Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 40 for “"rectangular channel"”.
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Turbulent flow through a rectangular channel
… at 80 normal locations across a two-inch high rectangular water channel. A two polarization, three beam He-Ne Laser-Doppler Velocimetry system was used. The water channel was specifically designed and constructed to facilitate these optical measurements. It had negligible vibration and flow …
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Isothermal helium flow measurements twrough a rectangular channel for a Wide Knudsen range
… the isothermal steady flow of Helium through a rectangular microchannel from the continuum to the free-molecular regime. The intention is to expand the measured Knudsen number range for rectangular cross section microchannels as compared with that presently found in in the literature. As …
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Single-Phase Heat Transfer Effects of Mixing Vane Geometries in a Narrow Rectangular Channel
… mixing vane geometries are introduced into flow channels, building on previously developed high spatial- and temporal- resolution optical and infrared imaging techniques. A high-resolution experimental database would allow researchers to understand the boiling physics at the smallest scales, …
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An incompressible three-dimensional turbulent boundary layer on the floor of a recurving rectangular channel
… in any single profile. A recurving or s-shaped rectangular channel was used to experimentally investigate the possible existence of such a turbulent boundary layer flow. The time average velocity profiles along the centerline of this channel were obtained with a hot film anemometer. The …
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Experimental Study of Wall Shear Stress Modification by Surface Coating: Pressure Drop Measurements in a Rectangular Channel
… Quantification of surface drag reduction in rectangular channel flow over walls with specific hydrophobic or hydrophilic properties was obtained with pressure drop measurements along the channel for a range of Reynolds numbers between 350 and 5900. Several commercially available materials and …
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Topological Chaos and Mixing in Lid-Driven Cavities and Rectangular Channels
… investigated in lid-driven cavities and rectangular channels without internal rods. When a two-dimensional incompressible Newtonian flow is in the Stokes flow regime, the stream function satisfies the two-dimensional biharmonic equation. When the flow occurs in a lid-driven cavity with …
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Three-Dimensional Analysis of Boundary Layers in Magnetohydrodynamic Open Channel Flow
The pumping of liquid metals through open channels by MHD effects can be applied to slag separation or continuous casting processes by the metallurgy industry. This study involves the analysis of the boundary layer structure of non-uniform open channel flow in a rectangular channel, with perfectly …
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The Effects of Fluid Flow on The Pitting Corrosion of Pure Iron in Acidic Chloride Media
… pitting of pure iron were investigated. A rectangular channel with minimized wall and entrance effects was used. The electrolytic solution consisted of an aqueous solution of 0.5 M sulfuric acid and 0.003 M sodium chloride. The experiments were carried out under continuous flow rate or were …
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Velocity distribution in steep rough channel
… tumbling and rapid flow regimes in a steep rectangular channel with artificial roughness elements. Four shapes of roughness elements, rectangular, parallelogram, triangular, and semi-circular, were used. Effects on velocity distribution due to variations in discharge, flume slope and …
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Nondimensional analysis of spatially varied flow in rectangular channels
… application of this nondimensional equation to rectangular channels of various roughness values. A rectangular channel with continuous flow was constructed in order to establish uniform flow. The channel roughness was altered by placing screen wire and wooden cubes in the channel. Manning …
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Experimental, theoretical and computational modeling of flow boiling, flow condensation and evaporating falling films
… flux in a horizontal 2.5-mm wide by 5-mm high rectangular channel in different orientations with respect to Earth gravity using FC-72 as working fluid. High-speed video imaging is used to identify dominant interfacial characteristics for different combinations of inlet conditions and heating …
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Computation of heat transfer in turbine rotor blade cooling channels with angled rib turbulators
… on heat transfer in rotating two-pass square and rectangular channels with smooth walls and walls with 45 degree angled and V-shaped rib turbulators were investigated numerically using an unstructured, incompressible, Reynolds-averaged Navier-Stokes flow solver. The influence of 45 degree angled …
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Vortex generator arrays in air-cooled condensers for power plant applications
… of laminar convective heat transfer in a rectangular channel with different configurations of delta-winglet vortex generators (VG). A low and high Reynolds number case of 225 and 1123 is simulated which is representative of the lower and upper limits of the air velocity range between 1-5 …
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A numerical simulation of two-dimensional separated flow in a symmetric open-channel expansion using the depth-integrated two-equation (K-E) turbulence closure model
… presented for separated flow in a wide, shallow, rectangular channel with an abrupt expansion in width. The well-known numerical problems associated with the use of upwind and central finite differences for convection is overcome by the adoption of the spatially third-order accurate QUICK finite …
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The application of implicit method to open-channel surges
… modified so as to make it applicable to open-channel shocks. The output of the computer program with θ = 0.6 compared favorably with the experimental result. A comparison was also made with other explicit schemes and a two step implicit scheme proposed by other investigators. The implicit …
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An experimental study of critical heat flux with surface modification and its analytic prediction model development
… tests were conducted using R-134a coolant in a rectangular channel (half inch by half inch) with one uniformly heated surface. This is a surface heat flux controlled system. This refrigerant is selected as a stimulant fluid for water due to its small surface tension, low latent heat, and low …
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Shock formation in overexpanded flow: a study using the hydraulic analogy
… was modeled on a water table using a sharp-edged rectangular channel. The hydraulic analogy between free surface water flows and compressible gas flows was used to study the implications of the water table flow on tip leakage flows. The flow on the water table exhibited oblique hydraulic jumps …
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Quantification of Mixing in Microchannels
Microchannels are used for delivery of two-or more fluids for multiple purposes, such as drug delivery, where good mixing is desired in a very short time (or distance). For this purpose, many design options are being proposed in the literature. For example herringbone baffles at the bottom of a …
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Oscillations of a Fluid in a Channel
… contained in an uncovered three-dimensional rectangular channel. The upper surface changes with the motion of the fluid, so we deal with a free boundary problem. We consider small perturbations of a uniform flow with a flat free surface. We include the effect of the surface tension; the …
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Velocity distribution prediction in rectangular and compound channels under smooth and rough flow conditions
… distributions in single and compound open channels. In this study, velocity distributions in rectangular and compound open channels under different flow regimes, in terms of roughness and turbulence conditions, were investigated experimentally and numerically. The detailed results from the …
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