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.
Highlights
Boiling heat transfer, like nucleate boiling, is one of the efficient types of heat transfer[1]
High heat fluxes can be achieved at low superheats in the nucleate boiling
The electric field can be used to study the hydrodynamics of the bubble and understand the dynamic behavior of bubble deformation and decomposition
Summary
Like nucleate boiling, is one of the efficient types of heat transfer[1]. The developed model was verified with experimental data in the absence of an electric field in terms of bubble departure diameter.
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