PMID- 32106423
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20200928
IS  - 2072-666X (Print)
IS  - 2072-666X (Electronic)
IS  - 2072-666X (Linking)
VI  - 11
IP  - 3
DP  - 2020 Feb 25
TI  - Measurement of Heat Transfer from Anodic Oxide Film on Aluminum in High Knudsen 
      Number Flows.
LID - 10.3390/mi11030234 [doi]
LID - 234
AB  - The heat transfer in vacuum depends on the gas-surface interaction. In this 
      study, the heat flux from anodic oxide films on aluminum with different anodizing 
      times through a gas confined between two surfaces with different temperatures was 
      studied. We prepared a non-treated surface, a surface with a normal anodizing 
      time of 30 min, and a surface with 90 min, where the formed film would partially 
      dissolve by long time exposure to the solution. The formation of the films was 
      checked by electrical resistance. Scanning electron microscope (SEM) images were 
      obtained for the three sample surfaces. Even though it was difficult to observe 
      the hexagonal cylindrical cell structures on anodic oxide films, the 30 min 
      sample surface was shown to be rough, and it was relatively smooth and powdery 
      for the 90 min sample surface. The heat fluxes from three sample surfaces were 
      measured from the free-molecular to near free-molecular flow regimes, and 
      analyzed to obtain the energy accommodation coefficients. The heat fluxes were 
      well fitted by the fitting curves. The energy accommodation coefficients for both 
      helium and argon increased by anodizing an aluminum sample surface, while they 
      decreased with increasing the anodizing time up to 90 min indicating the 
      dissolution of the film.
FAU - Yamaguchi, Hiroki
AU  - Yamaguchi H
AUID- ORCID: 0000-0002-3808-2879
AD  - Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, 
      Nagoya 464-8603, Japan.
FAU - Kito, Kenji
AU  - Kito K
AD  - Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, 
      Nagoya 464-8603, Japan.
LA  - eng
GR  - 18K03946/Japan Society for the Promotion of Science/
PT  - Journal Article
DEP - 20200225
PL  - Switzerland
TA  - Micromachines (Basel)
JT  - Micromachines
JID - 101640903
PMC - PMC7143282
OTO - NOTNLM
OT  - gas-surface interaction
OT  - thermal accommodation coefficient
OT  - vacuum
COIS- The authors declare no conflict of interest.
EDAT- 2020/02/29 06:00
MHDA- 2020/02/29 06:01
PMCR- 2020/02/25
CRDT- 2020/02/29 06:00
PHST- 2020/01/24 00:00 [received]
PHST- 2020/02/19 00:00 [revised]
PHST- 2020/02/24 00:00 [accepted]
PHST- 2020/02/29 06:00 [entrez]
PHST- 2020/02/29 06:00 [pubmed]
PHST- 2020/02/29 06:01 [medline]
PHST- 2020/02/25 00:00 [pmc-release]
AID - mi11030234 [pii]
AID - micromachines-11-00234 [pii]
AID - 10.3390/mi11030234 [doi]
PST - epublish
SO  - Micromachines (Basel). 2020 Feb 25;11(3):234. doi: 10.3390/mi11030234.