Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.
This study aims to enhance falling film type evaporation heat
transfer on metal surfaces by coating with multi-walled carbon
nanotubes (MWCNTs). In order to do this, multi-walled carbon
nanotube/Copper (MWCNT/Cu) composite powders fabricated
and composites are sprayed on the surface of Copper plates and
are sintered. The falling type evaporation heat transfer tests were
performed under working conditions of absorption chiller for
water(Pressure: 4 mm Hg). Then the heat transfer tests were
performed with various contents of MWCNT coated specimens
and falling flow rates of refrigerants. Based on the results, it can
be inferred that evaporation heat transfer was enhanced due to
the porous structure of the surface coating and the excellent heat
transfer characteristics of the MWCNTs.