Abstrakt

Experimental Studies of Thermal Transport in Heat Transfer Fluids Using Infrared Thermography

Murugalakshmi G.K, Selvakumar N

The efficiency of the cooling system is critical in industrial sectors could damage the electrical equipments due to poor thermal conductivity. Nanofluids are novel class of fluids, prepared by dispersing the nanoparticles in liquids like water, ethylene glycol, oil and oleic acid etc., to increase the thermal conductivity of heated substrates. The liquid droplets are placed on the substrate and are heated to various levels, thereby hydrothermal waves are induced and it is observed in thin fluid layers. Using Infrared Thermography technique heat transfer, drop radius, drying of substrates and its wetting angle are measured. It is a non-contact, non-destructive test measurement technique which detects the emitted infrared radiation from the substrate above absolute zero according to black body radiation law. Three different metal oxide nanofluids (Copper oxide, Iron oxide and Aluminium oxide) were prepared and nanoparticles are characterized using SEM, AFM and FT-IR. Using TGA and DTA, thermal stability and weight loss of the nanoparticles are studied. Copper Oxide nano fluid shows reduced weight loss, enhanced thermal stability and thermal conductivity when compared to other fluids.