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Journal articles on the topic 'Trapezoidal Channel'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Hao, Hongwei, Mengdong Chen, Wei Kang, Zhanfeng Deng, and Hangyin Mao. "Effect of flow channel cross-section shape on the performance of proton exchange membrane electrolysis cell." Journal of Physics: Conference Series 2728, no. 1 (2024): 012028. http://dx.doi.org/10.1088/1742-6596/2728/1/012028.

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Abstract To study the thermal and mass distribution in proton exchange membrane electrolytic cells (PEMEC), a two-phase numerical model of a single-channel electrolytic cell was established. The polarization performance and gas-heat distribution in a single-channel electrolytic cell under five different flow channel cross-sections (rectangle, trapezoid, inverted trapezoid, triangle, and circle) were studied. The findings indicate that the inverted trapezoidal flow channel’s gas buildup effect is rather severe in both the catalytic and diffusion layers. In the trapezoidal flow channel, the temp

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Abed, Azher M., Doaa Fadhil Kareem, Hasan Sh Majdi, and Ammar Abdulkadhim. "Experimental and CFD Analysis of Two-Phase Forced Convection Flow in Channels of Various Rib Shapes." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 77, no. 1 (2020): 36–50. http://dx.doi.org/10.37934/arfmts.77.1.3650.

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This paper investigates numerically and experimentally heat transfer forced convective two-phase flow (i.e. air and water) over a rectangular ribbed channel with a vertical orientation. Three distinct rib–groove shapes have been examined. Ribs - groove shapes are; Triangle, Trapezoid, and Semi-Trapezoid ribs-groove. The present study has been performed with continuous heat flux through range of water and air superficial inlet velocity values between 0.105 – 0.316m/s, and 0.263 – 1.320 m/s, respectively. Continuity, momentum and energy calculations have been formulated using the Finite Volume A

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3

Hager, Willi H. "Trapezoidal side-channel spillways." Canadian Journal of Civil Engineering 12, no. 4 (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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4

Li, Song, Jiangbo Wu, Xiaoze Du, Haonan Dong, and Zhibin Yu. "Study on heat transfer characteristics of supercritical co2 printed circuit heat exchangers with different shape channels." Thermal Science, no. 00 (2024): 157. http://dx.doi.org/10.2298/tsci240110157l.

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Printed circuit heat exchanger (PCHE) is a microchannel heat exchanger. Because of its high efficiency, high pressure and high temperature resistance, it has been widely used in photovoltaic power generation, nuclear energy and other fields. In particular, the research on the cross section shape of heat exchanger channel has been widely concerned by researchers. In this paper, the PCHE performance of semi-circular, square and trapezoidal channels with the same inlet and outlet area is compared under the pressure of 8MPa. The heat transfer performance of the mass flow rate in the range of 500-2

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Jessanne, Y. Lichtenberg, Ling Yue, and Kim Seunghyun. "Numerical Analysis of a Trapezoidal Microchannel for Hydrodynamic Detachment of Cells." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 4 (2020): 1473–77. https://doi.org/10.35940/ijeat.D7454.049420.

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Hydrodynamic shear force along the bottom microchannel wall has been utilized in cell adhesion studies to detach cells in microfluidic channels. Due to the small dimensions of microfluidic channels, the shear stress produced in a conventional microchannel is dependent mainly on the fluid velocity and channel height. The wall shear force magnitude increases as the channel height is reduced. However, a reduced channel height decreases the sample volume to be contained in the fluidic channel and also increases the pressure drop significantly which may fail the fluidic device. In this study, a nov

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Azma, Aliasghar, and Yongxiang Zhang. "Tributary Channel Width Effect on the Flow Behavior in Trapezoidal and Rectangular Channel Confluences." Processes 8, no. 11 (2020): 1344. http://dx.doi.org/10.3390/pr8111344.

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Channel confluences happen commonly in water transport networks and natural rivers. Utilizing a 3D CFD code, a series of numerical simulations were performed using a large eddy simulation turbulence model to investigate the effect of the variations in tributary channel width and the transverse geometrical shape of the main channel on the flow parameters and vertical structure in a T-shape confluence. The code was calibrated using the experimental data from the literature. Flow parameters were considered in ratios of tributary width to the main channel width in trapezoidal and rectangular chann

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7

Niazkar, Majid. "Assessment of artificial intelligence models for calculating optimum properties of lined channels." Journal of Hydroinformatics 22, no. 5 (2020): 1410–23. http://dx.doi.org/10.2166/hydro.2020.050.

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Abstract Lined channels with trapezoidal, rectangular and triangular sections are the most common manmade canals in practice. Since the construction cost plays a key role in water conveyance projects, it has been considered as the prominent factor in optimum channel designs. In this study, artificial neural networks (ANN) and genetic programming (GP) are used to determine optimum channel geometries for trapezoidal-family cross sections. For this purpose, the problem statement is treated as an optimization problem whose objective function and constraint are earthwork and lining costs and Mannin

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8

Puteri Nadia Shafiqah Harmizi, Siti Aimi Asyarah Zakaria, Iskandar Shah Mohd Zawawi, and Mohd Ridza Mohd Haniffah. "Numerical Analysis on the Flow Depth Behaviour in Dividing Open-Channel for Trapezoidal and Rectangular Cross-Sectional Channel." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 108, no. 2 (2023): 98–109. http://dx.doi.org/10.37934/arfmts.108.2.98109.

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Open-channel with dividing flow refers to any side water withdrawals from streams, rivers or main channel. It has become an important issue, especially when measuring the flow rate and depth of water as part of environmental management schemes and many practical projects such as the system of irrigation and drainage, water and wastewater treatment plants and other water resources projects. Although the behaviour of water flow has been studied by the previous researchers, most studies have only been carried out in simulation and lab experiment for a straight prismatic main channel. The mathemat

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9

Aswini, Kilaru, Manjunatha, S. Zafar, Ashish Parmar, Niti Sharma, and Hassan M. Al-Jawahry. "Improving Hydraulic Performance of Drip Irrigation Emitters Through CFD Analysis." E3S Web of Conferences 507 (2024): 01068. http://dx.doi.org/10.1051/e3sconf/202450701068.

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A drip irrigation system delicately nourishes plant roots by gently delivering water drop by drop, ensuring minimal water loss due to runoff or evaporation. This method allows soil particles ample time to absorb and retain the water, promoting optimal plant hydration. To enhance the efficiency of drip irrigation, a mesmerizingly detailed 3D solid model of a drip emitter was meticulously crafted using cutting-edge SolidWorks software, revolutionizing the irrigation system's performance. CFD simulation technique is used to understanding the internal flow behavior and optimum pressure inside the

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Hager, Willi H. "Modified, Trapezoidal Venturi Channel." Journal of Irrigation and Drainage Engineering 112, no. 3 (1986): 225–41. http://dx.doi.org/10.1061/(asce)0733-9437(1986)112:3(225).

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11

Liu, Lei, Aihua Yan, Qiuxiang Shi, Xi Xiao, Chenbing Zhu, and Xuelong Yang. "Numerical Study on Thermal-Hydraulic Performance of Printed Circuit Heat Exchangers during Natural Gas Trans-Critical Liquefaction." Atmosphere 13, no. 5 (2022): 730. http://dx.doi.org/10.3390/atmos13050730.

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Printed Circuit Heat Exchangers (PCHEs) are considered an excellent alternative for the main cryogenic heat exchanger of Floating Liquefied Natural Gas (FLNG) facilities due to their compact structure and strong heat transfer performance. However, it is unclear how to configure the geometry of the PCHE channels to achieve its optimal performance in the trans-critical liquefaction process of natural gas (NG), which is critical for the main heat exchanger. In this paper, we numerically studied the thermal-hydraulic characteristics of PCHEs with different channel types under the specified conditi

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Hameed, Ayman T. "Optimal Design of Round Bottomed Triangle Channels." Tikrit Journal of Engineering Sciences 17, no. 3 (2010): 31–43. http://dx.doi.org/10.25130/tjes.17.3.04.

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In optimal design concept, the geometric dimensions of a channel cross-section are determined in a manner to minimize the total construction costs. The Direct search optimization method by using MATALAB is used to solve the resulting channel optimization models for a specified flow rate, roughness coefficient and longitudinal slope. The developed optimization models are applied to design the round bottomed triangle channel and trapezoidal channels to convey a given design flow considering various design scenarios However, it also can be extended to other shapes of channels. This method optimiz

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khata, Naseer Dawood, Zena Khalefa Kadim, and Kamil Abdulhussein Khalaf. "Numerical Study of Heat Transfer Enhancement in Contour Corrugated Channel Using Water and Engine Oil." CFD Letters 12, no. 12 (2020): 17–37. http://dx.doi.org/10.37934/cfdl.12.12.1737.

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Improving the design of geometrical parameters of heat exchanger leads to enhance heat transfer and makes it further compacted which in turn increases the efficiency of the thermal process, leading to save operating costs. In the present investigation, thermal and hydraulic performance of laminar flow of the trapezoidal, sinusoidal, and straight counter heat exchanger with water and engine oil was carried out numerically over Reynolds number ranges of 1100-2300 for water and 250 for engine oil. The effect of wave height and wavelength of both trapezoidal and sinusoidal on the thermal propertie

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14

Song, Hui, Shuangxiu Fan, and Dayi Qu. "Experimental Study on Flow and Heat Transfer Characteristics in the Circular-Arc-Shaped Flow Channel." Applied Sciences 12, no. 1 (2021): 376. http://dx.doi.org/10.3390/app12010376.

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Different parameters of the circular-arc, trapezoidal and equal cross-section-shaped flow channels were analyzed, and the core volume goodness factor was used for the comparison of the three different types of flow channels. During the experiment, the Reynolds number (Re) on the air side ranged from 1200 to 5100. The results showed that the overall heat transfer performance of the three channels in this paper are circular-arc, trapezoidal and equal cross-section in order from good to bad. The overall heat transfer enhancement performance of the circular-arc flow channel is the best, which is 9

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15

Koolivand, Abdollah, and Panagiotis Dimitrakopoulos. "Motion of an Elastic Capsule in a Trapezoidal Microchannel under Stokes Flow Conditions." Polymers 12, no. 5 (2020): 1144. http://dx.doi.org/10.3390/polym12051144.

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Even though the research interest in the last decades has been mainly focused on the capsule dynamics in cylindrical or rectangular ducts, channels with asymmetric cross-sections may also be desirable especially for capsule migration and sorting. Therefore, in the present study we investigate computationally the motion of an elastic spherical capsule in an isosceles trapezoidal microchannel at low and moderate flow rates under the Stokes regime. The steady-state capsule location is quite close to the location where the single-phase velocity of the surrounding fluid is maximized. Owing to the a

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16

Kacimov, A. R. "Seepage Optimization for Trapezoidal Channel." Journal of Irrigation and Drainage Engineering 118, no. 4 (1992): 520–26. http://dx.doi.org/10.1061/(asce)0733-9437(1992)118:4(520).

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17

Wanoschek, Robert, and Willi H. Hager. "Hydraulic jump in trapezoidal channel." Journal of Hydraulic Research 27, no. 3 (1989): 429–46. http://dx.doi.org/10.1080/00221688909499175.

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18

Syarif, Muhammad, Andi Rumpang Yusuf, and Burhanuddin Badrun. "Analisis Kecepatan Aliran Pada Penampang Saluran Segi Empat Dan Trapesium Di Saluran Induk Bantimurung Kabupaten Maros." Jurnal Penelitian Teknik Sipil Konsolidasi 1, no. 2 (2023): 107–11. http://dx.doi.org/10.56326/jptsk.v1i2.3025.

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This study aims to determine the distribution of flow velocity and analyze differences in flow velocity in the rectangular and trapezoidal channels in the Bantimurung main channel, Maros Regency. The research method used is starting from making observations in the field related to the selection of research sites and then collecting data at the selected locations in the field with each sample in each channel. Furthermore, case studies or literature studies from various literature books related to the distribution of flow velocity, and analyzing the comparison of flow rates and how to calculate

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19

Shahari, Nor Azni, Nor Arif Husaini Norwaza, Iskandar Shah Mohd Zawawi, Nurisha Adrina Mohd Kamarul, and Aimi Said. "Numerical investigation on the behavior of combining open-channel flow." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 2 (2021): 1110. http://dx.doi.org/10.11591/ijeecs.v23.i2.pp1110-1119.

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Open-channel flow is known as fluid flow with an open atmospheric surface. It has become an important issue especially when measuring the flow rate and depth of water as part of environmental management schemes. Many efforts have been made by the previous researchers to investigate the behavior of water flow. However, most studies on water flow have only been carried out in a straight prismatic main channel, either in a trapezoidal and rectangular type of channel section with lateral branch of angle of 90<sup>o</sup>. In this study, the general equations of combining open-channel f

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20

Shahari, Nor Azni, Nor Arif Husaini Norwaza, Iskandar Shah Mohd Zawawi, Nurisha Adrina Mohd Kamarul, and Aimi Said. "Numerical investigation on the behavior of combining open-channel flow." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 2 (2021): 1110–19. https://doi.org/10.11591/ijeecs.v23.i2.pp1110-1119.

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Open-channel flow is known as fluid flow with an open atmospheric surface. It has become an important issue especially when measuring the flow rate and depth of water as part of environmental management schemes. Many efforts have been made by the previous researchers to investigate the behavior of water flow. However, most studies on water flow have only been carried out in a straight prismatic main channel, either in a trapezoidal and rectangular type of channel section with lateral branch of angle of 90o . In this study, the general equations of combining open-channel flow for trapezoidal an

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21

Elshaarawy, Mohamed Kamel, and Nanes Hassanin Elmasry. "Experimental and Numerical Modeling of Seepage in Trapezoidal Channels." Knowledge-Based Engineering and Sciences 5, no. 3 (2024): 43–60. https://doi.org/10.51526/kbes.2024.5.3.43-60.

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Accurately estimating seepage losses from unlined and lined trapezoidal channels is essential for effective water management, especially in water-scarce regions. This study combined experimental and numerical approaches to evaluate seepage losses, focusing on the influence of channel geometry and liner properties, including hydraulic conductivity (KL) and thickness (tL). Firstly, a physical model was constructed, the materials were prepared, and testing procedures were performed to estimate the hydraulic conductivity of the soil and cement mixture. Secondly, five-channel geometries were adjust

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22

Shen, Xiang Dong, and Yu Pei Zhang. "Cold Trapezoidal Channel Composite Lining Structure Force Analysis and Failure Criteria." Advanced Materials Research 655-657 (January 2013): 1853–56. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.1853.

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Water conservancy project in the northern cold regions, most of the channel lining structure using polystyrene board plus the compound in the form of precast concrete panels, due to the lack of convenient and practical theoretical model for the guidance of the composite channel lining alone experience and experimental data the size of its structure, the actual cold water channels and the climate and environment in which concrete composite lining water channels necessary assumptions, the use of the theory of the mechanics of composite materials, concrete structures and other composite channel l

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23

Gautam, Naayan Prasad. "Hydrological Modeling of Extreme Rainfall Events in the Gandaki River Basin Using HEC-HMS." Geographical Journal of Nepal 18, no. 1 (2025): 157–74. https://doi.org/10.3126/gjn.v18i1.77067.

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Hydrological modeling is categorized into lumped, semi-distributed, and distributed models, and with the semi-distributed model dividing a basin into sub-basins to estimate runoff and compute stream flow at the outlet. This study applies the semi-distributed HEC-HMS model to assess the impact of channel geometry on hydrological modeling in the Narayani River Basin, Nepal. Different channel geometries were simulated to analyze their effects on stream flow. Results indicate that the trapezoidal channel section provides the most accurate representation, closely matching observed discharge. The mo

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Cheng, Yong, Yude Song, Chunye Liu, Wene Wang, and Xiaotao Hu. "Numerical Simulation Research on the Diversion Characteristics of a Trapezoidal Channel." Water 14, no. 17 (2022): 2706. http://dx.doi.org/10.3390/w14172706.

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Open-channel bifurcations are the most common water diversion structures in irrigation districts. In irrigation water conveyance, water transport efficiency and sedimentation are primary concerns. This study accordingly analyzes the influence of open-channel bifurcations on water delivery in irrigation areas. Herein, the three-dimensional flow at an open-channel bifurcation was studied via numerical simulations using FLOW-3D software and including 15 sets of working conditions. The hydraulic characteristics of the recirculation zone and flow structures in the vicinity of the open-channel bifur

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SAYAN, Yunus. "INVESTIGATION OF THE EFFECT OF A DIFFERENT TRAPEZOIDAL INCLINATION ANGLE IN A REVERSE TRAPEZOIDAL CROSS-SECTION FLOW CHANNEL ON THE PERFORMANCE OF THE PEM FUEL CELL WITH THE COMPUTATIONAL FLUID DYNAMIC (CFD) METHOD." Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi 26, no. 2 (2023): 408–23. http://dx.doi.org/10.17780/ksujes.1180483.

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In this work, a reverse trapezoidal cross-section channel shape for a single flow channel PEM fuel cell was examined with computational fluid dynamic (CFD) method. ANSYS Fluent was applied to solve electrochemical reactions, potential fields, mass, species, and energy transport equations. Species mass ratio, temperature distribution and relative humidity were obtained for the cell as well as the i-V and power density plots. The results were compared to two reference geometries with the commonly used square section shape for the channel. One reference geometry has the same channel width and hei

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Xi, Lei, Yuan Gao, Qicheng Ruan, Jianmin Gao, Liang Xu, and Yunlong Li. "Numerical Study on Steam Cooling Characteristics in a Isosceles Trapezoidal Channel with Pin-Fin Arrays at Turbine Blade Trailing Edge." Energies 17, no. 11 (2024): 2482. http://dx.doi.org/10.3390/en17112482.

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Using the SST k-ω turbulence model, a comprehensive numerical investigation was conducted to analyze the flow and heat transfer characteristics of steam within an isosceles trapezoidal cooling channel with pin-fin arrays modeled from the trailing edge of a F-class gas turbine high-temperature blade. The influence laws of various parameters, including the Reynolds number (Re, from 10,000 to 50,000), dimensionless pin-fin diameter (d/H, from 0.4 to 0.8), and dimensionless pin-fin spacing (S/H, from 1.6 to 2.4), on the flow and heat transfer performance of the isosceles trapezoidal cooling channe

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Munadi, Munadi, Moh Shaefur Rokhman, Dian Nataria Oktaviani, Ahmadi Ahmadi, and Helmi Roichatul Jannah. "Matric Flux Potential in Time Independent Infiltration Problems from a Single Triangular and a Trapezoidal Irrigation Channel." JTAM (Jurnal Teori dan Aplikasi Matematika) 8, no. 1 (2024): 285. http://dx.doi.org/10.31764/jtam.v8i1.17033.

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In this paper, steady infiltration problems into a homogeneous soil from a single triangular and trapezoidal irrigation channel are considered. The governing equation is Richard's equation that represents the movement of water in unsaturated soil. It is a non-linear equation and can be solved by linearizing to become a modified Helmholtz equation. Dual Reciprocity Boundary Element Methods (DRBEM) are used in this study to numerically solve the modified Helmholtz equation. Therefore, by using a provided solution, the numerical Matric Flux Potential (MFP) is calculated. This method was applied t

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Saghebian, Seyed Mahdi, Daniel Dragomir-Stanciu, and Roghayeh Ghasempour. "Assessing the Capability of KELM Meta-Model Approach in Predicting the Energy Dissipation in Different Shapes Channels." Proceedings 63, no. 1 (2020): 45. http://dx.doi.org/10.3390/proceedings2020063045.

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For transition of a supercritical flow into a subcritical flow in an open channel, a hydraulic jump phenomenon is used. Different shaped channels are used as useful tools in the extra energy dissipation of the hydraulic jump. Accurate prediction of relative energy dissipation is important in designing hydraulic structures. The aim of this paper is to assess the capability of a Kernel extreme Learning Machine (KELM) meta-model approach in predicting the energy dissipation in different shaped channels (i.e., rectangular and trapezoidal channels). Different experimental data series were used to d

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Syahputra, Zulfan. "Perhitungan Dimensi Saluran Drainase Pada Daerah Persawahan Separi III dan IV Kabupaten Kutai Kartanegara." Kurva S : Jurnal Keilmuan dan Aplikasi Teknik Sipil 5, no. 3 (2017): 137. http://dx.doi.org/10.31293/teknikd.v4i2.2014.

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ABSTRACT The agricultural sector always get the attention and priority to each lamp carried out, an irrigated land needed careful planning of drainage on irrigated to prevent flooding or inundation on irrigated land.The development of irrigation network planning techniques require saluaran irrigation network which includes primary and secondary irrigation channels. The data used in planning is that the meteorological data of rainfall data, maps Contur, and data topogragrafi. The study provides the magnitude of channel dimensions trapezoidal return period of 2 years dngean dimensions W = 0.410

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Bakhshi, Hesam, Erfan Khodabandeh, Omidali Akbari, Davood Toghraie, Mohammad Joshaghani, and Alireza Rahbari. "Investigation of laminar fluid flow and heat transfer of nanofluid in trapezoidal microchannel with different aspect ratios." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 5 (2019): 1680–98. http://dx.doi.org/10.1108/hff-05-2018-0231.

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Purpose In the present study, laminar steady flow of nanofluid through a trapezoidal channel is studied by using of finite volume method. The main aim of this paper is to study the effect of changes in geometric parameters, including internal and external dimensions on the behavior of heat transfer and fluid flow. For each parameter, an optimum ratio will be presented. Design/methodology/approach The results showed that in a channel cell, changing any geometric parameter may affect the temperature and flow field, even though the volume of the channel is kept constant. For a relatively small hy

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Saghebian, Seyed Mahdi. "Predicting the relative energy dissipation of hydraulic jump in rough and smooth bed compound channels using SVM." Water Supply 19, no. 4 (2018): 1110–19. http://dx.doi.org/10.2166/ws.2018.162.

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Abstract Channels with different shapes and bed conditions are used as useful appurtenances to dissipate the extra energy of a hydraulic jump. Accurate prediction of hydraulic jump energy dissipation is important in design of hydraulic structures. In the current study, hydraulic jump energy dissipation was assessed in channels with different shapes and bed conditions (i.e. smooth and rough beds) using the support vector machine (SVM) as an intelligence approach. Five series of experimental datasets were applied to develop the models. The results showed that the SVM model is successful in estim

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Říha, Jaromír, and Zbyněk Zachoval. "Flow characteristics at trapezoidal broad-crested side weir." Journal of Hydrology and Hydromechanics 63, no. 2 (2015): 164–71. http://dx.doi.org/10.1515/johh-2015-0026.

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Abstract Broad-crested side weirs have been the subject of numerous hydraulic studies; however, the flow field at the weir crest and in front of the weir in the approach channel still has not been fully described. Also, the discharge coefficient of broad-crested side weirs, whether slightly inclined towards the stream or lateral, still has yet to be clearly determined. Experimental research was carried out to describe the flow characteristics at low Froude numbers in the approach flow channel for various combinations of in- and overflow discharges. Three side weir types with different oblique

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Achour, Bachir. "Computation of Normal Depth in Trapezoidal Open Channel Using the Rough Model Method." Advanced Materials Research 955-959 (June 2014): 3231–37. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.3231.

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The recurring problem of calculating the normal depth in a trapezoidal open channel is easily solved by the rough model method. The Darcy-Weisbach relationship is applied to a referential rough model whose friction factor is arbitrarily chosen. This leads to establish the non-dimensional normal depth relationship in the rough model. Through a non-dimensional correction factor of linear dimension, the aspect ratio and therefore normal depth in the studied channel is deduced. Keywords: Rough model method, Trapezoidal channel, Normal depth, Turbulent flow, Discharge, Energy slope.

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Su, Wei-Jie, and Yao-Hsien Liu. "Thermal Performance of V-Shaped and X-Shaped Ribs in Trapezoidal Cooling Channels." Energies 14, no. 16 (2021): 4826. http://dx.doi.org/10.3390/en14164826.

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Convective heat transfer enhancement using rib turbulators is effective for turbine blade internal cooling. Detailed heat transfer measurement of X-shaped ribs in a trapezoidal cooling channel was experimentally conducted using infrared thermography. The novel X-shaped ribs were designed by combining two V-shaped ribs, and more secondary flows generated by the X rib delivered higher heat transfer enhancement. The Reynolds numbers in this study were 10,000, 20,000, and 30,000. These ribs were installed on two opposite walls of a trapezoidal channel in a staggered arrangement. The rib pitch-to-h

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Nusantara, Danayanti Azmi Dewi. "Analisis Kapasitas Saluran Sistem Drainase di Simo Katrungan Kidul Sawahan Surabaya." Ge-STRAM: Jurnal Perencanaan dan Rekayasa Sipil 3, no. 1 (2020): 1. http://dx.doi.org/10.25139/jprs.v3i1.2338.

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Sawahan is a densely populated sub-district located in the city of Surabaya with a population density which until 2017 reached 215,024 people as a result of a wide and deep drainage channel which became narrow and shallow as more and more settlements developed. And when the rainy season comes, the drainage channel in the Banyu Urip (Simo Katrungan Kidul) area of Surabaya is unable to collect rainwater, causing water overflow in the drainage and flood channels. Heavy rain for more than 1.5 hours and hit Simokatrungan area can cause inundation up to 500 meters inundated. The deepest puddles reac

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Egorov, E. E., and S. B. Sokolov. "Elevation Wave Velocity in a Trapezoidal Channel." Power Technology and Engineering 50, no. 4 (2016): 361–64. http://dx.doi.org/10.1007/s10749-016-0713-8.

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kateb, Samir, Mahmoud Debabeche, and Ferhat Riguet. "Hydraulic Jump in a Sloped Trapezoidal Channel." Energy Procedia 74 (August 2015): 251–57. http://dx.doi.org/10.1016/j.egypro.2015.07.591.

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Lawal, A. Q., O. O. Adewumi, and O. T. Olakoyejo. "Numerical investigation of thermal performance of a combined heat sink with various microchannel shapes." Nigerian Journal of Technological Development 19, no. 2 (2022): 164–71. http://dx.doi.org/10.4314/njtd.v19i2.9.

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The influence of channel shape on a combined heat sink of three different channel forms is investigated numerically in this work. The channel shapes considered were the trapezoidal, inverse trapezoidal and hexagonal microchannel shapes. The goal of this study was to compare and identify the combined microchannel shape that performed best under conditions of high uniform heat flux. The thermal performance of the combined heat sink was assessed using two criteria: lowest maximum temperature and lowest temperature elevation on the bottom of the combined heat sink where heat is applied. The unifor

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Zhang, Guodong, Changjiang Wang, Shuzhan Bai, Guoxiang Li, Ke Sun, and Hao Cheng. "Improvement of Blocked Long-Straight Flow Channels in Proton Exchange Membrane Fuel Cells Using CFD Modeling, Artificial Neural Network, and Genetic Algorithm." Applied Sciences 14, no. 1 (2024): 428. http://dx.doi.org/10.3390/app14010428.

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To further improve the performance of the Proton Exchange Membrane Fuel Cell (PEMFC), in this paper, we designed a blocked flow channel with trapezoidal baffles, and geometric parameters of the baffle were optimized based on CFD simulation, Artificial Neural Network (ANN), and single-objective optimization methods. The analysis of velocity, pressure, and oxygen distribution in the cathode flow channel shows that the optimized trapezoidal baffle can improve oxygen transport during the reaction. The comparison of the optimization model with the straight flow channel model and the rectangular baf

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Kadirova, Mukaddas-Gaukhar. "Automatic partition structure for trapezoidal channels." E3S Web of Conferences 365 (2023): 03034. http://dx.doi.org/10.1051/e3sconf/202336503034.

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Based on the analysis of existing and proposed designs of automatic gate structures, as well as the design of an automatic water level regulator on the canal developed earlier with F.A.Kadirov, a design of a mobile automatic partition structure in the form of an automatic shutter for channels of a trapezoidal section of irrigation systems was developed. And also, based on model studies conducted by the author, the flow coefficient is determined, and a formula for determining the throughput of this design is given. This design is made in the form of a gate, which is a container formed by a rigi

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Busqué, Raquel, Matias Bossio, Albert Brigido, and Antoni Lara. "Effects of Different Channel Geometries of Metallic Bipolar Plates on Proton Exchange Membrane Fuel Cell Performance." Energies 16, no. 23 (2023): 7702. http://dx.doi.org/10.3390/en16237702.

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This paper investigates the effects of different channel geometries on the performance of Proton Exchange Membrane Fuel Cells (PEMFCs). The study employs computational fluid dynamics (CFD) coupled with thermal and electrochemical simulations to analyze five channel geometries (cases A to E) of bipolar plates. A thorough study on this topic is not found in the literature and aims to identify designs that optimize performance and align with cost-effective production methods. Among the various studied geometries, case D, featuring a trapezoidal cross-section, exhibited the most favorable performa

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Malik, Priyanka, R. S. Gupta, and Mridula Gupta. "Linearity Analysis of GME-TRC MOSFET Using SiO₂ as a Gate Insulator at High Temperature." Advanced Materials Research 685 (April 2013): 207–10. http://dx.doi.org/10.4028/www.scientific.net/amr.685.207.

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This paper analysis the impact of temperature variation on gate material engineered trapezoidal recessed channel (GME-TRC) MOSFET and trapezoidal recessed channel (TRC) MOSFET, using ATLAS: 3D device simulator [. The study focuses on the linearity and analog performance comparison of GME-TRC and TRC MOSFETs and the impact of temperature variations on some of the key parameters like drain current, transconductance and the optimum bias point in terms of gm3 (third order derivative of Ids-Vgs) and VIP3 has been analysed.

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Sulistyono, Bambang Agus, and Suryo Widodo. "Preissmann Four-Point Methods for Solution of Simplified Saint-Venant Equations Applied to Flood Routing in Prismatic Open Channels." Science and Technology Indonesia 9, no. 1 (2024): 183–88. http://dx.doi.org/10.26554/sti.2024.9.1.183-188.

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This research goal to compare the flow properties in the rectangular and trapezoidal open channels by examining the influence of the channel side slope is depicted by simplified Saint Venant Equations. The solution of these equations has been completed numerically by using Preissmann four-point scheme. The model is simulated using the Matlab application to point out the flow properties. The proposed model is validated by the model without simplification which was selected from the literature. The validation outcomes indicate that in common, the simulation outcomes of the two models have a good

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Gunawan, Risal, Rika Ernawati, and Tedy Agung Cahyadi. "Planning for Normalization of the Apu River in the Post-Mining Area." Journal of Earth and Marine Technology (JEMT) 5, no. 1 (2024): 8–19. https://doi.org/10.31284/j.jemt.2024.v5i1.6432.

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Miners often leave traces such as irregular river channels, holes in the mining area without repair measures, the mining area is located in Boyolali Regency, precisely in the Apu River area. Apu River is one of the centers of Merapi sand mining which is quite large, mining activities have the potential to cause river overflows. For this reason, improvements need to be made. This study aims to plan a post-mining model in a river that has changed, the method in this study is to take water discharge directly with 5 sampling points and analyze the distribution of gumbell rainfall for 10 years and

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Kadirova, Mukaddas-Gaukhar. "Automatic water level regulator with flexible working bodies in form of partition structure for trapezoidal channels." E3S Web of Conferences 401 (2023): 01021. http://dx.doi.org/10.1051/e3sconf/202340101021.

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To improve the designs of hydraulic automatic water level regulators with flexible working bodies for channels, the object of research was developing and studying an innovative design of an autoregulator of the water level with flexible working bodies in the form of a partition structure for trapezoidal channels. The study℉s main purpose was to create a design for trapezoidal channels that do not allow channel narrowing and provides automatic level control, draining excess water, washing deposits in front of the partition, and determining its throughput. The developed design consists of a gate

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Nedelcu, Dragoş Iulian, Iulian Florescu, and Petru Gabriel Puiu. "The Simulative Analysis of the Fluid Parameters in Zone of Apparition of the Hydraulic Jump in the Penstock Placed on the Open Channels." Applied Mechanics and Materials 809-810 (November 2015): 968–73. http://dx.doi.org/10.4028/www.scientific.net/amm.809-810.968.

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The paper proposes to realize a simulative analysis following the theoretical notions regarding the hydraulic jump, at flow of fluids through open channels, when open a plane penstock, which is located in a trapezoidal channel. A penstock is formed from a plan panel with upright movement in supports, with the possibility of adjustment a fluid flow by means of a handling device.

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Yang, Zhonghua, Fengpeng Bai, and Ke Xiang. "A lattice Boltzmann model for the open channel flows described by the Saint-Venant equations." Royal Society Open Science 6, no. 11 (2019): 190439. http://dx.doi.org/10.1098/rsos.190439.

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A new lattice Boltzmann method to simulate open channel flows with complex geometry described by a conservative form of Saint-Venant equations is developed. The Saint-Venant equations include an original treatment of the momentum equation source term. Concrete hydrostatic pressure thrust expressions are provided for rectangular, trapezoidal and irregular cross-section shapes. A D1Q3 lattice arrangement is adopted. External forces, such as bed friction and the static term, are discretized with a centred scheme. Bounce back and imposed boundary conditions are considered. To verify the proposed m

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Aksoy, Bülent, and A. Burcu Altan-Sakarya. "Optimal lined channel design." Canadian Journal of Civil Engineering 33, no. 5 (2006): 535–45. http://dx.doi.org/10.1139/l06-008.

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The optimum values of the section variables (side slope, bottom width, flow depth, and radius) for triangular, rectangular, trapezoidal, and circular channels are computed by minimizing the cost of the channel section. Manning's uniform flow formula is treated as the constraint of the optimization model. The cost function is arranged to include the cost of lining, the cost of earthwork, and the increment in the cost of earthwork with depth below the ground surface. The optimum values of section variables are expressed as explicit functions of unit cost terms. Unique values of optimum section v

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Zhang, Qing, Nikola Pekas, and David Juncker. "Design and Fabrication of Novel Compliant Electrostatically Actuated Microvalves." Advanced Materials Research 74 (June 2009): 179–82. http://dx.doi.org/10.4028/www.scientific.net/amr.74.179.

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Electrostatically actuated microvalves are appealing candidates to build fully integrated microfluidic circuits because of the direct transduction of electrical signals into mechanical responses at low power consumption levels. Practical solutions, however, are still lacking due to their multi-layered architecture and difficulties in incorporating heterogeneous materials. In this paper, we report the design and fabrication process of an electrostatically actuated gas microvalve amenable to large scale integration for gas flow control. The device we designed consists of an upper die, containing

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Roushangar, Kiyoumars, and Roghayeh Ghasempour. "Evaluation of the impact of channel geometry and rough elements arrangement in hydraulic jump energy dissipation via SVM." Journal of Hydroinformatics 21, no. 1 (2018): 92–103. http://dx.doi.org/10.2166/hydro.2018.028.

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Abstract Rough bed channels are one of the appurtenances used to dissipate the extra energy of the flow through hydraulic jump. The aim of this paper is to assess the effects of channel geometry and rough boundary conditions (i.e., rectangular, trapezoidal, and expanding channels with different rough elements) in predicting the hydraulic jump energy dissipation using support vector machine (SVM) as a meta-model approach. Using different experimental data series, different models were developed with and without considering dimensional analysis. The results approved capability of the SVM model i

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