Effect of h-BN coating on nucleate boiling heat transfer performance in pool boiling
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Author list: Kim J.M., Kong B., Lee H.-B.-R., Wongwises S., Ahn H.S.
Publisher: Elsevier
Publication year: 2018
Journal: Experimental Thermal and Fluid Science (0894-1777)
Volume number: 98
Start page: 12
End page: 19
Number of pages: 8
ISSN: 0894-1777
eISSN: 1879-2286
Languages: English-Great Britain (EN-GB)
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Abstract
We report a simple and efficient surface modulation method for enhancing boiling heat transfer performance using a commercial spray can of boron nitride (h-BN). The surface was prepared by successive spraying, drying, and annealing, resulting in a thin coating of film composed of closely packed h-BN particles. We controlled the thickness of the coating by varying the number of repetitions of the spraying and drying steps, and evaluated the effects on boiling performance. We observed a trade-off between the boiling heat transfer coefficient (HTC) and the critical heat flux (CHF) as the thickness varied. We obtained the largest improvement from the thinnest b-BN coating, at 8 μm, which yielded an HTC enhancement of 160% compared with the uncoated silicon surface. We obtained a similar improvement to the CHF. Meanwhile, the surface coated with the thickest layer, 27 μm of h-BN, exhibited the largest CHF enhancement, 70%, but the worst HTC performance, increasing the HTC of the silicon wafer only by 9%. We attributed the enhancement in the HTC performance to the higher nucleate site density on the h-BN coated surface. However, the thermal properties of the surface were worse than those of uncoated silicon, leading to degradation in the HTC with increasing thickness. © 2018 Elsevier Inc.
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