Augmentation of Heat Transfer in Laminar Flow Using Full Length Aluminum Twisted Tape
Abhijit A. Patil¹, Uday C.Kapale², P.B.Gangawati^3
1Asst. Prof. Abhijit A. Patil, Department of Mechanical Engineering, Shivaji University, Sanjay Ghodawat group of Institutions, Atigre, Kolhapur, Maharashtra.
²Dr. Uday C. Kapale, Department of Mechanical Engineering, S. G. Balekundri Institute of Technology, Belgaum, Karnataka.
³Dr. P.B. Gangawati, Department of Mechanical Engineering ,VTU, Basveshwar Engineering college,Bagalkot,Karnataka.
Manuscript received on October 11, 2013. | Revised Manuscript received on October 15, 2013. | Manuscript published on October 25, 2013. | PP:73-77 | Volume-1, Issue-12, October 2013. | Retrieval Number: L05361011213/2013©BEIESP
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Abstract: Low fluid velocity results in small overall heat transfer coefficient as the rate of heat transfer mainly depends upon the movement of molecules of fluids. Towards the goal of improved thermal management heat transfer augmentation is a subject of vital importance in increasing the heat transfer rate and achieving higher efficiency. The need to increase the thermal performance of heat based equipment like ovens, furnaces, and heat exchangers, thereby effecting energy, material, and cost savings as well as a consequential mitigation of environmental degradation had led to the development and use of many heat transfer enhancement techniques. Sixteen different enhancement techniques have been identified by A.E. Bergles [1], which can be classified broadly as passive and active techniques. Primarily, heat transfer augmentation methods are classified in three broad categories as Active method, Passive method and Compound method. The effectiveness of any of these methods is strongly dependent on the mode of heat transfer (single-phase free or forced convection, pool boiling, forced convection boiling or condensation, and convective mass transfer), and type and process application of the heat exchanger. Several options are available for enhancing heat transfer associated with internal flows. Enhancement may be achieved by increasing the convection coefficient and/or by increasing the convection surface area. The wire inserts or says tape provides a helical roughness element in contact with the tube inner surface. Alternatively the convection coefficient may be increased by inducing the swirl through insertion of a twisted tape. The inserts consist of a thin strip that is periodically twisted through 360 degrees. Tape inserts are inexpensive and can be easily employed to improve the thermal performance of existing system. Introduction of a tangential velocity component increases the speed of the flow, particularly near the tube wall. By coiling the tube the heat transfer may be enhanced without turbulence or additional heat transfer surface area. In this experimental project a continuous twisted insert of Aluminium material is used to study the effect of insert on different parameters like Overall heat transfer coefficient, Reynolds Number, Effectiveness, and the Temperature Variation etc. This paper gives revising the use of such techniques by using twisted aluminum tape to understand the enhancement in rate of heat transfer for pipe flow. Numbers of cases are studied by using heat exchanger with and without inserts, changing the condition of flow as parallel and counter flow and also by changing the path of hot fluid
Keywords: Effectiveness, and the Temperature Variation etc. This paper gives revising the use of such techniques by using twisted aluminum tape to understand the enhancement in rate of heat transfer for pipe flow. Numbers of cases are studied.