수평 실린더 표면의 착상에 대한 실험적 연구

An Experimental Study of Frost Formation on the Horizontal Cylinder

  • 백상진 (서울대학교 대학원 기계공학부) ;
  • 이윤빈 (서울대학교 대학원 기계공학부) ;
  • 노승탁 (서울대학교 공과대학 기계항공공학부)
  • 발행 : 2000.04.20

초록

In this study, thickness, density and effective thermal conductivity of frost forming on the horizontal cylinder were measured with various air temperature and humidity. Reynolds number and temperature of cooling surface are controlled 17300 and $-l5^{\circ}C$ respectively. In each case of air temperature $5^{\circ}C,\;10^{\circ}C,\;15^{\circ}C,$ varying absolute humidity, experiments were executed. In measuring frost surface temperature and thickness of frost layer, infrared thermocouples and CCD camera were used. Frost was gathered from cylinder to measure mass of frost layer. Experimental data showed that the thickness and effective thermal conductivity of the frost layer increase with respect to time. Thickness of frost layer increase with humidity increasing, and density of frost layer increase with air temperature rising. Frost growth with air temperature and density of frost layer with humidity are affected by whether dew point is below or above freezing point.

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