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

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تعداد صفحات:۹

چکیده:

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.