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Heat Exchanger Fouling and Cleaning VII
July 1-6, 2007 - Tomar, Portugal
| Editors: |
Hans Müller-Steinhagen, Institute of Technical Thermodynamics, German Aerospace Centre (DLR)
and Institute for Thermodynamics and Thermal Engineering, University of Stuttgart, Germany
M. Reza Malayeri, University of Stuttgart, Germany
A. Paul Watkinson, The University of British Columbia, Canada |
The articles for these proceedings are peer-reviewed.
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EXTENDING THE INDUCTION PERIOD OF CRYSTALLIZATION FOULING THROUGH SURFACE COATING
T. Geddert, Institute for Chemical and Thermal Process Engineering, Langer Kamp 7, 38106 Braunschweig (Germany)
I. Bialuch, Fraunhofer Institute for Surface Engineering and Thin Films, Bienroder Weg 54E, 38108 Braunschweig (Germany)
W. Augustin, Institute for Chemical and Thermal Process Engineering, Langer Kamp 7, 38106 Braunschweig (Germany)
S. Scholl, Institute for Chemical and Thermal Process Engineering, Langer Kamp 7, 38106 Braunschweig (Germany)
ABSTRACT:
To minimize the negative effects of scale formation in
heat exchangers, new anti-fouling strategies are focusing on
the modification of heat transfer surfaces. These
modifications should lead to tailored made surfaces for
different technical applications. Aim of this surface
modification is the extension of the induction period to
minimize the negative effects of fouling and maximize the
endurance of the heat exchanger. To achieve such, different
surface coatings on stainless steel were investigated in
respect of fouling tendency. The effect of flow velocity
respectively Reynolds number on the induction time of
CaSO4 crystallization fouling were tested in different test
units. Diamond like carbon coatings are extending the
induction time in every measured flow velocity. At higher
Reynolds numbers, the effect of different surface
crystallization due to energetic modification is reduced
because of the dominating effect of the low adhesive
surface. Thus the induction time can be extended by the
factor of 2 for low fluid velocities (DLC or SICON®) and
more than 20 for higher Reynolds numbers (DLC and
SICON®). The combination of limited nucleation spots due
to electro-chemical treatment of the substrate before coating
can be a tailored made surface with maximum induction
time for crystallization fouling.
T. Geddert, I. Bialuch, W. Augustin, and S. Scholl, "EXTENDING THE INDUCTION PERIOD OF CRYSTALLIZATION FOULING THROUGH SURFACE COATING" in "Heat Exchanger Fouling and Cleaning VII", Hans Müller-Steinhagen, Institute of Technical Thermodynamics, German Aerospace Centre (DLR)
and Institute for Thermodynamics and Thermal Engineering, University of Stuttgart, Germany
M. Reza Malayeri, University of Stuttgart, Germany
A. Paul Watkinson, The University of British Columbia, Canada
Eds, ECI
Symposium Series, Volume RP5 (2007). http://services.bepress.com/eci/heatexchanger2007/31
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