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Showing 1 to 12 of 12 for “"relative roughness"”.
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Friction equation for uniform flow in channels of large relative roughness
… thesis is an experimental investigation of the roughness problem in open channel flow. A literature review is given on the previous research done on friction factors. It is done in chronological order, so that the historical development of the friction equation can be seen.
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Detection Method of Subclinical Atherosclerosis of the Carotid Artery with a Hemodynamics Modeling Approach
… turbulent flow, dictated by Reynolds number and relative roughness, was modeled through the carotid artery bifurcation to compare shear stress and shear rate. Computer-aided design and fluid flow software were used to model hemodynamics through the carotid artery. Data from the model was derived …
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Thermal Management with Supercritical Carbon Dioxide under Extreme Applications
… high mass fluxes, the pressure drop is still relatively low at only 3.2% of the operating pressure. On the other hand, when sCO2 is utilized within a gas-cooler, increasing the relative roughness on the CO2 side of the heat exchanger can increase the effectiveness of the heat exchanger. …
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Laboratory Debris Flow Experiments: A Study of Erosion
… mechanisms, inter-particle collisions, and relative roughness.
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Convection from ice roughness surfaces using scaled Reynolds numbers for larger NACA 0012 airfoils.
… characterized the convective heat transfer for roughness surfaces exposed to accelerating flow similar to that experienced by a 21-in. NACA 0012 airfoil. The current study characterizes the convective heat transfer using the same roughness surfaces but exposed to flow scaled to that of a larger …
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Turbulent flow in a porous tube with wall suction.
… of Aggarwal et al (1972). The value of the relative roughness obtained in this study showed that the porous tubing under study is smoother than most of the tubing used as laterals in the traditional trickle irrigation. Also, the fact that the friction factors agreed with the Colebrook-White …
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Flow resistance corrections for physical models using unit flowrates
… resistance equation, where a value of Manning's roughness coefficient n, indicates the magnitude of flow resistance. Physical hydraulic models are one method to estimate Manning's n values for prototype channel reaches. A physical hydraulic model evaluates prototype channel characteristics at the …
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Experimentally Determined Equivalent Roughness Values For Two Types of Longitudinal Straight Duct Produced by a Small Company
… for rough conditions it is dominated by the relative roughness (epsilon/Dh). The Colebrook equation is often used to determine the f value as it also provides a reasonable value when the flow is in the transient region between hydraulically smooth and rough wall conditions.;Experimental data …
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Energetics of Turbulence Explains Physical Transport Processes in the Environment
… interactions between turbulent eddies and bed roughness. The result is a mathematical derivation of a modified Nikuradse curve that links the friction factor to Reynolds number and wall roughness.</p><p>Chapter 3 extends the co-spectral budget model to link the incipient motion of sediments to …
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The adsorption of colloidal particles by coal
… no correlation of proximate chemical analysis or relative roughness with adsorptive power could be obtained. 4. The method of determining surface area used in this investigation is a satisfactory means of obtaining relative external surface area of coal particles of the sizes tested.
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Effects of Posidonia oceanica seagrass on nearshore waves and wave-induced flows.
… Reynolds numbers, the canopyinduced hydraulic roughness (r) appears to be a function of the canopy element density only, and the empirical formula of Nielsen (1992) is successfully applied. However, more work is required in low energy conditions to examine the range of validity of the formula. …
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The effects of groundwater seepage on stream regimen : a laboratory study
… of bedform faces (angle of repose), bottom roughness and turbulence, and transport rate. The inverse relationship of seepage to transport rate under these conditions is caused by steepening of bedform faces under conditions of downward seepage which results in greater bottom roughness and …