Abstract
At present, a microchannel heat exchanger is requested to achieve miniaturization and high efficiency in a small size energy equipment. In order to clarify the heat transfer mechanism in a microchannel heat exchanger, knowledge on thermal hydraulic characteristics in a microchannel is essential. The objective of the present study is to clarify the thermal hydraulic characteristics of phase change flow in a capillary tube through the observation of phase change behavior. From observation results, it is confirmed that the flow pattern is transformed from bubbly flow to annular flow through injection flow in a single capillary glass tube as simulated unit microtube
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