Fins with temperature dependent surface heat flux—II. Multi-boiling heat transfer

Abstract An analytical and experimental study is conducted for a fin when various types of boiling occur simultaneously at adjacent locations on its surface. The heat transfer coefficient is taken as a power function of wall superheat in each heat transfer mode. The temperature distribution as well as the variation of length in each section is calculated for different base temperatures. Hysteresis effects and the sudden change in total heat transfer rate are particularly noted. Experiments were carried out with 2.5 cm diameter copper rods with boiling liquids of water and isopropyl alcohol. The results from theory are compared with experimental data.