Influence of thermophysical properties on two-phase flow convective boiling of refrigerant mixtures

2002 ◽  
Vol 22 (14) ◽  
pp. 1535-1548 ◽  
Author(s):  
Samuel M. Sami ◽  
Joseph D. Comeau
Keyword(s):  
Thermophysical Properties ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Convective Boiling ◽  
Refrigerant Mixtures

Numerical Simulation of Forced Convective Boiling in a Microchannel

2018 ◽  
Vol 10 (4) ◽  
Author(s):  
Yun Whan Na ◽  
J. N. Chung
Keyword(s):  
Numerical Simulation ◽  
Two Phase Flow ◽  
Liquid Velocity ◽  
Flow Boiling ◽  
Simulation Method ◽  
Flow Patterns ◽  
Heat Fluxes ◽  
Phase Flow ◽  
Two Phase ◽  
Convective Boiling

Forced convective flow boiling in a single microchannel with different channel heights was studied through a numerical simulation method to investigate bubble dynamics, two-phase flow patterns, and boiling heat transfer. The momentum and energy equations were solved using a finite volume (FV) numerical method, while the liquid–vapor interface of a bubble is captured using the volume of fluid (VOF) technique. The effects of different constant wall heat fluxes and different channel heights on the boiling mechanisms were investigated. The effects of liquid velocity on the bubble departure diameter were also analyzed. The predicted bubble shapes and distribution profiles together with two-phase flow patterns are also provided.

Linear Instability Analysis of a Horizontal Two-Phase Flow in the Presence of Electrohydrodynamic Extraction Force

2001 ◽  
Vol 124 (1) ◽  
pp. 102-110 ◽  
Author(s):  
Y. Feng ◽  
J. Seyed-Yagoobi
Keyword(s):  
Electric Field ◽  
Two Phase Flow ◽  
Linear Instability ◽  
Vapor Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Convective Boiling ◽  
Stability Maps ◽  
Two Phases ◽  
Linear Instability Analysis

The flow regimes associated with a horizontal internal two-phase (liquid-vapor) flow in the presence and absence of the electric field are investigated with the linear stability analysis. The momentum interchange due to the entrainment between the two phases is included in the analysis. The presence of the electric field promotes instability by providing the electrohydrodynamic (EHD) extraction force. Qualitative stability maps for the annular two-phase flow are provided with and without the electric field presence. Onset of the instability is compared with the experimental data and it is shown that the transition between the EHD-enhanced and EHD-suppressed convective boiling heat transfer is located near the annular-to-mist transition region.

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