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BUBBLE DYNAMICS DURING POOL BOILING UNDER MICROGRAVITY CONDITIONS

Dean Vijay K. Dhir
Henry Samueli School of Engineering and Applied Science, Mechanical and Aerospace Engineering Department, University of California, Los Angeles, Los Angeles, California 90095, USA

Abstrakt

A numerical tool has been developed over the last decade to study bubble dynamics and associated heat transfer during nucleate pool boiling. The numerical model divides the domain of interest into micro and macro regions. The micro region is the ultra-thin liquid layer that forms between the advancing or receding vapor-liquid interface and the solid wall. The macro region is the vapor-liquid occupied region away from the heated wall and excluding the micro region. Lubrication theory is used for the solution of the microlayer. Complete conservation equations of mass, momentum and energy are solved in the macro region. A level set function is used to capture the evolving, merging and breaking interfaces. Gravity is an important variable of the problem. Experiments at earth normal gravity, reduced gravity in the parabolic flights and microgravity conditions on the International Space Station (ISS) are used to validate the numerical results. The reduced gravity is shown to increase the length and time scale of the process. Although bubble dynamics and vapor removal process (except the bubble size) remain the same up to one-hundredth of earth normal gravity, there is a significant change in the vapor removal pattern under microgravity conditions.

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