Paper Details

Heat transfer augmentation techniques are used to increase rate of heat transfer without affecting much onoverall performance of system. This report presents the result obtained from experimental investigation of heat transferand friction factor characteristics in horizontal tube by means of twisted tape inserts of various twist ratios with waterand as working fluid. The experiments are conducted in Raynolds number range 1100 to 2500 with twisted tape inserts ofdifferent twist ratio(y=H/D) in the range 6.12 to 8.34. The inner tube is made of copper with inner and outer diameter19.5 mm and 24.5 mm respectively. Twisted tape is made up of stainless steel of 1 mm thickness and 1900 mm length. Hotand cold fluid flow though tube and shell side respectively as working fluid. The results obtained from twisted tape arecompared with plain tube results. The experimental data analysis revels that, when we use twisted tape inserts, showsgreat promise for enhancing heat transfer rate and heat transfer rate is maximum for lower twist ratio(y). The resultshowed that for twisted tape insert with twist ratio y = 6.12 shows increase in Nusselt number values by 38%,andfriction factor by 98.48% as compared to plain tube value with water as working fluid. From performance ratio we cansay that twisted tape performs effectively at low Reynolds number range. Finally new generalized correlations functionfor predicting heat transfer and friction factor for laminar flow of water are proposed with tape inserts

Kiran Maruti Patil, K. I. Patil, Dr. S.Mayadevi, Dr. S.V.Anekar, “REVIEW OF HEAT TRANSFER AUGMENTATION BY USING TWISTED TAPE INSERT IN LAMINAR REGION”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 4, Issue 3, pp. 706-713, March 2017.