Effect of Dissolved Gas on Bubble Behavior and Heat Transfer in Forced Flow Boiling

Abstract

In recent years, a highly efficient cooling system is eagerly desired because of high heat flux associated with miniaturization of electronic devices and large amount of heat with upsizing of space equipment. The heat removal performance of cooling system using flow boiling, it is necessary to deepen the knowledge on the forced flow phenomenon affected by dissolved gas in the working fluid. The purpose of this study is to clarify the effect of dissolved air on boiling heat transfer and flow behavior in forced flow boiling. Therefore, we conducted a visualization experiment of boiling two-phase flow and measurement heat transfer coefficient. As a visualization result, the frequency of bubble formation due to boiling increased with the increase in the concentration of dissolved air. In addition, the precipitated non condensable gas was observed to form a boiling nucleus.