Title: COMBINED FORCES AND FREE TURBULENT CONVECTION IN A VERTICAL TUBE (thesis). Technical Report No. 12
Abstract: An analytical study was made of turbulent heat transfer in a vertical circular tube under the conditions of combined forced and free convection with uniform wall heat flux. The basic conservation laws were reduced to three coupled, linear integro-differential equations in which the parameters are: Prandtl number, Pr; Rayleigh number, Ra; and friction Reynolds number, Re*. The following values of these parameters were investigated: Pr = 1, 10, 100; Ra == 10/ sup 4/, 10/sup 5/. The IBM 704 digital computer was used to solve the three equations for the fully developed velocity profile, temperature profile, and pressure drop. An extension of these resuits yielded the mixed-mean-to-wall temperature difference, Nusselt number, and Reynolds number for a given problem. The results for turbulent heat transfer, combined forced and free convection problems showed that the pressure drop parameter, C, and the Nusselt number, Nu, increase by approximately an order of magnitude as Re* increases from 0 to l0/sup 3/ to 10/sup 4/ to 10/sup 5/. The prandtl number, Pr, has a smaller effect on C and Nu, decreasing Editor please delete 10149
Publication Year: 1962
Publication Date: 1962-01-01
Language: en
Type: article
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