Natural convection from leaves at realistic Grashof numbers |
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Authors: | MICHAEL DIXON JOHN GRACE |
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Affiliation: | Department of Forestry and Natural Resources, University of Edinburgh, Edinburgh EH9 3JU, U.K. |
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Abstract: | Abstract. The boundary layer resistance of model leaves was measured in still air, at a range of leaf-to-air temperature differences. The results were compared to those calculated from standard formulae for natural convection. The agreement between observed and calculated was only satisfactory when Grashof numbers exceeded about 105. At the lower Grashof numbers, which often prevail in nature, the observed rates of heat transfer considerably exceeded those calculated. |
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Keywords: | Acer, Quercus heal transfer natural convection Grashof number boundary layer resistance |
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