Published Paper Details:

Heat exchanger is important appliance in field of thermal, heat mass, fluid flow, as in nuclear reactor, steam power plant, fertilizers factory, etc. It is seen from literature that heat transfer in helical and spiral is found to be higher than U-tube due to introduction of secondary flow. For sizing of heat exchanger overall heat transfer coefficient plays very significant role. However, there is no single evidence in the literature for the comparison of overall heat transfer coefficient for same surface area under same experimental conditions which is significant for industrial heat exchanger design. Therefore present work is under taken to conduct experiments under same experimental condition for above said three different geometries under turbulent flow for same length. Experiments were carried out for different flow rates under isothermal and turbulent conditions. Overall heat transfer coefficients obtain from three different geometries like helical coil, spiral coil and u-tube coil heat exchanger of same length are reported in this work. Range of Reynolds number was kept 2000<Re<12000. From the experimental result it was found that the overall heat transfer coefficient for Spiral coil is higher than U-Tube coil and helical coil.