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Experimental study on startup characteristic and thermal performance of pulsating heat pipe with asymmetric non uniform heating

초록/요약

This thesis reports experimental investigation of pulsating heat pipe (PHP) with asymmetric non uniform heating. Asymmetric non uniform heating was applied in consideration of the characteristics of PHP that thermal performance is improved when the working fluid circulate with one directional flow. We estimated FDR value that is defined time of fluid moves to the right over total measurement time. First, we compared thermal resistance of symmetric and asymmetric heating. Thermal resistance of the PHP with asymmetric heating decreases rapidly because circulation of working fluid could be achieved earlier than symmetric heating. We improved thermal resistance through asymmetric heating. The second result is about startup time of the PHP. The startup time was estimated by gradual input method and sudden input method. The PHP with 1:1:1:1 input power ratio case is the fastest startup one because evenly distributed input power reduce time interval between redistribution and startup. Last, we compared thermal resistance with different input power ratio. As a result, 1:2:2:1 input power ratio shows best performance because the velocity of meniscus is faster than any other cases.

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