Free Convection of Water-Al sub(2)O sub(3) Nanofluid from Horizontal Porous Coated Tube

Nanofluids are expected to enhance heat transfer in many thermal systems. Present efforts are concentrated on boiling heat transfer of nanofluids, although single phase convection is of key importance in various appliances such as car radiators or heating systems. This paper presents experimental results of heat transfer during free convection of water-Al sub(3)O sub(3) nanofluid from horizontal tube covered with metallic porous coating. Contrary to theoretical considerations deterioration of heat transfer was observed.