Cooling fins, Figure 6.15, are frequently used to improve heat transfer from walls to gases, because gases have low thermal conductivity. The fin efficiency factor, η, is defined as the ratio between the actual heat transfer and the heat transfer if the entire fin has the wall temperature Tw. The temperature obviously depends on fin dimensions (length and thickness) and on the thermal conductivity of the fin material. In order to quantify the efficiency of a fin, the temperature profile along the fin must be determined.

Transcribed Image Text:

Tw gas L 2B