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Technical Brief

Development of a Durable Vapor Phase Deposited Superhydrohobic Coating for Steam Cycle Power Generation Condenser Tubes

[+] Author and Article Information
Christopher Duron

Dept. of Mechanical Eng., Auburn University, Auburn, Alabama, USA, 36849
duroncm@auburn.edu

Jie Zhong

Dept. of Chemical Eng., Auburn University, Auburn, Alabama, USA, 36849
jzz0009@auburn.edu

Allan E. David

Dept. of Chemical Eng. Auburn University, Auburn, Alabama, USA, 36849
aedavid@auburn.edu

William R. Ashurst

Dept. of Chemical Eng. Auburn University, Auburn, Alabama, USA, 36849
ashurwr@auburn.edu

Sushil H. Bhavnani

Dept. of Mechanical Eng. Auburn University, Auburn, Alabama, USA, 36849
bhavnsh@auburn.edu

Jacob R. Morris

Dept. of Mechanical Eng., Auburn University, Auburn, Alabama, USA, 36849
jzm0023@auburn.edu

Andrew C. Bates

Dept. of Mechanical Eng., Auburn University, Auburn, Alabama, USA, 36849
acb0048@auburn.edu

1Corresponding author.

ASME doi:10.1115/1.4039783 History: Received July 04, 2017; Revised February 06, 2018

Abstract

The condenser performance benefits afforded by dropwise condensation have long been unattainable in steam cycle power plant condensers due to the unavailability of durable and long lasting wetting inhibiting surface treatments. However, recent work in superhydrophobic coating technology shows promise that durable coatings appropriate for use on condenser tubes in steam cycle power generation systems may soon become a reality. This work presents a nano-scale, vapor phase deposited superhydrophobic coating with improved durability comprised of several layers of rough alumina nano-particles and catalyzed silica with a finishing layer of perfluorinated silane. This coating was applied to solid, hemi-cylindrical test surfaces fabricated from several common condenser tube materials used in power generation system condensers: Titanium, Admiralty brass, Cupronickel, and Sea Cure stainless steel condenser tube materials as well as 304 stainless steel stock. The development evolution of the coating and its effect on condensation behavior on the above materials are presented. Results show that the performance enhancement, measured in rate of heat transfer spikes corresponding to condensate roll-off events, was best for the titanium surface which produced 64% more events than the next most active material when coated using the most durable surface treatment tested in this work.

Copyright (c) 2018 by ASME
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