Discussion: “Heat Transfer Mechanisms During Flow Boiling in Microchannels” (Kandlikar, S. G., 2004, ASME J. Heat Transfer, 126(1), pp. 8–16)

Abstract

In the paper Kandlikar, S. G., 2004, “Heat Transfer Mechanisms During Flow Boiling in Microchannels,” ASME J. Heat Transfer, 126 (1), pp. 8–16, Kandlikar [1] derived two new nondimensional groups, K1 and K2 , relevant to flow boiling phenomenon in microchannels as follows: Display FormulaK1=(qhfg)2DρGG2DρL=(qGhfg)2ρLρG (1) Display FormulaK2=(qhfg)2DρGσ=(qhfg)2DρGσ (2) Kandlikar [1] mentioned that these two groups were able to represent some of the key flow boiling characteristics, including the critical heat flux (CHF). In his closing remarks, he mentioned that the usage of the new nondimensional groups K1 and K2 in conjunction with the Weber number (We) and the capillary number (Ca) was expected to provide a better tool for analyzing the experimental data and developing more representative models.