EXPERIMENTAL INVESTIGATION TO EVALUATE THE PERFORMANCE OF HELICAL COILED TUBE HEAT EXCHANGER WITH USING TiO2 NANOFLUID

Experimental investigation of heat transfer enhancement in heat transfer coefficient of shell and helical coil tube heat exchanger with and without addition nanofluid is carried out in the present work. Experimental work is included two parts: the first one is included design of helical coil heat exchanger with optimum curvature ratio(17),an optimum helical coil pitch has been used to study the heat transfer coefficient without nanofluid. The second part is included studying the effect of using (Oxide Titanium TiO2) nanoparticle powder with 20 nm diameter is dispersed in distilled water with different volume concentrations (0.2, 0.4, 0.6, and 0.8) % by volume on heat transfer coefficient. The experimental results showed that,when nanofluid was used there is an increase in heat transfer coefficient and thermal conductivity by (20) %. An empirical correlation has been found to show the variation of Nusselt number with Dean number by using nano fluid with error of (+/- 5%).