Verification and Application of Optimal Formalized Equations
A series of calculations are performed for verification of the optimal formalized equations of Nusselt number. While, such optimal formalized equations are based on the rigorous numerical solutions of the wall similarity temperature gradient. The calculated results are very well coincident to the related numerical solutions on the wall similarity temperature gradient. Then, the optimal formalized equations of Nusselt number, which are based on consideration of coupled effect of variable physical properties have solid theoretical and practical value. Three calculation examples are given for evaluation of water mixed convection heat transfer, and demonstrate that the deviations of heat transfer rate with consideration of Boussinesq approximation is up to over 8.4 % to that with consideration of coupled effect of variable physical properties.