Heat Transfer Enhancement In Concentric Tube Heat Exchanger : A Review
In this paper, the research on concentric tube heat exchanger with tangential injectors by passing nanoﬂuid on cold side for enhancing heat transfer rate is described. Diﬀerent properties of nanoﬂuid were studied and based on that, Al2O3 nanoﬂuid was selected due to its great particle stability dispersion. Range of Reynold’s number for research purpose is kept between 2500-4500. Three cases were considered in which water was to be passed through both hot and cold side, then nanofluid was to be passed through the cold side and then nanofluid was to be passed to the cold side using tangential injection. Mass flow rate was to be varied in all cases. Based on the research, when heat transfer rate is calculated is these three cases, it is expected that Nusselt number using nanoﬂuid increases about 20-30 percent over distilled water and about 10-20 percent by tangential injection. By using concentric tube heat exchanger with nanoﬂuid using tangential injection, considerable improvement in the heat enhancement factor is expected.