JP Journal of Heat and Mass Transfer
Volume 14, Issue 1, Pages 1 - 11
(February 2017) http://dx.doi.org/10.17654/HM014010001 |
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HEAT TRANSFER IN TWO-DIMENSIONAL RAYLEIGH-BÉNARD CONVECTION AT DIFFERENT RAYLEIGH NUMBER FOR MIXED BOUNDARY CONDITIONS
Chongyang Zhao and Yikun Wei
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Abstract: In this paper, the heat transfer and dynamics of Rayleigh-Bénard (RB) convection in a two-dimensional channel, subject to (heat and cool) inhomogeneous boundary conditions, are investigated at different Rayleigh number using a thermal lattice Boltzmann method (LBM). The effects of the heterogeneous pattern on the global heat exchange at both low and high Rayleigh numbers are presented. It is found that individual isothermal distribution appears independently near every heat source. It is also observed that individual isothermal distribution is merged and the whole isothermal distribution appears away from every heat source. It is further found that the velocity and temperature spectra have a roll-off rate of and respectively, consistent with the Bolgiano-Obukhov-like (BO59) scaling. A relationship between Rayleigh numbers (Ra) and Nusselt number (Nu) is constructed approximately for
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Keywords and phrases: transfer, LBM, inhomogeneous, Rayleigh, Nusselt. |
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