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

Cao, Zhen LU ; Liu, Bin; Preger, Calle LU ; Wu, Zan LU ; Zhang, Yonghai; Wang, Xueli LU ; Messing, Maria E. LU ; Deppert, Knut LU ; Wei, Jinjia and Sundén, Bengt LU (2018) In International Journal of Heat and Mass Transfer 126. p.1019-1033
Abstract

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,... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CHF, Micro pin fin, Nanoparticle, Pool boiling, Subcooling
in
International Journal of Heat and Mass Transfer
volume
126
pages
15 pages
publisher
Pergamon
external identifiers
  • scopus:85047604874
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2018.05.033
language
English
LU publication?
yes
id
43d849c6-3fcc-4e1f-88e5-f92f37327502
date added to LUP
2018-06-11 09:52:31
date last changed
2018-06-11 09:52:31
@article{43d849c6-3fcc-4e1f-88e5-f92f37327502,
  abstract     = {<p>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.</p>},
  author       = {Cao, Zhen and Liu, Bin and Preger, Calle and Wu, Zan and Zhang, Yonghai and Wang, Xueli and Messing, Maria E. and Deppert, Knut and Wei, Jinjia and Sundén, Bengt},
  issn         = {0017-9310},
  keyword      = {CHF,Micro pin fin,Nanoparticle,Pool boiling,Subcooling},
  language     = {eng},
  month        = {11},
  pages        = {1019--1033},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Pool boiling heat transfer of FC-72 on pin-fin silicon surfaces with nanoparticle deposition},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2018.05.033},
  volume       = {126},
  year         = {2018},
}