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Nusselt Number Measurements for Turbulent Rayleigh-Bénard Convection
Physical Review Letters, 2003We present high-precision measurements of the Nusselt number N as a function of the Rayleigh number R for a cylindrical sample of water (Prandtl number sigma=4.4) of height L approximately equal to 50 cm and aspect ratio Gamma identical with D/L approximately equal to 1 (D is the diameter) for 3 x 10(9)< or =R< or =6 x 10(10).
Alexei, Nikolaenko, Guenter, Ahlers
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A New Nusselt Number for Complicated Configurations
Volume 3: Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat Transfer in Electronic Equipment; Symposium in Honor of Professor Richard Goldstein; Symposium in Honor of Prof. Spalding; Symposium in Honor of Prof. Arthur E. Bergles, 2013Convective heat transfer over surfaces is generally presented in the form of the heat-transfer coefficient (h) or its nondimensional form, the Nusselt number (Nu). Both require the specification of the free-stream temperature (Too) or the bulk (Tb) temperature, which are clearly defined only for simple configurations.
Tom I-Ping Shih +1 more
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Rayleigh–Bénard convection: Improved bounds on the Nusselt number
Journal of Mathematical Physics, 2011We consider Rayleigh–Bénard convection as modelled by the Boussinesq equations in the infinite-Prandtl-number limit. We are interested in the scaling of the average upward heat transport, the Nusselt number Nu, in terms of the non-dimensionalized temperature forcing, the Rayleigh number Ra.
Otto, Felix, Seis, Christian
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Drop Nusselt numbers in dropwise condensation
Applied Scientific Research, 1974Most of the theoretical studies in dropwise condensation have based their analysis on the principle that the heat transfer rate limiting mechanism in dropwise condensation is the conduction of heat through drops. Based on this principle, Fatica and Katz presented shape factor values for droplets and these values have been used by other studies.
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Nusselt number of a sphere in creeping flow
International Communications in Heat and Mass Transfer, 1990Abstract Rates of heat or mass transfer from a spherical droplet translating in a field under creeping flow conditions are examined. The existing expressions for Nusselt numbers are evaluated via an independent numerical analysis.
R.W. Ghrist, D.L.R. Oliver
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2015
It can be argued that the exchange of energy between a solid and a fluid is important in most, if not virtually all, practical situations for which heat transfer plays a role. The goal of this chapter is to determine the convective heat transfer coefficients between the coffee and the mug and between the mug and ambient that have been used in the ...
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It can be argued that the exchange of energy between a solid and a fluid is important in most, if not virtually all, practical situations for which heat transfer plays a role. The goal of this chapter is to determine the convective heat transfer coefficients between the coffee and the mug and between the mug and ambient that have been used in the ...
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Prandtl number dependence of Nusselt number in direct numerical simulations
Journal of Fluid Mechanics, 2000The dependence of the Nusselt number Nu on the Rayleigh Ra and Prandtl Pr number is determined for 104 < Ra < 107 and 0.07 < Pr < 7 using DNS with no-slip upper and lower boundaries and free-slip sidewalls in a 8 × 8 × 2 box. Nusselt numbers, velocity scales and boundary layer thicknesses are calculated.
Kerr, Robert M., Herring, Jackson R.
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A Nusselt Number Correlation Classification System
1999 Annual Conference ProceedingsComment: 13 ...
Todd Jammer +3 more
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Sensible heat flux from sparse vegetation estimated using Nusselt numbers
Physics and Chemistry of the Earth, 1996Abstract In semi-arid regions, the contribution of fluxes from the bare soil to the total fluxes of heat, water vapour and momentum is considerable. A simple technique is presented to estimate the sensible heat from the soil by using Nusselt numbers.
Jacobs, A.F.G. +2 more
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Nusselt Numbers in Rectangular Ducts With Laminar Viscous Dissipation
Journal of Heat Transfer, 1999In this paper, the steady temperature distribution and the Nusselt numbers are analytically determined for a Newtonian incompressible fluid in a rectangular duct, in fully developed laminar flow with viscous dissipation, for any combination of heated and adiabatic sides of the duct, in H1 boundary condition, and neglecting the axial heat conduction in ...
G. L. Morini, M. Spiga
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