Optimal spacing for cylinders in crossflow forced convection
This paper throws light to a new fundamental aspect of the heat transfer performance of a bundle of parallel cylinders with crossflow forced convection, namely, the maximization of the thermal contact between the bundle and the fluid, when the volume occupied by the bundle is fixed. It is shown that the ratio between cylinder-to-cylinder spacing (S) and cylinder diameter (D) can be predicted based on a simple theory and that contrary to the conclusion of Jubran et al. (1993) the Sopt/D ratio is not a constant. It is also shown that, if the theory is known, all the empirical information necessary for predicting Sopt/D accurately is already available in the large volume of heat and fluid flow data published for cylinders in crossflow.
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