Experimental Study of Heat Transfer Enhancement of Lubricating-Oil Cooler with Integral Pin-Fin Tube

A lot of experimental research has been done to two kinds of new oil coolers using the pin-fin tube as the heat transfer elements, of which one form is longitudinal flow and the other one is crosswise flow . It was found that the heat transfer coefficient of the former one is 2.2 times as big as that of the latter one when the flow rate is (0.5kg/s) and the number of tubes is the same. The results showed that the longitudinal flow cooler with integral pin-fin tubes owns high heat transfer capacity but low pressure drop in the shell side. Especially in low flow rate the integrated performance is superior. For the integral pin-fin lubricating-oil cooler, it is suggested the flow direction should be longitudinal, which means the flow direction is parallel to the heat transfer tubes.