LAMINAR FLOW HEAT TRANSFER AUGMENTATION BY USING INSERTS
| Author(s) | : | Kalyan I. Patil, Dr. S.Mayadevi, Dr. S.V.Anekar, G.S.Kamble, Dr.Gawali B.S |
| Institution | : | Chemical Engg. Dept., T. K. I. E. T Warananagar |
| Published In | : | Vol. 5, Issue 2 — February 2018 |
| Page No. | : | 539-545 |
| Domain | : | Engineering |
| Type | : | Research Paper |
| ISSN (Online) | : | 2348-4470 |
| ISSN (Print) | : | 2348-6406 |
Heat transfer augmentation techniques are used to increase rate of heat transfer without affecting much onoverall performance of system. This paper 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 NonNewtonian solution (0.2 wt . percent CMC solution) as working fluid. The experiments are conducted in Reynoldsnumber range 87 to 347 with twisted tape inserts of different twist ratio(y=H/D) in the range 6.11 to 7.77. The inner tubeis made of copper with inner and outer diameter 19.5x10-3m and 24.5x10-3m respectively. Twisted tape is made up ofstainless steel of 1 mm thickness and 1.9 m length. Hot and cold fluid flow though tube and shell side respectively Hotfluid is Non Newtonian fluid & is used as a test fluid . The results obtained from twisted tape are compared with plaintube results. The result obtained for Non Newtonian solution conforms that twisted tapes are more effective with NonNewtonian solution than for water. For non-Newtonian solution heat transfer coefficient increases with decrease in twistratio. Maximum value of Nusselt number is obtained for twist ratio y = 6.11 which is 40% higher than plain tube andfriction factor increases by 56.86% than plain tube value. If we compare the experimental results for water and nonNewtonian solution, it is clear that, twisted tape inserts are more effective with Non-Newtonian solution than water asworking fluid. From performance ratio we can say that twisted tape performs effectively at low Reynolds number range.Finally new generalized correlations function for predicting heat transfer and friction factor for laminar flow of NonNewtonian solution are proposed with tape inserts.
Kalyan I. Patil, Dr. S.Mayadevi, Dr. S.V.Anekar, G.S.Kamble, Dr.Gawali B.S, “LAMINAR FLOW HEAT TRANSFER AUGMENTATION BY USING INSERTS”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 5, Issue 2, pp. 539-545, February 2018.
