This article presents a numerical analysis of multi-phase flow with powerful swirling streams in a cylindrical separator equipped with two vortex generators in an attempt to predict the separation efficiency of an air-water mixture. New design of a cylindrical separator is introduced for air-water mixture.The mixture multiphase and large eddy simulation (LES) turbulence models were applied. Images that concern velocity field, pressure, and volume fraction are introduced. Air phase is trapped and localized along the centerline of the separator and then migrates toward the upper exit hole, while water phase is distributed and rotated along the wall, then confined at the mid-separator due to two strong clock-wise centrifugal forces before it is expelled through its exit at mid of separator. It was found that the separation efficiency at constant Reynolds number of 8×10 4 with two feeding volume fractions of 95% and 90% are 97.8% and 96.1%, respectively. Also, the separation efficiency at constant feeding volume fraction of 95% with two Reynolds numbers of 2×10 5 and 8×10 4 are 98.6% and 97.8%, respectively. It is revealed that the separation efficiency will increase as the Reynolds number increases and/or increasing the volume fraction.
A comparative experimental investigation on the effect of superheating of R‐22, R‐404A, R‐407C, and R‐422A as low‐temperature refrigerant blends on the performance of a vapor compression refrigeration system is conducted. Empty and porous evaporators with porosities of (40%, 43%, and 45%) are used during the tests, to predict good alternatives to the refrigerant R‐22, which has high ozone depletion potential and high global warming potential. Condensation, evaporation temperatures, degree of subcool are kept constants at 40°C, −26°C, and 6°C (±0.5°C), respectively. The effect of superheating on the compressor discharge temperature, evaporating pressure drop, evaporating capacity, volumetric refrigeration capacity and coefficient of performance (COP) of these refrigerants has been analyzed. Refrigerants, R‐422A and R‐404A showed greater performances than that of R‐22. The percentages of increase in evaporation capacities of R‐407c, R‐22, R‐404A, and R‐422A are approximately 144%, 168%, 146.3%, and 161.5%, respectively, when changing the degrees of superheat from 6°C to 16°C and changing the porosity from empty evaporator to 40%. The percentages of increase in COP are approximately 319%, 320%, 312%, and 350%, respectively. The percentages of increase in evaporation capacities of R‐422A and R‐404A when compared with R‐22 under the same conditions are 18.6% and 8.8%, respectively, while the percentages of increase in COP when compared with R‐22 are 17% and 12%, respectively.
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