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MATERIALS, INTERFACES, AND ELECTROCHEMICAL PHENOMENA Hydrophilic Zeolite Coatings for Improved
 

Summary: MATERIALS, INTERFACES, AND ELECTROCHEMICAL PHENOMENA
Hydrophilic Zeolite Coatings for Improved
Heat Transfer: A Quantitative Analysis
Jie Liu and Guillermo Aguilar
Dept. of Mechanical Engineering, University of California, Riverside, CA 92521
Ronnie Munoz and Yushan Yan
Dept. of Chemical and Environmental Engineering, University of California, Riverside, CA 92521
DOI 10.1002/aic.11409
Published online January 24, 2008 in Wiley InterScience (www.interscience.wiley.com).
The wetting diameter and life time of a water droplet on the surface of a bare,
ZSM-5 coated, and Zeolite-A coated stainless steel 304 substrate at different initial
surface temperatures was experimentally studied. ZSM-5 and Zeolite-A coated SS-304
are more much more hydrophilic than bare stainless steel 304 as reflected by their
contact angles (278 and 08 vs. 908). The ZSM-5 and Zeolite-A coatings significantly
outperformed the bare SS-304 by decreasing the droplet life time, increasing the heat
flux and increasing the heat transfer coefficient at all initial surface temperatures stud-
ied. At the highest surface temperature studied, T0 5 2008C, ZSM-5, and Zeolite-A
coatings are shown to increase the maximum heat flux on bare SS-304 by as much as
106% and 72%, respectively. At this temperature, the maximum heat transfer coeffi-
cients on ZSM-5 and Zeolite-A coatings are improved by 470% and 530% over the

  

Source: Aguilar, Guillermo - Department of Mechanical Engineering, University of California at Riverside

 

Collections: Engineering