Abstract
Observation of bubble flow and the measurement of heat transfer rate in a looped capillary heat pipe were experimentally conducted. The horizontal capillary pipe was made of glass. Ethanol was used as a working liquid. Heat transfer rate and temperature fluctuations of the pipe wall were measured under various temperature differences between the heating and cooling sections. The result shows that the heat transfer rate decreases with increasing the temperature difference. The highest heat transfer rate was obtained when the temperature of the heating section is near the boiling point of the liquid.
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