Row number effect on heat transfer in inline banks with finned tubes

Abstract

The row number effect on heat transfer for gases in cross flow over inline finned tube banks has been studied. A two stream model was used to describe the air cross flow in the tube bank. One stream was the bypass stream which exists between the tips of fins of adjacent tubes, and it was assumed to give no heat transfer to or from the tubesurface. The other was the primary stream which flows across the heat transfer surface and exchanges heat with the surface. An interchange stream existing between the bypass and primary streams. The heat transfer coefficient of the primary stream is treated as the actual heat transfer coefficient. By using the two stream assumption, a mathematical model was developed to predict the air side temperature, row by row, and to reflect the row number effect on the apparent heat transfer coefficient.