Visualization experiments on the performance of mesh-wick heat pipes with differing wick wettability
International Journal of Heat and Mass Transfer(2017)
Abstract
•Visualization experiments performed for copper mesh heat pipes with various surface wettabilities.•Untreated wick exhibits best performances in both total thermal resistance and Qmax.•In a hydrophobic condenser, water level is lower and large drops grow and rupture on exposed area.•Large round condensing drops on a hydrophobic condenser act as heavy thermal barriers to raise Rc.•Hydrophilic treatment on evaporator fails to enlarge Qmax due to increased liquid flow hindrance.
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Key words
Heat pipe,Evaporator resistance,Condenser resistance,Dropwise condensation,Wettability,Hydrophilic treatment,Hydrophobic treatment
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