Abstract
Laminarization of turbulent flow of helium in an asymmetrically heated vertical channel was investigated using a low-Reynolds number turbulence model. The investigation was done for inlet Reynolds number ranging from 4000 to 10000, nondimensional wall heat flux ranging from 0.001 to 0.006, and wall heat flux ratio ranging from 0 to 1. A laminarization criterion, based on the ration of turbulence production to turbulence dissipation rate, has been developed as a function of inlet Reynolds number, nondimensional wall heat flux, and wall heat flux ratio. An increase in asymmetry of the wall heat flux is seen to arrest laminarization. The results predict a reduction in the Nusselt number as compared to the constant property turbulent flow results, ranging from as much as 57% reduction for inlet Reynolds number of 4000 to 19% reduction for inlet Reynolds number of 10000.
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