Stainless Steel Spiral Finned Tube

Structural Form and characteristics of heat exchange fins between Air and Gas

When there is forced convection of gas outside the tube, if the heat transfer coefficient on both sides of the tube is very small, in order to enhance heat transfer, fins should be added on both sides. If there are structural difficulties, no fins can be added on both sides. In this case, if fins are added only on one side, there is no significant effect on the increase in the amount of heat transfer.

For example, a conventional tubular air preheater is a forced convection of air inside the tube, and forced convection of the flue gas outside the tube. It belongs to the convective heat transfer between gases. The heat transfer coefficient on both sides is very low. It is very difficult to add fins in the tube. Light pipes can be used. In the heat pipe air preheater, although it is still heated by flue gas, Both the flue gas and the air flow outside the tube, so the Fin Tube can be conveniently used on both the flue gas side and the air side, so that the heat transfer amount is greatly increased.