Comments on 'boiling heat transfer in rectangular microchannels with reentrant cavities'

摘要

Kosar et al. [1] obtained a relation for the transition boundary between the nucleate and convective boiling in terms of the Boiling number (Bo). Their relation was Re_(cr)= 163.59-2.73 × 10~4Bo (1) On the other hand, Kosar et al. [2] found that the transition boundary between the nucleate and convective boiling in terms of the Boiling number (Bo) at reduced exit pressure of 47 kPa was lower than that at atmospheric exit pressure. This implied that the Boiling number (Bo) alone was insufficient to provide a generalized correlation for the two distinct exit pressures. As a result, the researchers used the K_1 number suggested by Kandlikar [3) K_1 = Bo~2 (ρL/ρG) instead of the Boiling number (Bo), in an attempt to find a commonality between the two sets of data (atmospheric and reduced exit pressure of 47 kPa) because the K_1 number captured more properly the transition Reynolds number (Re_(cr)) than the Bo number.