Numerical study on the effects of inertia and wettability on subcooled flow boiling in microchannels

Jonghyun Kim, Joon Sang Lee

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24 Citations (Scopus)


This study aims to explore the effects of wettability and inertia on heat transfer during flow boiling in a microchannel. For this purpose, we numerically characterized a nucleated bubble and its heat transfer rate on heated surfaces with different wettabilities under specific mass fluxes. The numerical results were consistent with those obtained in previous experimental studies. Under low mass fluxes (20–100 kg/m2s), the critical heat flux (CHF) was higher in the hydrophilic channel than in the hydrophobic channel. However, under high mass fluxes (200–500 kg/m2s), this trend reversed. Increasing the mass flow rate also delayed the incipient boiling. This behavior is strongly related to the inertia force and surface tension. In conclusion, the hydrophilic and hydrophobic channels enhanced the CHF at low and high mass fluxes, respectively.

Original languageEnglish
Pages (from-to)175-183
Number of pages9
JournalApplied Thermal Engineering
Publication statusPublished - 2019 Apr

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korean Government (MSIP) (No. 2015R1A5A1037668 ). Appendix A

Publisher Copyright:
© 2019

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering


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