Empirical correlations for lubricant side heat transfer and friction characteristics of the HPD type steel offset strip fins

This study presents the empirical correlations describing the lubricant side heat transfer and friction characteristics of the High Pressure Direction type steel offset strip fin pattern. A total of 36 samples containing approximately 523 data points are used in the regression analysis. The proposed heat transfer correlation can describe all test data within ± 10% with a mean deviation of 4.01% while the proposed friction correlation can describe 97.8% of all experimental data within ± 15% with a mean deviation of 5.68% in the low Reynolds number range of 30–500.