ENHANCEMENT OF HEAT TRANSFER IN A PIPE FLOW USING A SWIRLING PERFORATED TWISTED TAPE INSERT

Abstract

With the advancement of science and technology heat transfer enhancement has become an important term in the field of engineering research since the effectiveness of heat exchangers are increasing through suitable heat transfer enhancement techniques. The purpose of research paper is to increase the heat transfer coefficient by operating the heat exchangers at smaller revolution per minute. This signifies an achievement of reduction of pressure drop corresponding to less operating cost. However different researches were done by using various enhancement techniques. This study has used two types of rotating perforated twisted tape insert to observe the various heat transfer coefficient, heat transfer rate and heat transfer enhancement efficiency. One tape was fully twisted and another tape was partially twisted. The shape of the twisted tape creates turbulence flow. The turbulence flow (swirl flow) generated by twisted tape promotes greater mixing and high heat transfer coefficients. An arrangement scheme has been developed for the experimental investigation. For remarking the rate of change of heat transfer, temperature has been measured numerically through the temperature sensors with various flow rates and RPM. The volume flow rate was varied from 10.3448276 LPM to 21.045574 LPM and the rotation of the perforated twisted tape was varied from 50 RPM to 400 RPM. Experiment demonstrates the effectiveness of the results of the proposed approaches. It is shown that the suggested method of heat transfer enhancements is much more effective than existing methods, since it results in an increase in heat transfer area and also an increase in the heat transfer coefficient and reduction of cost in the industrial sectors.