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Date of Publication:2018-01-01

Journal:工程热物理学报

Affiliation of Author(s):化工学院

Volume:39

Issue:4

Page Number:860-865

ISSN No.:0253-231X

Abstract:In this paper, hybrid surface tubes with 4 different kinds inclined
   angle (0°, 30°,45°,60°) are designed to study the effect of surface
   wettability and gravity on dropwise condensation with non-condensable
   gases. Visual experimental system is performed to study condensation
   heat transfer performance and droplet dynamic characteristics by high
   speed camera. The results show that, hybrid surface changes condensation
   droplets off tracks,the droplets are deviate from the direction of
   gravity flushing along hydrophobic ring, with the increasing of inclined
   angel. The droplets on the hydrophobic region are merged into the
   adjacent upper and lower hydrophobic region on the inclined tube with
   60°. For hydrophobic-superhydrophobic hybrid surface tubes, when the
   non-condensable gas content is 30%, the condensation heat transfer
   decreases first, and finally increases after remains constant. The
   measured heat flux of dropwise condensation increases by 50%-65% on the
   vertical tube,by 45%-55% on the inclined tube with 60° and by 35%-55% on
   the inclined tube with 30° and 45°, compared with that of film
   condensation on the hydrophilic plain tube.

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