Heat Transfer Enhancement by Using Twisted Tape With Square Holes and Alternate Axis

An experimental and numerical study was conducted to investigate the flow friction and heat transfer performance in tube with twisted tape having circular hole at the centre, Reynolds number range of 25000?95000. The study aims at improving the heat transfer efficiency of heat exchanger. The friction factor, Nusselt number and the overall thermal performance parameters of an align, twisted tape having circular hole at the centre have been obtained and compare with the plain tube. The comparisons showed that, compared with the plain tube, the tube with twisted tape without circular hole has further improved convective heat transfer performance by about 40% and whereas lowered flow friction. The twisted tape having circular hole at the centre tube shows about 50% greater thermal performance than, twisted tape without circular hole. In this paper we are only studying the case of simple forced convection heat transfer, in which we are not using any twisted tape, we are concentrating on finding a level that from which we have to work toward enhancement process by using twisted tape, and by using twisted tape with square hole and alternate axis.