The high heat transfer rate and compactness of micro/minichannel mutiphase flow system associated with phase change phenomena have been increasingly attractive in thermal management and microfluidic sensor development for space applications which demand requirements such as small, light, and efficient systems. Although the numerous research efforts are given to vaporization, there has not been sufficient study to understand condensation phenomena for the applications. This paper first discusses research consideration and small scale effects on condensation, especially in microscale system. NASA’s researches related to heterogeneous condensation nucleation and wall condensation are introduced to demonstrate current practical applications and demand for condensation studies.

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