Experimental study of frosting on different wettability surfaces under magnetic field |
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Authors: | SONG Lichao QIN Yan LI Weizhong |
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Affiliation: | School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China |
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Abstract: | The frosting laws of three kinds of wettable surfaces under different magnetic field strengths were studied under cold surface temperature Tw=-10℃ and -30℃, environmental relative humidity RH=60% and 80%. Through visual observation method,image binarization is processed and calculated,the effect of frost morphology,water droplets diameter,water droplets crystallization time,water droplets coverage,frost crystal coverage,frost layer thickness and frost density under the different magnetic field intensity and surface contact angle are well explained. The results showed that adding magnetic field in combination with hydrophobic surface,the diameter of water droplets decreases by about 40%, and the crystallization time is prolonged by more than 500 s,the distribution of condensate droplets is more sparse. Frost thickness and frost density decrease as the increase of magnetic field strength and surface contact angle,providing possibility of restrain the frosting effectively. As the temperature of the cold surface decreases and the relative humidity increases, the influence of the surface properties and the external magnetic field on the frosting process decreases. |
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Keywords: | magnetic field hydrophilic/hydrophobic surface phase change heat transfer thermodynamics restrain frosting |
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