Results 191 to 200 of about 3,296 (231)
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Turbulent Prandtl number in a circular jet
International Journal of Heat and Mass Transfer, 1990Abstract Measurements of the Reynolds shear stress and heat flux distributions at a number of streamwise stations in a heated circular jet into still air indicate that the flow is approximately self-preserving at x d = 15 . Measurements made with a 120° X-probe are in closer agreement with calculations obtained by integrating the mean ...
L.P. Chua, R.A. Antonia
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Turbulent Prandtl number in circular pipes
International Journal of Heat and Mass Transfer, 1984Presentation d'une methode de calcul du nombre de Prandtl pour un ecoulement turbulent dans une conduite circulaire a partir du nombre de Nusselt. Resultats obtenus pour differents fluides a differentes temperatures: eau, CO 2 , glycerol, ethylene ...
A. Malhotra, S.S. Kang
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A Reinterpretation of the Turbulent Prandtl Number
Industrial & Engineering Chemistry Research, 2002The eddy viscosity at any location in fully developed turbulent flow in a round pipe is shown by an exact analysis to be simply the ratio of the shear stress due to the time-averaged turbulent fluc...
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Effect of Prandtl number on the turbulent thermal field in annular pipe flow
International Communications in Heat and Mass Transfer, 2010 International audienceThe effect of Prandtl number on the turbulent thermal statistics in fully developed annular pipe flow, with isoflux boundary conditions, is investigated by use of direct numerical simulation, for two values of Reynolds number.
A. Mazouz +7 more
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Prandtl-number dependence of turbulent flame propagation
Physical Review E, 2001Inertial-range cascade phenomenology is used to predict Prandtl-number (Pr) dependencies of turbulent flame properties. A unified picture of turbulent flame structure and burning velocity is developed that encompasses all Pr regimes. Implications of the analysis for gaseous flames (Pr near unity), autocatalytic fronts in liquids (high Pr), and ...
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Turbulent Thermal Convection at Arbitrary Prandtl Number
The Physics of Fluids, 1962The mixing-length theory of turbulent thermal convection in a gravitationally unstable fluid is extended to yield the dependence of Nusselt number H/H0 on both Prandtl number σ and Rayleigh number Ra. The analysis assumes a layer of Boussinesq fluid contained between infinite, horizontal, perfectly conducting, rigid plates.
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A model of the turbulent burst phenomenon: Predictions for turbulent prandtl number
Letters in Heat and Mass Transfer, 1981Abstract A preliminary analysis is developed coupling surface-renewal and classical ideas which accounts for the fundamental difference between the transport process within the wall region and the turbulent core. It shows that Pr t increases with Pr very near the wall, but decreases with Pr at greater distances from the wall.
L.C. Thomas, M.B. Ibrahim
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Turbulent Prandtl Number in Neutrally Buoyant Turbulent Round Jet
Journal of Engineering Mechanics, 2002A method which combines two nonintrusive imaging techniques, particle tracking velocimetry and laser induced fluorescence, was used to make simultaneous measurements of velocity and concentration in a neutrally buoyant turbulent round jet. The measurements were made at two different Reynolds numbers (R), 360 and 4,210, at a Schmidt number of 1,930. The
Kuang-An Chang, Edwin A. Cowen
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Turbulent Prandtl number and spectral characteristics of a turbulent mixing layer
International Journal of Heat and Mass Transfer, 1985Abstract Measurements have been made of all three velocity fluctuations and of the temperature fluctuations in a thermal mixing layer associated with a turbulent plane jet. In a region of the flow for which the Reynolds stresses and heat fluxes are large, the turbulent Prandtl number is equal to about 0.4. The small magnitude of the turbulent Prandtl
A.J. Chambers +2 more
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Modeling of turbulent Prandtl number in stationary and homogeneous stratified turbulence
OCEANS'10 IEEE SYDNEY, 2010The dependency of turbulent Prandtl number on the stratification stability was numerically investigated by means of direct numerical simulation of homogeneous and stratified turbulence in which the gradient Richardson number ranged from 0.05 to 0.15.
S. Hirabayashi, T. Sato
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