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TECHNICAL PAPERS: Melting and Freezing

Experimental Study on Frost Structure on Surfaces With Different Hydrophilicity: Density and Thermal Conductivity

[+] Author and Article Information
Jongmin Shin, Alexei V. Tikhonov, Cheolhwan Kim

DA Research Laboratory, LG Electronics Company, 391-2, Ga Eum Jeong Dong, Changwon, Kyoung Nam, 641-711 Republic of Korea

J. Heat Transfer 125(1), 84-94 (Jan 29, 2003) (11 pages) doi:10.1115/1.1518496 History: Received September 04, 2001; Revised July 19, 2002; Online January 29, 2003
Copyright © 2003 by ASME
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Figures

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Schematic diagram of test apparatus: (a) setup, and (b) design of the test sample with location of thermocouples and design of the sensor for frost thickness acquisition
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Flow patterns on different surfaces ((a), (b), and (c)—water spray results; (d), (e), and (f)—initial frost after 2 min of generation): (a) DCA=23 deg (uniform: water forms a thin film on the surface, which can’t be observed); (b) DCA=55 deg (pools: water forms small pools on the surface); (c) DCA=88 deg (droplets: water in a form of small droplets can be observed on the surface); (d) DCA=23 deg (uniform: frost deposits as a thin film); (e) DCA=55 deg (nearly uniform: few frost crystals have large dimensions); and (f) DCA=88 deg (rough: fronts layer obviously contains large crystals).
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Results of direct temperature measurements: (a) temperature distribution inside frost layer during frost deposition on the surface with DCA=88 deg, (b) test data on frost thickness versus time
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Frost test results: (a) thickness, (b) mass deposition, (c) density, and (d) thermal conductivity
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Distribution of local frost thermal conductivities along the frost layer during 240 min test run. (a) DCA=88 deg, (b) DCA=55 deg, (c) DCA=23 deg.
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Average frost thermal conductivity: (a) results of experiments and (b) correlation of test data
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Typical frost profiles: (a) droplet freezing, (b) crystal growth period or frost columns growth, (c) three-dimensional growth of frost structure, (d) seepage period, and (e) images of frost structure for 30, 60, 120, 180 and 240 min of frost deposition on surfaces with different DCA
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Classification of test methods for frost properties study: (a) for frost density, and (b) for frost thermal conductivity
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Comparison of present test data on frost thermal conductivity verses frost density with predictions based on literature expression

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