The heat dissipation of simple and pinnate leaf models was compared in terms of boundary layer diffusion resistance to heat flux (R''a) using energy budget equations. The relationships of R''a 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 R''a to D, V, angle of interception of air flow (θ) by pinnate leaf models, and distance between leaflets were investigated. Equation coefficients were determined by regression analysis. The results indicate that θ and interleaflet distance are important parameters determining the heat transfer characteristics of pinnate leaves.
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Balding et al. (1976) studied this question.