Single-bubble EHD behavior into water two-phase flow under electric-field stress and gravitational acceleration using PFM

Abstract

In this study, single-bubble electro-hydrodynamic effects on the two-phase laminar flow of water under electric field stress are investigated using numerical modeling. A 2D axisymmetric model is also developed to study the growth and departure of a single bubble. The phase-field method is applied to track the interphase between liquid and gas. The growth of the attached vapor bubble nucleus to a superheat at 7.0 °C and 8.5 °C are evaluated with 50° and 90° contact angles. The results show that the enhancement of the contact angle changes the velocity and temperature fields around the bubble. It is observed that the growing size and base of the bubble is increased with increasing the wall superheat, but the bubble departure diameter and time are decreased. The electric field results in raising the number of detached bubbles from the superheat at a certain time interval but decreasing the bubbles departure size. Additionally, the formation of stretched bubbles enhances the rate of heat flux and there is a non-linear relationship between the applied voltage and heat flux.

Simulation of single bubble dynamic process in pool boiling process under microgravity based on phase field method

“…Yi et al [24] conducted numerical simulations of bubble growth under different gravity conditions, and studied the bubble growth behavior under different supercooling. Mianmahale et al [25] used the phase field method to track the interphase between liquid and gas, and studied single bubble electro hydrodynamic effects on the two-phase laminar flow of water under electric field stress. However, although there has a lot of research on boiling heat transfer, there still lacks of research on boiling heat transfer mechanism and bubble dynamic behavior under microgravity, and there has relatively few simulations using phase field method.…”