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Knut Deppert

Knut Deppert

Professor

Knut Deppert

Pool boiling heat transfer of FC-72 on pin-fin silicon surfaces with nanoparticle deposition

Author

  • Zhen Cao
  • Bin Liu
  • Calle Preger
  • Zan Wu
  • Yonghai Zhang
  • Xueli Wang
  • Maria E. Messing
  • Knut Deppert
  • Jinjia Wei
  • Bengt Sundén

Summary, in English

In the present study, two types of micro-pin–fin configurations were fabricated on silicon surfaces by a dry etching method, i.e., staggered pin fins (#1) and aligned pin fins with empty areas (#2). The micro-pin–fin surfaces were then further modified by depositing FeMn oxide nanoparticles (∼35 nm) electrostatically for 8 h and 16 h, respectively, namely #1-8h, #1-16h, #2-8h and #2-16h. Subcooled pool boiling heat transfer was experimentally studied on these surfaces at atmospheric pressure, using FC-72 as the working fluid. The results showed that in comparison to the smooth surface, pool boiling heat transfer was significantly enhanced by the micro-pin-fin surfaces and the maximum superheat was considerably decreased. Additionally, critical heat fluxes were also greatly improved, e.g., the critical heat flux on #1 was almost twice of that on the smooth surface. Generally, the nanoparticle deposition could further enhance pool boiling heat transfer, including the heat transfer coefficient and critical heat flux (CHF). High speed visualizations were taken to explore the mechanisms behind the heat transfer performance. The bubble behavior on the micro-pin–fin surfaces with and without nanoparticles was compared at low, moderate and high heat fluxes, respectively. The wickability of FC-72 on the test surfaces was measured, based on which, a modified CHF model was proposed to predict the experimental CHFs. Accordingly, a possible mechanism of CHF enhancement was described.

Department/s

  • Department of Energy Sciences
  • Solid State Physics
  • NanoLund
  • Heat Transfer

Publishing year

2018-11-01

Language

English

Pages

1019-1033

Publication/Series

International Journal of Heat and Mass Transfer

Volume

126

Document type

Journal article

Publisher

Pergamon Press Ltd.

Topic

  • Energy Engineering

Keywords

  • CHF
  • Micro pin fin
  • Nanoparticle
  • Pool boiling
  • Subcooling

Status

Published

ISBN/ISSN/Other

  • ISSN: 0017-9310