Published Paper Details:

In the present-day scenario, the trend in heat exchanger design is towards higher heat transfer rates per unit volume. This is achieved by providing more surface area per unit volume of heat exchanger equipment or by decreasing the resistance to heat flow i.e. increasing the heat transfer coefficients. The present paper discusses the various techniques for enhancement of heat transfer, fabrication of equipment for forced convection heat transfer, materials for fabrications and their specifications, the effect of insertion of twisted tapes (h/d = 1 and h/d = 2) on heat transfer coefficients. The experiment revealed that at various power inputs the increase in heat transfer coefficient will be from 50% to 180% more when compared to that of the bare pipe. A comparison between the heat transfer coefficients with bare pipe and with twisted tapes is represented in the form of graphs. From the observations, a relation for Nusselts number with modified constant is derived using non-linear regression analysis for both bare pipes as well as twisted tapes.