Abstract
At present, a microchannel heat exchanger is requested to achieve high efficiency in small size energy equipment. In order to clarify the heat transfer mechanism in a microchannel heat exchanger, knowledge on the thermal hydraulic characteristics of condensation flow in channels is essential. However, study on characteristics of condensation flow in a microchannel is hardly conducted except visualization of flow patterns. The objective of the present study is to clarify the thermal hydraulic characteristics of condensation flow in a capillary tube by the observation of condensation behavior. As the results, the flow pattern is transformed from the annular flow to the bubbly flow through the injection flow in a single capillary glass tube as simulated unit microchannel. And it is confirmed that the overall heat transfer coefficient in the annular flow region becomes approximately 4 kW/m^2K.
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