Study on the vertical oscillatory gas-liquid two-phase flow and heat transfer characteristics

Abstract

Exploring the flow and heat transfer characteristics of oscillations will help to evaluate the dynamic behavior and safety of thermal management systems (TMS) in automobiles, ships, and aircraft. Faraday waves is a phenomenon that standing waves oscillate with half of the driving frequency under specific oscillation conditions. The current work combines both, studying the influence of oscillation parameters of Faraday waves on heat transfer since the oscillatory liquid surface and the shaking of the liquid-filled container frequently occurs in practical engineering applications. A numerical simulation on heat transfer characteristics under different vibration parameters was carried out in this study. The results demonstrate that oscillation has a promotion effect on the heat transfer coefficient. The influence of the driving frequency on heat transfer will be affected by the driving amplitude. When the driving amplitude is greater than 0.83 mm or the driving frequency is greater than 22 Hz, the waveform will change from periodic and regular to disorder and turbulence, and the heat transfer between the two-phase flow will be significantly enhanced. In the range of oscillation parameters covered in this study, increasing the driving amplitude is more effective than increasing the driving frequency for enhancing heat transfer. And when the driving amplitude is big enough, such as A = 1.03 mm, the heat transfer intensity increases to about 1.5–2 times as against A = 0.43 mm. Therefore, when considering the design of TMS, the dynamic empirical correlations proposed by this study can offer some useful guidance.