Influence of Surface Defects and Aging of Coated Surfaces on Fouling Behavior

Autor: Wolfgang Augustin, Stephan Scholl, T. Geddert
Rok vydání: 2011
Předmět:
Zdroj: Heat Transfer Engineering. 32:300-306
ISSN: 1521-0537
0145-7632
DOI: 10.1080/01457632.2010.495629
Popis: To avoid the negative effects caused by fouling in heat exchanger equipment, the heat exchanger surface can be modified energetically or mechanically. Thus, mechanical, chemical, and thermal stability of the coatings with respect to the fouling and cleaning conditions is crucial. The surface is typically characterized by the measurement of the contact angles of different wetting fluids to calculate surface energy and tactile roughness measurements. The influence of several cleaning and fouling cycles on surface energy and the composition of the coatings has been investigated. The experimental investigation of different cleaning methods from acid to base solution displays the influence of the interface reactions on the surface energy. Structural analysis of the plasma-activated chemical vapor deposition (PACVD) coatings show a build-in of oxygen inside the a-C:H matrix with time, resulting in higher surface energies and an increase of polar interactions. Also, structural defects of the coatings have been a...
Databáze: OpenAIRE
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