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. Objectives of the present study are to estimate the heat transfer performance of the present device and to clarify the thermal hydraulic characteristics of condensation in a capillary tube by observation of condensation behavior. As the results, it is confirmed that the microchannel heat exchanger has quantity of heat exchange of 7 kW when steam condensation occurred. In a single capillary tube as simulated unit microchannel, the flow pattern is transferred from the annular flow to bubbly flow through injection flow in a capillary tube.
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