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Critical Reynolds number in pipe Poiseuille flow
Physics Letters A, 1978Abstract In this paper, we show the instability of pipe Poiseuille flow in the framework of a nonlinear hydrodynamic stability theory.
J.M. Luijkx +2 more
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Journal of Wind Engineering and Industrial Aerodynamics, 2020
Abstract The Reynolds independence has been important for scaled experiments of urban aerodynamics in wind environment engineering. It helps to circumvent the difficulty in conserving the Re number for large scaling ratios. However, the criteria for Re-independence and its working mechanism have not been well investigated quantitatively.
Chang Shu +2 more
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Abstract The Reynolds independence has been important for scaled experiments of urban aerodynamics in wind environment engineering. It helps to circumvent the difficulty in conserving the Re number for large scaling ratios. However, the criteria for Re-independence and its working mechanism have not been well investigated quantitatively.
Chang Shu +2 more
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Nonlinear critical Reynolds number of a stratified plane Poiseuille flow
Physics of Fluids, 1996The minimum Reynolds number, ReNc, below which all the two-dimensional and monochromatic wave disturbances decay, is studied numerically for a thermally stratified plane Poiseuille flow. The ReNc is found to be sensitive to the change of Prandtl number P.
Li, H.-S., Fujimura, K.
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On critical reynolds numbers in plane channels with a sudden expansion at the entry
Computational Mathematics and Mathematical Physics, 2010Summary: A method for the numerical solution of fluid dynamics equations is proposed. The evolution of the structure of the laminar flow with increasing Reynolds number and its behavior at the critical Reynolds number \(Re_{cr}\) is analyzed. Various flow modes at \(Re = Re_{cr}\) are discussed.
Karskanov, S. A., Lipanov, A. M.
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Critical reynolds numbers for flows containing particles
Zeitschrift für angewandte Mathematik und Physik ZAMP, 1968Die Bedingungen, unter denen in der Stromung vorhandene Teilchen die kritische Reynoldszahl beeinflussen, wurden untersucht. Die Teilchen werden in laminarer Stromung instabil, wenn der vertikale Geschwindigkeitsgradient eine bestimmte Relation zum Teilchenradius bekommt.
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Characteristics of high Reynolds number flow in a critical nozzle
International Journal of Hydrogen Energy, 2013Abstract A critical nozzle has been used to measure a mass flow rate of gas. It is well known that the coefficient of discharge of the flow in a critical nozzle is a single function of Reynolds number. The purpose of the present study is to investigate the effect of equation of state (EOS) on the coefficient of discharge and thermodynamics properties
Junji Nagao +4 more
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Critical reynolds number for a spherical particle in plane couette flow
Zeitschrift für angewandte Mathematik und Physik ZAMP, 1970Es wird die Bewegung eines kleinen spharischen Teilchens in einer Couette-Stromung untersucht. Wenn die Reynolds-Zahl grosser ist als ein kritischer Wert, so wird die Teilchen-Bewegung in laminarer Stromung instabil und verursacht Turbulenz; unterhalb des kritischen Wertes bleibt die Stromung laminar.
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Free Stream Turbulence and the Critical Reynolds Number in a Duct
Transactions of the Canadian Society for Mechanical Engineering, 1973The effect of the turbulence level in the free stream on transition in a duct was studied by extending a previous experimental investigation on the effect of turbulence for the developing flow through a circular duct. The result indicates that the flow is always laminar below a certain range of Reynolds number independent of the turbulence level ...
K. C. Goel, Y. Lee
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Pressure distributions on circular cylinders at critical Reynolds numbers
Journal of Fluid Mechanics, 1973Measurements have been made of the mean and fluctuating pressure distributions on long circular cylinders, having smooth and rough surfaces, at Reynolds numbers of 1·11 × 105 and 2·35 × 105 in both uniform and turbulent streams. The presence of free-stream turbulence a t these Reynolds numbers was found to suppress coherent vortex shedding on the ...
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Vehicles Drag Reduction With Control of Critical Reynolds Number
Journal of Fluids Engineering, 2013Various vehicles have been designed as short blunt bodies. Drag coefficients of these bodies are high because adverse pressure gradients cause boundary layer separation from their surfaces, but a reduction of the size of separation zone allows for a substantial reduction of the body drag.
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