Experimental Study of Force Convective Heat Transfer for Cuo – Water nanofluid flow in a Tubular Heat Exchanger

Nanofluids are suspensions of metallic or nonmetallic nanopowders in based liquid which show modified heat transfer treatment in various applications. In the present paper, we investigate the effect of a nanofluid on the heat transfer coefficient in a tubular heat exchanger. Samples of copper oxide and water suspension nanofluid are prepared in low concentrations about 1%, 2%, 4%wt and experiments are carried out for prediction of the heat transfer coefficient in a noval design tubular heat exchanger with using these samples as a hot fluid. As a result, using of CuO-Water nanofluid cause an increase in the heat transfer coefficient more than 30% compared with the result obtained from distilled water. Also, the effect of inlet temperature of nanofluid on the performance of the heat exchanger in the laminar flow has been studied. A careful examination of results reveals that by increasing inlet temperature, the Nusselt number is decreasing. Therefore, in lower temperatures nanofluids are more efficient than high temperature.

Keywords:

Nanofluid , tubular , Heat exchanger , Heat transfer coefficient