A general correlation for flat tube-and-fin radiator based on parametric CFD analysis

Abstract

The work numerically predicted a Fin-and-flat tube heat exchanger with an experimental validation. The unit was firstly redefined as five basic modules. Based on L9(34) orthogonal tests involving vertical fin spacing, horizontal tube spacing, fin length, and fin thickness, the formed overdetermined equations were solved and discussed by regression and F significance test. After a derivation, the general correlation was compared with published, fitted, and numerical results. Finally, its applicable range was numerically clarified. It is found that the maximum 3.62% error of heat transfer coefficient and 4.51% error of pressure loss, respectively. The fitted correlation can predict over 88.9% of j under 3.10% average error and 96.30% of f under 2.33%. 2.6-4.0 mm vertical spacing, 16-100 mm fin length, 5-8 mm horizontal spacing, 0.03-0.09 mm fin thickness, 3-4.4 mm hydraulic diameter, 1-5 tube rows, and Reynolds number of 550-3290 might work for the efficient deployment of the general correlation.