Experimental study of frost growth on a horizontal cold surface under forced convection |
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Authors: | Lingyan Huang Zhongliang Liu Yaomin Liu Yujun Gou |
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Affiliation: | 1.Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Education Commission, College of Environmental and Energy Engineering,Beijing University of Technology,Beijing,China |
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Abstract: | Frost formation on a horizontal copper surface under low air temperature and forced convection conditions is investigated
experimentally. Both the frost crystals pattern and the frost layer thickness formed on the cold plate are compared under
different experimental conditions. The environmental variables considered in this study include the ambient temperature (T
∞
), air relative humidity (φ), and velocity (v), as well as the cold surface temperature (Tw). The tested ranges are −5≤T
∞
≤5 °C, 50%≤ φ≤80%, 2.2≤v≤8.0 m/s, −16.8≤T
w
≤−25.5 °C. The experimental results show the cold surface temperature and the air relative humidity have obvious effects on
the frost growth: the frost layer thickness increases strongly with the decreasing cold surface temperature and increasing
air relative humidity. The air temperature and air velocity or Reynolds number are also important factors affecting the frost
crystals’ growth and thickness. With the increase of the air temperature and velocity, the frost crystals become denser, and
the frost layer thickness become thicker, but this trend becomes weaker under higher air temperature and velocity. |
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Keywords: | |
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