Abstract
Flow and Heat transfer characteristics of the boiling two-phase flow of water in flat mini-rectangular-channels were examined. The cross-sections were in a range of 0.22mm×10mm〜0.65mm×10mm The length of the flow channel was 240mm including 50mm heating region. When the flow channel gap was relatively large; 0.65mm-0.37mm, the pressure drop of the single-phase water flow was well expressed with the correlations for the usual size over the laminar flow and the turbulent flow region. However, when the flow channel gap was narrow; 0.22mm, the measured pressure drop results showed the laminar flow trend in the experimental range until the Reynolds number=4,000. The single phase flow heat transfer was well expressed with the correlations for the usual size over the laminar flow and the turbulent flow region. However, when the flow channel gap was narrow; 0.22mm, the measured heat transfer coefficients followed the trend of the turbulent flow in the present experimental range. The nucleate boiling was dominant in the boiling heat transfer region. The critical heat flux was much lower than that of the pool nucleate boiling.
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