Effect of surface properties and flow distribution on fouling of heat transfer surfaces.
Fouling and corrosion are probably the major engineering problems in process plants
and in heat exchanger design and operation. Fouling is the formation of undesired
deposits on heat transfer surfaces and corrosion is the deterioration and loss of material.
The occurrence of these processes has strong adverse effects on the performance of heat
exchangers and operating plants.
In the present work, the influence of surface properties (surface free energy & surface
roughness) on crystallisation fouling, biological fouling, wax deposition and corrosion
has been investigated. In order to carry out the experimental investigations on
crystallisation and biological fouling, the surfaces of several pairs of Alfa Laval M3
stainless steel heat exchanger plates have been modified. The experiments for the
investigation on paraffin deposition on modified surfaces have been carried out using
stainless steel tubes with various surface modifications, to change surface energy and
roughness. The corrosion tests have been performed with modified carbon steel
Test samples have been treated using different surface treatment technologies, namely
ion beam implantation, magnetron & arc ion sputtering, carbo-nitriding & oxidising,
electroplating, chemical vapour deposition, commercial coatings and Ni-P-PTFE
coating. These treatment techniques have been used for the reduction of the surface free
energy of the test surfaces. Two pairs of plates have been pickled and electropolished in
order to achieve rougher and smoother surface conditions compared to the untreated