Abstract
An experimental investigation of heat transfer around four cylinders closely spaced in a cross-flow of air has been conducted. The cylinders are settled in tandem with equal distances between centers. Their inline pitch ratio is in the range of 1.15 ≤ c d ≤ 3.4 ( c = distance between cylinders' centers, d = cylinder diameter); the Reynolds number ranges from 10 4 to 5 × 10 4. It is found that there exists a critical Reynolds number Red c at which the heat transfer behavior changes drastically, and is correlated with the in-line pitch ratio by Red c = 1.14 × 10 5 ( c d) −5.84 . Variations of characteristic features of the mean and local Nusselt numbers are discussed in relation to the length of the vortex formation region behind the cylinder.
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