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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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INFLUENCE OF DIFFERENT SURFACE MATERIALS ON NUCLEATION AND CRYSTAL GROWTH IN HEAT EXCHANGERS
T. Geddert, Technical University of Braunschweig, Institute for Chemical and Thermal Process Engineering, Langer Kamp 7, 38106 Braunschweig, Germany
S. Kipp, Technical University of Braunschweig, Institute for Physical and Theoretical Chemistry, Hans-Sommer-Strasse 10, 38106 Braunschweig, Germany
W. Augustin, Technical University of Braunschweig, Institute for Chemical and Thermal Process Engineering, Langer Kamp 7, 38106 Braunschweig, Germany
S. Scholl, Technical University of Braunschweig, Institute for Chemical and Thermal Process Engineering, Langer Kamp 7, 38106 Braunschweig, Germany
ABSTRACT:
The influence of different materials on the fouling
tendency in saline calcium sulfate solution was investigated.
The effects of the untreated material on the crystallization
process have been studied experimentally in the micro- and
macroscopic scale. The crystallization in the induction
period was visualized with SEM and AFM to locate
preferred nucleation spots and to visualize the crystal
growth. The different materials are showing different crystal
growth behavior (number and size of the crystals). These
results are corresponding with the macroscopic fouling
results with limited shear stress. Also different roughness
values on stainless steel have been studied with respect to
fouling tendency. The induction time can be extended with
smoother surfaces due to the limitation of nucleation spots.
With higher fluid velocities, the adhesion of the forming
crystals on the heat transfer surface dominates the length of
the induction time.
T. Geddert, S. Kipp, W. Augustin, and S. Scholl, "INFLUENCE OF DIFFERENT SURFACE MATERIALS ON NUCLEATION AND CRYSTAL GROWTH IN HEAT EXCHANGERS" 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/heatexchanger2007/32
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