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Enhancement Of Pool Boiling And Evaporative Heat Transfer Using High Temperature Thermally Conductive Microporous Coatings

Ajay Gurung-2015-07-01-UTA ResearchCommons (University of Texas Arlington)
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TL;DRAbstract

The present research is an experimental study of the enhancement of pool boiling and evaporative heat transfer using high temperature thermally conductive microporous coatings. Two major types of coatings were investigated: one that is based on copper powders on copper substrate and the other on aluminum powders on aluminum substrate. Both coatings were easy to fabricate with low costs compared to conventional sintering and plasma spraying techniques, yet have high bonding strength and some of them can operate at temperatures up to 670 oC. Multiple coating options were fabricated and tested in pool boiling of water in order to optimize the coating. These coating options consisted of variations of coating composition ratio, coating thickness and powder sizes. Average powder sizes ranged from 5 µm to 110 µm, and coating thicknesses from 75 µm to 340 µm, applied on flat 1x1cm2 test heaters. The heaters were tested in the horizontal, upward-facing orientation in saturated conditions at atm

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The present research is an experimental study of the enhancement of pool boiling and evaporative heat transfer using high temperature thermally conductive microporous coatings. Two major types of coatings were investigated: one that is based on copper powders on copper substrate and the other on aluminum powders on aluminum substrate. Both coatings were easy to fabricate with low costs compared to conventional sintering and plasma spraying techniques, yet have high bonding strength and some of them can operate at temperatures up to 670 oC. Multiple coating options were fabricated and tested in pool boiling of water in order to optimize the coating. These coating options consisted of variations of coating composition ratio, coating thickness and powder sizes. Average powder sizes ranged from 5 µm to 110 µm, and coating thicknesses from 75 µm to 340 µm, applied on flat 1x1cm2 test heaters. The heaters were tested in the horizontal, upward-facing orientation in saturated conditions at atm

Keywords

Microporous materialBoilingMaterials scienceHeat transferElectrical conductorEvaporative coolerThermodynamicsComposite material

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