A Comparison of Heat Transfer Characteristics of Simple and Pinnate Leaf Models

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Abstract
The heat dissipation of simple and pinnate leaf models was compared in terms of boundary layer diffusion resistance to heat flux (Ra")using energy budget equations. The relationships of Ra" to length of the leaf along the path of air flow (D), width of the leaf perpendicular to the path of air flow (W), and wind velocity (V) were determined for the single leaf models by placing them in a low velocity, laminar flow wind tunnel and measuring leaf model temperatures as a function of D, W and V. The relationships of Ra" to D, V, angle of interception of air flow (.theta.) by pinnate leaf model, and distance between leaflets were investigated. Equation coefficients were determined by regression analysis. .theta. and interleaflet distnace are important parameters determining the heat transfer characteristics of pinnate leaves.

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