Experimental comparison between conventional coolants and (TiO2 water)‎ nano fluid to select the best coolant for automobiles in Iraq's summer season

الملخص EN

This work, presents nano fluids as a new coolant technology in automobile engines compared with other conventional coolants (Ethylene glycol'water (antifreeze), distilled water) experimentally.

The increase in thermal conductivity of the base fluid (water) by adding nanoparticles in certain ratios led to more absorption of heat from engine block.

The experimental results indicated that the drooping in exit engine coolant temperatures was about (18.5 %) by using (0.3 %TiOvSvater) nanofluid, and about (9 %) by using distilled water comparative with Ethylene glycol'water (50/50) at the test end.

The increasing in radiator (heat exchanger) effectiveness was about (51%) with using nanofluid, and about (29 %) with using distilled water comparative with Ethylene glycol'water (50 / 50) at the test end.

The results indicated also that the increasing in Nusselt’s number at entrance of radiator hose was about (42.8 %) with using nanofluid and about (30.5 %) with using distilled water compared with Ethylene glycol'water (50 / 50).

This led to increase convection heat transfer coefficient at entrance of radiator hose by about (65 %) with using nanofluid and about (49.5 %) with using distilled water compared with Ethylene glycol'water (50 / 50).