Abstract
In order to understand the mechanism and characteristics of the running and heat transfer of pulsating heat pipe, visualizing experimental system was established. Bottom heat mode and top heat mode have been done. In the case of bottom heat mode different diameters have been investigated. The results indicate that the total thermal resistance of PHP was decreased with heat transfer rate and increased with filling ratio for two heat mode. Thermal resistance of PHP for bottom heat mode is higher than top heat mode. The startup time is shorter for bottom heat mode than top heat mode. Thermal resistance of uneven inner diameter PHP is higher than even inner diameter pipe.
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