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Download The Evaporation Mechanism in the Wick of Copper Heat Pipes by Shwin-Chung Wong PDF

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By Shwin-Chung Wong

This booklet discusses the evaporation mechanism within the wick of copper warmth pipes. The investigations are in accordance with contemporary visualization experiments for working horizontal flat-plate warmth pipes.

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Extra info for The Evaporation Mechanism in the Wick of Copper Heat Pipes

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Then, different working fluids, including water, methanol and acetone, are investigated using an identical two-layer mesh wick under various copper surface wettabilities. The following conclusions are obtained: 1. Quiescent surface evaporation prevails for sintered-mesh or sintered-powder wicks working with water. For either irregular powders or spherical powders, no nucleate boiling is observed up to heat flux larger than 100 W/cm2 in spite of the abundant nucleation sites. 7 °C obtained in this work is insufficient to invoke nucleate boiling.

C. -H. -W. Chang, Evaporation resistance measurement and visualization for sintered copper-powder evaporator in operating flat-plate heat pipes. Int. J. Heat Mass Transf. -C. -C. -H. Liou, Visualization and evaporator resistance measurement in heat pipes charged with water, methanol or acetone. Int. J. Therm. Sci. -C. -C. Lin, Effect of copper surface wettability on the evaporation performance of heat pipes. Int. J. Heat Mass Transf. -C. -C. -D. -L. Han, A novel vapor chamber and its performance.

For methanol, the nucleation intensity was too weak to be detected. For most of the cases, nucleate boiling was suppressed beyond qmax. The weak and slow bubbling process did not likely block the capillary flow. Consequently, the heat transfer in the present methanol and acetone tests should still be capillarylimited. More discussion about the behavior and effects of the nucleate boiling will be made later on together with the superheat data. 9 ml. These temperatures are at 18–28 °C for methanol and acetone before local dryout.

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