Abstract
The coefficient for heat transfer from apple tree leaves was measured from the energy balance of leaves which were prevented from transpiring by applying ‘Vaseline’ (petroleum jelly). Vaseline had negligible effect on the absorption of short-wave radiation by the leaves. The Nusselt number (Nu) describing heat flux from a leaf in terms of its average temperature was related to Reynolds numbers (Re) in the range 103 to 104 by Nu = 0.46 Re0.54 Pr0.33, where Pr is the Prandtl number. This supports Landsberg and Powell's (1973) wind-tunnel results for transfer from leaves subject to mutual interference.
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References
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Thorpe, M.R., Butler, D.R. Heat transfer coefficients for leaves on orchard apple trees. Boundary-Layer Meteorol 12, 61–73 (1977). https://doi.org/10.1007/BF00116398
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DOI: https://doi.org/10.1007/BF00116398