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Dissertations / Theses on the topic 'Trapezoidal Channel'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Remley, Timothy J. "Single-phase heat transfer in a trapezoidal channel." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/22212.

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2

Ortega, Thiago Borges. "Dimensionamento otimizado de canal trapezoidal pelo critério de custo global." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3147/tde-21062013-100507/.

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Este trabalho apresenta um modelo matemático de suporte à decisão para projeto de canais com seção trapezoidal, cujo regime de escoamento seja do tipo unidimensional, fluvial e permanente, para terrenos naturais. A seção é otimizada pelo critério de custo global, composto pelos custos de implantação (motorização, escavação, aterro, revestimento) e manutenção (conservação e operação, contabilizada através da perda de energia). A determinação da seção ótima foi feita por algoritmo de programação não linear. As variáveis analisadas foram o revestimento (custo, espessura, coeficiente de Manning),

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3

Subramanian, Karthik. "Turbulent heat transfer in a trapezoidal channel with transverse and v-shaped ribs on two opposite walls." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3175.

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This study investigates the turbulent heat transfer and friction in a trapezoidal channel with opposite walls roughened with transverse and v-shaped ribs. The roughened channel depicts the internal cooling passage of an aerofoil near the trailing edge. The various configurations investigated for this study are smooth channel, channel with 90° transverse ribs and channel with v-shaped ribs angled at 45°. The pitch-toheight ratio (P/e), rib height-to-hydraulic diameter ratio (e/Dh) and the aspect ratio (W/e) were maintained at 12, 0.1906 and 1, respectively. The configuration was tested for Reyn

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4

Evcimen, Taylan Ulas. "Effect Of Prismatic Roughness On Hydraulic Jump In Trapezoidal Channels." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614467/index.pdf.

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A study of the hydraulic jump on a trapezoidal prismatic channel and roughened beds is presented. Extensive measurements have been made regarding the characteristics of hydraulic jumps as sequent depths, wing fluctuations, energy dissipation and jump length on artificially roughened beds for Froude numbers between 4.16 and 14.58. Three different types of prismatic roughness elements and nine different roughness patterns were installed separately on channel bottom and side walls throughout the experiments to obtain rough surfaces. Strip roughness elements were built from fiberglass sheets and i

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5

Lee, Sang Won. "Heat transfer characteristics of a two-pass trapezoidal channel and a novel heat pipe." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1940.

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6

Venter, Johann Christiaan. "The optimal hydraulic diameter of semicircular and triangular shaped channels for compact heat exchangers / J.C. Venter." Thesis, North-West University, 2010. http://hdl.handle.net/10394/4629.

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All heat pump cycles have one common feature that connects them to one another; this feature is the presence of a heat exchanger. There are even some heat–driven cycles that are completely composed of heat exchangers, every heat exchanger fulfilling a different, though critical role. The need therefore exists to optimize heat exchangers, more specifically Compact Heat Exchangers (CHE). This study deals with the optimization of such a CHE by determining an optimal hydraulic diameter of the micro–channels in a CHE, for minimal hydraulic losses. Two Computational Fluid Dynamics (CFD) models were

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7

Oh, Sung Hyuk. "Experimental and numerical investigation of turbulent flow and heat (mass) transfer in a two-pass trapezoidal channel with turbulence promoters." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3198.

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8

Burger, Johannes Hendrik. "Non-Newtonian open channel flow: the effect of shape." Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/1296.

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Thesis submitted in fulfilment of the requirements for the degree Doctor of Technology: Mechanical Engineering in the Faculty of Engineering at the Cape Peninsula University of Technology 2014<br>Open channels, flumes or launders are used in the mining industry to transport slurries during processing and to disposal sites. Water plays a major part in the makeup of these slurries, its usage and availability is critical in countries where there are strict water usage management programs. The optimisation of flume design involves the maximisation of solids transport efficiency whilst, at the same

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9

Bühler, Rudolf Theoderich. "Estudo de transistores avançados de canal tensionado." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-19052015-151837/.

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A rápida e crescente demanda por tecnologias que permitam a redução das dimensões dos transistores planares de porta única leva a uma nova era de dispositivos tensionados mecanicamente. Os transistores de múltiplas portas (MuGFET) com canal de silício e o MOSFET planar convencional com canal de germânio são alguns destes promissores dispositivos avançados a receberem o tensionamento mecânico para aumento da mobilidade dos portadores. O tensionamento mecânico uniaxial, biaxial e ambos combinados são analisados através de simulação numérica de processos e dispositivos e medidas experimentais em

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10

Ansari, Kamran. "Boundary shear stress distribution and flow structures in trapezoidal channels." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/13006/.

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The commercially available Computational Fluid Dynamics (CFD) software ANSYS-CFX version 11 (2008) is employed to predict the distribution of the bed and sidewall shear stresses in trapezoidal open channels. The investigation includes computation of wall shear stress (1) directly, using CFD for a range of channels layouts (straight, turning, with ridges), and (2), building on the division line concept initially formulated by Leighly in 1932 and later by Einstein in 1942, through the evaluation of the Guo and Julien (2005) equations, as proposed by Cacqueray et al. (2009). These equations inclu

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11

Tamrakar, Swaraj. "Analytical Model Study of Flow Through Trapezoidal, Half-Trapezoidal and Rectangular Channels with Submerged and Un-submerged Rigid Cylinders." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1380.

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For this study, two analytical models were developed for predicting the depth-averaged velocity distribution (U) in trapezoidal, half-trapezoidal and rectangular channels with submerged and unsubmerged rigid cylinders. The first model uses linear superposition of momentum defects (MDS) and mass conservation, and is referred to as the MDS model. The second model uses linear superposition of velocity defects (VDS) and mass conservation, and is referred to as the VDS model. For implementing either the VDS or MDS model, a criterion is required for considering the wake created by an individual cyli

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12

Alhamid, A. I. "Boundary shear stress and velocity distribution in differentially roughened trapezoidal open channels." Thesis, University of Birmingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492543.

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13

Hagene, Matthew Ray. "Momentum Defect Superposition Model for Predicting Depth-Averaged Velocities in Trapezoidal Channels." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/553.

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An analytical model based on linear superposition of momentum defects is developed for predicting depth-averaged velocity distributions in trapezoidal and rectangular channels with submerged and unsubmerged rigid cylinders (i.e., simulated vegetation). The model is founded on wake theory and there is an existing model that is similar except for using linear superposition of velocity defects. The momentum defects and velocity defects supposition models both require a criterion for deciding when wakes created by the rigid cylinders will be considered completely dissipated (cutoff criterion).

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14

Yuen, K. W. H. "A study of boundary shear stress, flow resistance and momentum transfer in open channels with simple and compound trapezoidal cross sections." Thesis, University of Birmingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492540.

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The characteristics of fully developed turbulent flow in smooth open channels of simple trapezoidal cross-section have been examined experimentally in the range 0.5 < Fr < 3.5,1.9 x 104 < Re < 6.2 x 105 and 0.3 < 2b/H < 15.0. Subcritical flow in a compound trapezoidal channel has also been studied for relative depths between 0.05 < Dr 0.5. The effect of secondary flows and the interaction between the main channel and the flood plain flows have been shown to influence the boundary shear stress and velocity distributions significantly. For simple channels, the boundary shear stress distributions

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15

Kleynhans, Bertus George. "Effective material usage in a compact heat exchanger with periodic micro-channels / Bertus George Kleynhans." Thesis, North-West University, 2012. http://hdl.handle.net/10394/8707.

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All modern High Temperature Reactors (HTR) thermal cycles have one thing in common: the use of some form of heat exchanger. This heat exchanger is used to pre-heat or cool the primary loop gas, from where the secondary power generation cycle is driven. The Compact Heat Exchanger (CHE) type offers high heat loads in smaller volumes. Various studies have been done to improve the heat transfer in the flow channels of these CHEs but little focus has been placed on the thermal design of surrounding material in such a heat exchanger. The focus of this study is on the effective material usage in a CH

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16

Mohanty, Laxmipriya. "Velocity distribution in trapezoidal meandering channel." Thesis, 2013. http://ethesis.nitrkl.ac.in/5013/1/VELOCITY_DISTRIBUTION_IN_TRAPEZOIDAL_MEANDERING_CHANNEL.pdf.

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Analysis of fluvial flows are strongly influenced by geometry complexity and large overall uncertainty on every single measurable property, such as velocity distribution on different sectional parameters like width ratio, aspect ratio and hydraulic parameter such as relative depth. The geometry selected for this study is that of a smooth sine generated trapezoidal main channel flanked on both sides by wide flood plains. The parameters which were changed in this research work include the overbank flow depth, main channel flow depth, incoming discharge of the main channel and floodplains. This p

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17

Subrahmanya, Praveena Alangar, and 蘇邁亞. "Pool boiling on open trapezoidal channel surface." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/82191724169102979509.

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碩士<br>國立中央大學<br>能源工程研究所<br>103<br>In this thesis pool boiling experiment is carried out on open trapezoidal channel surface to study the effect of channel top width (0.4mm, 0.8mm, 1.4mm and 2.0mm) and fin pitch using saturated methanol as working fluid at one atmospheric pressure along with bubble dynamic visualisation. The channel were cut using wire electro-discharge machining technique and results are compared with corresponding plane surfaces. Plain boiling surface with comparatively high roughness value (manufactured by wire electro-discharge machining) consistently showed higher heat tra

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18

Kuo-ChingYu and 俞國靖. "Experimental heat transfer of impinging jet row in rotating trapezoidal channel." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/384627.

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碩士<br>國立成功大學<br>系統及船舶機電工程學系<br>107<br>Drive by the requirement for the heat transfer enhancement of the internal coolant channel of a gas turbine rotor blade, the present study investigates the heat transfer performances of the leading, impinging and trailing endwalls for the rotating trapezoidal channel with the impinging jet-row at the channel orientation angle of 45 degrees. The heat transfer coefficients of the present rotating channel with the imping jet-row were measured using the steady-state infrared thermography method at the parametric conditions defined by Reynolds number (Re), rota

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19

Su, Wei-Jie, and 蘇煒傑. "Heat transfer visualization inside trapezoidal internal cooling channel with X-shaped ribs." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/9uz8ke.

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碩士<br>國立交通大學<br>機械工程系所<br>107<br>To enhance heat transfer performance, rib has been widely applied to channel wall. In our research, vertical cooling channel with cross section of right angle trapezoid has been considered. Heater and rib were applied to the right angle wall and inclined wall with rib height-to-hydraulic diameter as 0.128. Ribs with V-shaped, full X-shaped and modified X-shaped which pointing upstream and downstream had been investigated. Dry air was applied as the cooling fluid, and the Reynolds numbers were from 10000~40000. Infrared camera (IR camera) has been used to captur

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20

PUJARI, SAURABH. "PREDICTION OF ENERGY DISSIPATION OVER TRAPEZOIDAL STEPPED SPILLWAY WITH BAFFLES." Thesis, 2023. http://dspace.dtu.ac.in:8080/jspui/handle/repository/20002.

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The stepped spillway of a dam holds significant importance in the field of river engineering and can be utilized in diverse applications. Conducting research on flood control is imperative to examine the mechanism by which energy dissipation occurs across stepped spillways. Numerous research endeavours have been conducted in the past to investigate rectangular stepped spillways without baffles, employing diverse research methodologies. The present research was carried out on a tilting flume in order to compute the energy loss through the trapezoidal stepped spillway at various channe

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21

Pu, Jaan H., M. Pandey, and P. R. Hanmaiahgari. "Analytical modelling of sidewall turbulence effect on streamwise velocity profile using 2D approach: A comparison of rectangular and trapezoidal open channel flows." 2020. http://hdl.handle.net/10454/17964.

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Yes<br>Natural earth-bounded channel flows usually subject to various sidewall turbulences, i.e. in the form of secondary currents, due to non-constant channel shapes at different sections. This paper investigates an improved Shiono-Knight model (SKM) by combining it with a Multi-Zonal (MZ) method (proposed by Pu, 2019) to represent lateral flow turbulence and secondary currents in different shapes of open channel, i.e. rectangular and trapezoidal. By applying the proposed analytical model to both rectangular and trapezoidal channel flows, we have inspected different streamwise velocity charac

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22

Bage, Prasanta, and Jena Sudhir. "Velocity Distribution at the Cross-Over of Sinusoidal Trapezoidal Meandering Channels." Thesis, 2012. http://ethesis.nitrkl.ac.in/3831/1/Thesis_.pdf.

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Evaluation of velocity distribution process longitudinally is very much essential for the environmental management, quantifying the mean velocity. In nature, most rivers tend to be of compound sections as well as meandering [1]. Velocity distribution is crucial for solving many engineering problems such as management of rivers and floodplains, it is important to understand the behaviours of flows within compound channels for designing of hydraulic structure, flood control, water management, sedimentation and excavation. During flood runoff water comes out natural or man-made channel, part of

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23

Ahlen, Karl. "End depth and flow relationships for smooth open trapezoidal and circular channels." Thesis, 1994. http://spectrum.library.concordia.ca/62/1/MM90814.pdf.

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The current study's objective was to obtain an accurate relationship between the end depth Y$\sb{\rm e}$ and the discharge rate for smooth open channels with trapezoidal and circular cross sections. To accomplish this, the momentum equation was used. The velocity and pressure head distributions at the end depth Y$\sb{\rm e}$ were determined to obtain the corresponding velocity and pressure coefficients, (alpha $\alpha$, beta $\beta$ and K). The pressure head readings were obtained through the use of a static Pitot tube. Velocity readings were obtained through the use of a Pitot tube and a Las

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24

Shie, Jia-Lun, and 謝家倫. "Establishment of roughness coefficient model for the vegetated-revetment trapezoid channel." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/32081272126500674362.

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碩士<br>萬能科技大學<br>工程科技研究所<br>96<br>Considering the channel slope and vegetated revetment, this research makes the according channel test and analyzes the hydraulic properties on trapezoid channel. The result analyzed from test data shows that Manning’s coefficient of vegetated revetment (nw) increases and then decreases with the channel slope (S) at the same flux (Q) and channel slope (Sw). The nw value is the largest at Sw = 10.4 and then approaches a constant value. Under the same flux, the nw value decreases with S. In addition, the smaller flux has a larger influence on the nw value. Under t

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25

Chen, Chuan-Yu, and 陳建佑. "Enhanced Condensation Heat Transfer for Dielectric Fluid within Trapezoid Micro-Channel Heat Sink." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3g23nh.

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碩士<br>國立交通大學<br>機械工程系所<br>107<br>This study experimentally investigates the condensation performance of the HFE-7100 within a multiport micro-channel heat sink with a hydraulic diameter of 1200 μm. The experiment is conducted at a fixed outlet pressure of 140 kPa with condensation heat flux of 120W. The condensation tests are carried out with mass fluxes ranging from 150 to 250 kg/m^2 s, vapor mass quality from 0.1 to 0.8 and inclined arrangement from -90° (vertical downward) to 90° (vertical upward). In addition, the present study proposes enhanced condensation design via a micro-drainage cav

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