Condensation Heat Transfer Enhancement on Surfaces with Interlaced Wettability
Date Issued
2015
Date
2015
Author(s)
Lee, You-An
Abstract
This study investigated the effect of surfaces with superhydrophobicity-based interlaced wettability on steam–air mixture condensation. Experiments were conducted on various types of surface with different modified strip widths under downward-facing horizontal and vertical surface orientations. The experimental results revealed that the condensation heat-transfer on surfaces with interlaced wettability could be highly influenced by the surface pattern, surface orientation, wall subcooling, and the existence of NCGs. Opposite trends of heat transfer were observed under different surface orientation. The experimental data of horizontal surfaces showed that the heat transfer can be enhanced when the width of the modified surperhydrophobic strips getting wider, while the narrower modified strips would increase the heat transfer more efficiently for vertical surfaces. In addition, a two-dimensional disturbance of the boundary layer imposed by NCGs is proposed, holding the potential to further heat transfer enhancement for steam-air condensation, especially in the situation without the sweeping of condensates under the gravity force. Such the facts imply that the potential of the interlaced surface could be further improved and applied if considering both the surface pattern and the operating conditions carefully.
Subjects
condensation heat transfer
surface modification
interlaced wettability
Type
thesis
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