%0 Journal Article
%A Hsu, Wei-Ting
%A Lee, Donghwi
%A Lee, Namkyu
%A Yun, Maroosol
%A Cho, Hyung Hee
%T Enhancement of flow boiling heat transfer using heterogeneous wettability patterned surfaces with varying inter-spacing
%J International journal of heat and mass transfer
%V 164
%@ 0017-9310
%C Amsterdam [u.a.]
%I Elsevier
%M FZJ-2021-05931
%P 120596 -
%D 2021
%X This study experimentally investigated the influence of heterogeneous wettability-patterned surfaces with varying inter-spacing on flow boiling heat transfer characteristics. The test surfaces consisted of three fluorooctyltrichlorosilane hydrophobic-patterned array structures having a triangle, inverted triangle, and circular shape on a SiO2- hydrophilic substrate, with an inter-spacing of 0.75 or 1 mm. The working fluid was deionized water, and the Reynolds number was 6,000 at atmospheric pressure. Among the test surfaces, varying the inter-spacing between neighboring hydrophobic patterns slightly enhanced the heat transfer coefficient (HTC) due to changing the bubble characteristics. In terms of the shape effect of hydrophobic patterns, the heterogeneous wettability-patterned surfaces dominated the overall flow boiling heat transfer performance showing a significant increase in critical heat flux (CHF) compared to the Si surface, by 40–43%. In addition, all of the wettability test surfaces showed a markedly higher heat transfer coefficient than the Si surface, by 35–163%. This experiment is explained by analyzing the relationship between bubble lift forces and the various hydrophobic-patterned shapes in a horizontal flow channel, in an attempt to better understand flow boiling heat transfer and optimize the pattern design.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000594277500082
%R 10.1016/j.ijheatmasstransfer.2020.120596
%U https://juser.fz-juelich.de/record/904361