Experimental Study of Heat Transfer Enhancement ofIntegral Pin-fin Tube

Under the condition of lubricating-oil vertically flowing through the surface of integral pin-fin tube,the experimental investigations of heat transfer characteristics were carried out.Effects of pitch and height of fins,machining direction,inlet temperature of lubricating-oil and velocity of cooling water on heat transfer characteristic were analyzed.In these experiments,total heat transfer coefficient of integral pin-fin tube reached 200~1470 W/m²ˇK,which increased 1~4 times as compared with the smooth tube.Experi-mental results showed that the integral pin-fin tube was a new kind of enhanced tube fitting for high-viscosity fluid.