Numerical study of thermally developing turbulent internal flows

The effect of fluid Prandtl number on the thermal characteristics flow at thermal-entry region a hydrodynamically fully developed turbulent channel friction Reynolds Re?=180 is investigated using direct numerical simulation. Four test cases with molecular numbers Pr = 0.71, 1, 3, 7 are considered. results confirm that in contrast to laminar flows, where entry length increases increase number, for flows accelerates development toward its asymptotic state. variations Nusselt and mean rms temperature profiles reported streamwise direction. It shown highest considered this study (Pr =7 ), while profile logarithmic still developing, conductive sublayer approach their values, confirming dependence sublayer. direction also be good indicator reaching thermally condition. temperature-velocity correlations, variance budgets, contours different locations numbers.