Experimental Study on the Mechanism of Transition Boiling Heat Transfer : 1st Report, Measurements of Local Solid-Liquid Contact and Temperature Fluctuations on the Heating Surface

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Measurement of solid-liquid contact and surface temperature fluctuations is conducted in case of nucleate and transition boiling of water on the horizontal copper surface of 8 mm diameter. From these measurements it is inferred that the mechanism of transition boiling is closely related to the behavior of vapor bubbles. The results obtained from the analysis of surface temperature records are as follows. (1) Transition boiling is distinguished by intermittent solid-liquid contact and the fluctuation of heat flux corresponding to the periodic departure of vapor bubbles from heating surface. (2) Local time rate of solid-liquid contact, which is smallest at the center of heating surface and largest at he circumference, decreases rapidly with the increase of wall superheat. (3) Transition boiling heat transfer can be explained as the coexistence of nucleate boiling heat transfer in the solid-liquid contact part and film boiling heat transfer in the solid-vapor contact part.
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