Simulation of Complete Liquid-Vapor Phase Change inside Divergent Porous Evaporator

Abstract

Abstract-Complete phase change process within a divergent porous evaporator is numerically investigated in this paper. A smoothing algorithm, proposed by the present authors, is used in order to deal with the discontinuity in effective diffusion coefficient. Effects of various parameters on the temperature distribution are carefully investigated, which clearly indicate that operating conditions and the geometry of diffuser strongly influence the outlet condition of steam, whereas, porous media properties have only minor impact.Index Terms-Complete phase change, divergent evaporator, porous media, smoothing of diffusion coefficient.

Investigation of phase change characteristics for refrigerant R-134a flow in a double pipe heat exchanger with the use of thermal non-equilibrium model

“…These two models may be used to emulate the evaporation process through porous media, though all basic variables of TPMM [2] depend on the supposition of LTE model. In last decades, considerable interest had been rewarded to LTNE model because it is very accurate for simulate the local temperature of solid and fluid phases [3][4][5][6][7][8][9].…”

“…Alomar et al [5] presented a new algorithm that rejects the cut-outs in the effective diffusion term through the borders which separates the single to two-phase areas. This algorithm was effectively utilized to analyse the one-dimensional full evaporation process in a divergent porous pipe.…”

Conjugate local thermal nonequilibrium and non‐Darcy flow inside porous enclosure: Analysis of localized heating and cooling arrangements

“…Heat transfer in the systems including flow in porous medium has gotten extensive consideration because of a wide scope of designing applications, for example, insulations for buildings, energy‐proficient drying measures, and so on 1–3 . Other applications exist such as heat insulation and solar energy collectors 4–10 .…”

“…Heat transfer in the systems including flow in porous medium has gotten extensive consideration because of a wide scope of designing applications, for example, insulations for buildings, energy-proficient drying measures, and so on. [1][2][3] Other applications exist such as heat insulation and solar energy collectors. [4][5][6][7][8][9][10] For fluid flow in porous medium, the formulation of Darcy can be used with low velocity and the non-Darcian can be used considered with high velocity.…”