Analysis of Two-Phase Flow inside Porous Diffuser

Abstract

Evaporation process inside diffuser filled with porous medium is numerically investigated. The governing equations have been made dimensionless form and discretised using Finite Volume Method (FVM). Effects of the relevant parameters on the temperature distribution and liquid saturation have been carefully analysed. Numerical results showed that the smoothing treatment of effective diffusion coefficient promote the undesired "jump" in the temperature profile. Furthermore, the inlet Reynolds number, heat flux, outlet radius, length of spread section, and pipe length have a strong effect on the beginning and ending of evaporation process, while porosity and Darcy number have slight influence. Finally, the investigation exhibits a helpful instrument for structuring a diffuser evaporator with goal to hold the system under safety conditions.

A thermal nonequilibrium model to natural convection inside non‐Darcy porous layer surrounded by horizontal heated plates with periodic boundary temperatures

“…In real porous medium, the solid thermal conductivity is extremely larger than the liquid part and hence, the heat that imposed at wall is transferred inside enclosure by the solid part mainly by conduction. Thus, the solid and fluid temperatures differ, although the temperature divergence may not be significant because the convective mechanism between solid and fluid parts is very high 44‐51 . In this case, the assumption of LTNE is more appropriate than LTE condition for modeling as a significant safety factor, especially when the difference between the mechanism of advection and conduction for transferring heat is substantial large.…”