient between absorber surface of collector and fluid i.e. air can be improved by providing artificial roughness on the absorber surface. In this way the Thermal efficiency is increased. Due to roughness geometry pumping power of solar collector is increased due to friction losses in the duct. So, it is necessary to take into account size, shape and flow pattern of various roughness elements to increase maximum efficiency with minimum frictional losses. Various artificial roughness geometries have been reported in the literature by investigators, for determining the effect

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Lenhart, Brian, Michael Zuraw, and William Earl Mustain. "(Invited) Experimental and Data Analysis Platforms to Better Understand the Corrosion and Discharge of Powdered Zn." ECS Meeting Abstracts MA2023-01, no. 25 (2023): 1659. http://dx.doi.org/10.1149/ma2023-01251659mtgabs.

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Zinc anodes have been a cornerstone of many commercial and pre-commercial battery technologies including primary and secondary alkaline cells, Zn-air batteries and Zn-ion batteries. To maximize the performance of devices at both the lab and commercial scales, moderate surface area (mm-sized) Zn powder is used – either immobilized onto a diffusion electrode or incorporated into a slurry. Unlike nano-sized materials, micron-sized materials are poorly characterized by traditional electrochemical techniques like thin-film rotating disk electrodes, because the roughness introduced by the relatively

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Bahuguna, Rahul, Sunil Chamoli, Yogesh Barthwal, Sumit Rana, Ashutosh Gupta, and Vijay Singh Bisht. "Economic analysis of artificially roughened solar air heater with v-shaped ribs." Acta Innovations, no. 44 (May 22, 2022): 18–33. http://dx.doi.org/10.32933/actainnovations.44.2.

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Due to the minimal transfer of heat from absorber plate to moving air in the duct, solar air heaters have low performance. One of the procedures to augment the heat transfer by substantial amount is by utilizing artificial roughness, by which the performance can be improved considerably. In this study, an economic investigation of solar air heater embedded with artificial roughness is accomplished numerically employing v-shaped roughness, with the objective of optimising life cycle solar savings. The non-dimensional parameters of roughness, namely, angle of attack (α), roughness pitch (p/e) an

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Shakhmayeva, A. R., and E. Kazalieva. "APPLICATION OF SILICON CARBIDE SAND IN THE TECHNOLOGY OF PROCESSING THE REVERSE SIDE OF SILICON TRANSISTOR STRUCTURES." Steklo i Keramika, no. 18 (June 2023): 69–72. http://dx.doi.org/10.14489/glc.2023.06.pp.069-072.

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A method is proposed for processing the reverse side of silicon transistor structures before the metal deposition process and obtaining contact to the collector of the transistor being formed. The parameters of the surface roughness of the silicon surface treated with carbide–silicon sand are studied in order to improve the adhesive properties before spraying the contact to the collector region of the transistor.

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38

Mahdi, Mahmoud Maustafa, and Ameer Abed Gaddoa. "Outdoor Testing of a Zig-Zag Solar Air heater with and without Artificial Roughness on Absorber Plate." Journal of Engineering 25, no. 4 (2019): 1–17. http://dx.doi.org/10.31026/j.eng.2019.04.01.

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In this paper, thermal performance of a zig-zig solar air heater (ZZSAH) with and without using steel wire mesh on the absorber plate of the collector is experimentally investigated. The experimental work includes four inclination angles of the collector 20o, 30o, 45o, and 60o and four air mass flow rates of 0.03, 0.04, 0.06, and 0.08 kg/s under varieties of operating conditions of a geographic location of Baghdad. New correlation equations of Nusselt number are obtained from experimental results for both types of collectors where the effect of varying of the inclination angle of collector tak

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Kumar, Khushmeet, Sushil Kumar, Deoraj Prajapati, Sushant Samir, Sashank Thapa, and Raj Kumar. "Solar Thermal Collector Roughened with S-Shaped Ribs: Parametric Optimization Using AHP-MABAC Technique." Fluids 10, no. 3 (2025): 67. https://doi.org/10.3390/fluids10030067.

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The current examination used a multi-criteria decision-making (MCDM) approach to optimize the roughness parameters of S-shaped ribs (SSRs) in a solar thermal collector (STC) duct using air as the working fluid. Different SSRs were tested to identify the combination of parameters resulting in the best performance. Geometrical parameters such as relative roughness pitch (PR/eRH) varied from 4 to 12, relative roughness height (eRH/Dhd) from 0.022 to 0.054, arc angle (αArc) from 30° to 75°, and relative roughness width (WDuct/wRS) from 1 to 4. The Nusselt number (NuRP) and friction factor (fRP), f

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Mohd. Amirul Hilmi Mohd Hanoin, Nor Amirah Safiah Muhamad, Nadzirah Mohd Mokhtar, Amir Abdul Razak, and Muhamad Sukri Hadi. "Effect Of Design Parameters of Serpentine-Shaped Flat Plate Solar Collector Under Malaysia Climate Conditions." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 88, no. 1 (2021): 71–80. http://dx.doi.org/10.37934/arfmts.88.1.7180.

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Solar thermal energy plays a vital role in the industrial sector, especially for water heating applications. Further research to improve the efficiency of flat plate solar collectors by focusing on collector design modification is imperative. This research aimed to carry out an experimental investigation on comparative designs and fabrication approaches that deal with the analysis of flat plate solar collector thermal performance, thermal efficiency, the effect of various mass flow rates, and pressure drop analyses. In this paper, a different design modification of pipe collector with serpenti

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Uysal, T. "Optimization of shape factor by the response surface method, and the effect on sphalerite flotation recovery." Journal of the Southern African Institute of Mining and Metallurgy 123, no. 9 (2023): 445–50. http://dx.doi.org/10.17159/2411-9717/2645/2023.

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Various morphological parameters that affect the flotation recovery of sphalerite were modelled and optimized using the response surface method (RSM). The effects of roughness value, shape factor, and collector concentration were investigated using the central composite full design method. The results were evaluated by analysis of variance. The optimum roughening time was found to be 25 minutes, the optimum roughness value was 2.9071 um, and the optimum collector concentration was 0.001 M. Using these values, a flotation recovery of 98.01% was obtained. Similarly, in shape factor studies, the

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Grachev, Andrey A., Christopher W. Fairall, Byron W. Blomquist, et al. "A Hybrid Bulk Algorithm to Predict Turbulent Fluxes over Dry and Wet Bare Soils." Journal of Applied Meteorology and Climatology 61, no. 4 (2022): 393–414. http://dx.doi.org/10.1175/jamc-d-20-0232.1.

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Abstract Measurements made in the Columbia River basin (Oregon) in an area of irregular terrain during the second Wind Forecast Improvement Project (WFIP2) field campaign are used to develop an optimized hybrid bulk algorithm to predict the surface turbulent fluxes from readily measured or modeled quantities over dry and wet bare or lightly vegetated soil surfaces. The hybrid (synthetic) algorithm combines (i) an aerodynamic method for turbulent flow, which is based on the transfer coefficients (drag coefficient and Stanton number), roughness lengths, and Monin–Obukhov similarity; and (ii) a m

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Fieuzal, Rémy, and Frédéric Baup. "Estimation of Multi-Frequency, Multi-Incidence and Multi-Polarization Backscattering Coefficients over Bare Agricultural Soil Using Statistical Algorithms." Applied Sciences 13, no. 8 (2023): 4893. http://dx.doi.org/10.3390/app13084893.

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In the last decade, many SAR missions have been launched to reinforce the all-weather observation capacity of the Earth. The precise modeling of radar signals becomes crucial in order to translate them into essential biophysical parameters for the management of natural resources (water, biomass and energy). The objective of this study was to demonstrate the capabilities of two statistical algorithms (i.e., multiple linear regression (MLR) and random forest (RF)) to accurately simulate the backscattering coefficients observed over bare agricultural soil surfaces. This study was based on satelli

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Amarnath., K., Gopal. P. Dr., M. Sridharan., and T. Senthil Kumar Dr. "Performance Improvement Analysis and Simulation of Solar PV T Water Collector." International Journal of Trend in Scientific Research and Development 2, no. 4 (2018): 960–65. https://doi.org/10.31142/ijtsrd14201.

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The objective of this paper is to review the collection of literature available on the Photo Voltaic and Thermal Solar Collector. The review paper is presented to show the comparison of findings obtained by various research works. In solar collector, the solar energy from the sun is converted in to electrical energy by means of Photo Voltaic panel and thermal energy by converting cold water into hot water. Nowadays, solar collector is preferred in many industries and house hold applications to reduce the demand of electricity by increasing the effective utilization of solar energy coming from

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Li, Mingchun, Guanci Chen, Wenbin Zhang, Yunfeng Peng, Shuntao Cao, and Jiakuan He. "Simulation Study of a New Magnetorheological Polishing Fluid Collector Based on Air Seal." Applied Sciences 12, no. 15 (2022): 7433. http://dx.doi.org/10.3390/app12157433.

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Inverted magnetorheological (MR) polishing device mainly use a magnetic sealing ring to collect polishing fluid. This collection method wears the wheel surface of the polishing wheel, affects the surface accuracy of the polishing wheel, and introduces machining error. In order to reduce this wear and improve recovery efficiency, a new type of collector using an air seal is proposed in this paper. Furthermore, testing method using six factors and a three-level orthogonal test table is used to study the structural parameters of the new collector. The flow fields affected by the different structu

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Watanabe, Tsutomu, Keiichi Goto, and Shintaro Minoura. "Investigation of Load Environment and Bending Load Capacities of Aged Prestressed Concrete Sleepers." Applied Sciences 13, no. 13 (2023): 7828. http://dx.doi.org/10.3390/app13137828.

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In this study, field measurements of the bending moments of prestressed concrete (PC) sleepers installed on commercial lines were obtained, and numerical analyses to identify the effects of different parameters on their bending moments were conducted. The bending load capacities of aged PC sleepers collected from commercial lines via bending tests were also determined. According to the field measurement results of the wheel loads and bending moments of the PC sleepers, the measured values were smaller than the design values. In addition, neither the wheel load nor the bending moment depended o

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De Blasiis, Maria Rosaria, Alessandro Di Benedetto, and Margherita Fiani. "Mobile Laser Scanning Data for the Evaluation of Pavement Surface Distress." Remote Sensing 12, no. 6 (2020): 942. http://dx.doi.org/10.3390/rs12060942.

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The surface conditions of road pavements, including the occurrence and severity of distresses present on the surface, are an important indicator of pavement performance. Periodic monitoring and condition assessment is an essential requirement for the safety of vehicles moving on that road and the wellbeing of people. The traditional characterization of the different types of distress often involves complex activities, sometimes inefficient and risky, as they interfere with road traffic. The mobile laser systems (MLS) are now widely used to acquire detailed information about the road surface in

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Eisen, Olaf, Anna Winter, Daniel Steinhage, Thomas Kleiner, and Angelika Humbert. "Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state." Annals of Glaciology 61, no. 81 (2020): 162–75. http://dx.doi.org/10.1017/aog.2020.47.

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AbstractBasal motion of ice sheets depends in part on the roughness and material properties of the subglacial bed and the occurrence of water. To date, basal motion represents one of the largest uncertainties in ice-flow models. It is that component of the total flow velocity that can change most rapidly and can, therefore, facilitate rapid variations in dynamic behaviour. In this study, we investigate the subglacial properties of the East Antarctic Ice Sheet by statistically analysing the roughness of the bed topography, inferred from radio-echo sounding measurements. We analyse two sets of r

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Mansanarez, Valentin, Ida K. Westerberg, Steve W. Lyon, and Norris Lam. "Estimating uncertainties in hydraulicallymodelled rating curves for discharge time series assessment." E3S Web of Conferences 40 (2018): 06013. http://dx.doi.org/10.1051/e3sconf/20184006013.

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Establishing a reliable stage-discharge (SD) rating curve for calculating discharge at a hydrological gauging station normally takes years of data collection. Estimation of high flows is particularly difficult as they occur rarely and are often difficult to gauge in practice. At a minimum, hydraulicallymodelled rating curves could be derived with as few as two concurrent SD and water-surface slope measurements at different flow conditions. This means that a reliable rating curve can, potentially, be developed much faster via hydraulic modelling than using a traditional rating curve approach ba

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Nourmohammadi, Khosrow, P. K. Hopke, and J. J. Stukel. "Turbulent Air Flow Over Rough Surfaces: II. Turbulent Flow Parameters." Journal of Fluids Engineering 107, no. 1 (1985): 55–60. http://dx.doi.org/10.1115/1.3242440.

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The objective of the present study was to examine experimentally the turbulent flow structure in a repeated rib geometry rough wall surface as a function of the ratio of the roughness height to the pipe diameter (K/D), the ratio of the spacing between the elements to the roughness height (P/K), the axial position within a rib cycle, and the Reynolds number. For small P/K values, the turbulent intensities and Reynolds shear stress variations were similar to those found for smooth wall pipe flow. Unique relationships for the u′ and v′ were found that were valid in the outer layer of the flow for

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