Abstract
This work used experimental methods to study heat transfer behavior inside a heat pipe and found that heat transfer behavior inside the heat pipe was changed due to its integration with cooling plates. This change caused the heat pipe to have copper-like heat transfer behavior. Experimental performances first built a CPU simulator with maximum heat power 300 W in accordance with the ASTM standard as heat source and measured temperature distribution by using infrared thermography and thermocouple thermometer. Observation of heat transfer behavior inside heat pipe influenced by its integration with cooling plates used color schlieren technique. A commercial CPU heat pipe cooler was also used as reference object in this work. Integration of the heat pipe with cooling plates causes the heat pipe to have the copper-like heat transfer behavior. The results indicate that rebuilding the bare heat pipe’s heat transfer behavior is the best solution for improving cooling efficiency of the heat pipe cooler.
Highlights
The general principle of heat pipe employs evaporative cooling on the heat source with the working fluid and its capillary action transports the condensed fluid back to the evaporating section
Stenger in 1966 [2] first developed the technique of capillary pumped loop (CPL) in heat pipe and Maydanik et al in 1985 originally developed the loop heat pipe (LHP) for the terrestrial solar energy market using the technique of anti-gravitation heat pipe [3]
It found that the change of heat transfer behavior inside heat pipe integrated with cooling plates is the main reason for the lack cooling efficiency
Summary
The general principle of heat pipe employs evaporative cooling on the heat source with the working fluid and its capillary action transports the condensed fluid back to the evaporating section. Most of the studies on the heat pipe cooler ignored the considerations on the heat transfer behavior change of heat pipe due to the integration with the cooling plates and discussed only its integrating structure. This work discusses the inner heat transfer property change of heat pipe integrated with cooling plates using experimental methods. It found that the change of heat transfer behavior inside heat pipe integrated with cooling plates is the main reason for the lack cooling efficiency. This work found that a new structure of heat pipe for integration with cooling plates should be designed to keep the original heat transfer behavior of bare heat pipe after integration with cooling plates [9]
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