Numerical predictions of local entropy generation for an impinging jet.

摘要

Predictions of local volumetric entropy generation rates were made numerically for the convective heat transfer problems of a fluid jet impinging on isothermal and constant heat flux surfaces. The solution technique yielded a scalar field of volumetric entropy generation rates that extends over the fluid domain. For isotropic and Newtonian fluids local entropy generation rates, that stem from the irreversible phenomena of heat transfer across a finite temperature difference and viscous fluid flow, may be computed from fields of temperature, local temperature gradients, and the local viscous dissipation function. The primary points of interest for this problem were to investigate the surface heat transfer rates as a function of inlet jet velocities, and the apportionment between viscous and thermal source entropy generation. The problem investigated was restricted to two-dimensional slot jet flow with two fluids, helium and glycerin. 12 refs., 9 figs., 4 tabs.