Abstract
Two-Phase flow in an inclined rectangular porous media, under unsteady-state condition, has been numerically investigated in this article, based on the modifiedh-formulation of Two-Phase Mixture Model (TPMM). The governing equations have been discretised using Finite Volume Method (FVM) and solved iteratively in a SIMPLE-like manner. Effects of various parameters on the flow and temperature fields have been investigated, which clearly demonstrated that the inclination angle strongly affect the boiling initiation. Recirculating flow has been observed when the inclination angle θ>0˚. The results clearly indicated that the operating conditions and the porous medium properties have significant effects on the initiation and termination of phase change process. A closer inspection of the results reveals that the presence of a critical inclination angle depending on the value of K*and, Re1which correspond to a maximum values of vapour volume. The modified h-formulation requires significantly less computational time as compared with the existingH-formulation of TPMM.
Highlights
Two-phase flow and analysis of boiling in porous media is an important topic, which spans a broad spectrum of engineering disciplines [1,2,3]
Based on Two-Phase Mixture Model (TPMM) proposed by Wang and coauthors [4 – 6], which consists of mass, momentum and energy conservation equations in the modified form, three distinct regions can be observed, if a liquid is injected into a porous evaporator
A major problem that is encountered when applied TPMM [6] during the simulation of two-phase flow within porous media is the occurrence of drastic, nonphysical change in the predicted temperature distribution over an extremely short distance that results primarily due to the presence of discontinuity in the effective diffusion coefficient across the interfaces
Summary
Two-phase flow and analysis of boiling in porous media is an important topic, which spans a broad spectrum of engineering disciplines [1,2,3]. Based on Two-Phase Mixture Model (TPMM) proposed by Wang and coauthors [4 – 6], which consists of mass, momentum and energy conservation equations in the modified form, three distinct regions can be observed, if a liquid is injected into a porous evaporator. They are: sub-cooled liquid region, two-phase region and superheated gaseous region. The results indicated that the anisotropy of permeability and solid thermal conductivity have significant effect on the complete evaporation process Another interesting feature of boiling and force convection effects is the influence of porous evaporator inclination. The mathematical formulation is based on the modified hformulation [25] along with LTE model
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