Increased shear, reduced wall temperatures, use of hiTRAN wire matrix inserts in systems subject to fouling

CATEGORY: FOULING MITIGATION
Proceedings of International Conference on Heat Exchanger Fouling and Cleaning, June 9-14, 2013, Budapest, Hungary
Increased shear, reduced wall temperatures, use of hiTRAN wire matrix inserts in systems subject to fouling
P. Drogemuller (1), W. Osley (1), and D. Philipp (2)
peter droegemueller@calgavin.com , william.osley@calgavin.com
1 Cal Gavin Ltd, Alcester, UK
2 Technische Universitat Braunschweig, Institute for Chemical and Thermal Process Engineering (ICTV)
Abstract
Fouling characteristics are influenced largely by the properties of the thermal and hydrodynamic boundary layers. This paper demonstrates that tube side heat transfer enhancement devices such as hiTRAN thermal systems can be used as a tool to influence both wall temperatures and wall shear stress.
Experimental results form Laser doppler Velocimetry experiments and direct wall shear measurements with hiTRAN Wire Matrix inserts are presented. These measurements were verified by CFD simulations. The results are comparable in good agreement and indicate an increase in wall shear forces when applying this insert type. The main driving force for the use of hiTRAN Elements in heat eschanger design is the substantial increase in tube side heat transfer performance. As a direct consequence of increasing the rate of heat transfer, the resulting tube wall temperature is changed and therefore the fouling behavior. In a real case crude oil fouling scenario hiTRAN is used in order to improve the overall duty of the unit with increased wall shear and reduced wall temperatures.
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