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A heat transfer correlation was proposed for inline-arranged high-finned tubes. This correlation was based on the Bell-model, where two stream assumption is used, the primary stream and the bypass stream. In the proposed correlation, the actual heat transfer coefficient between fin and the primary stream was assumed to be predicted by the generally accepted correlation for staggered arrangements, and a correction factor was introduced, which corrects the bypass flow effect. Comparing existing experimental data, the correction factor was determined as a function of the ratio of fin spacing to fin height and of the Reynolds number. The proposed correlation showed good agreements with experimental data of plain and also serrated fins.

A Provisional Heat Transfer Correlation for High-finned Tubes in Inline Arrangement