Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.
Preliminary investigations are done to cater the possibility of
the use of the polyurethane coating for the pool boiling heat
transfer augmentation. Experiments have been done on the
bare stainless steel heater and stainless steel heaters coated
with polyurethane coatings of different thicknesses, by boiling
deionised water at constant atmospheric pressure. Contact
angle formed by the deionised water over the test specimen
are experimentally measured and from these values the solidliquid
surface energy values have been calculated. It has been
found that the polyurethane coating has increased the solidliquid
surface energy and the heat transfer. Recommendations
for the future inspections with relevance to finding an ideal
heat transfer enhancer coating are putforth.