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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018025424
pages 17-32

EXPERIMENTAL INVESTIGATION OF THE EFFECT OF FLOW BLOCKAGES ON HEAT TRANSFER AND FLUID FRICTION IN A ROUND TUBE USING WALL-ATTACHED CIRCULAR RINGS

Adhikrao S. Patil
Research Scholar, Department of Mechanical Engineering, Sinhgad College of Engineering, Savitribai Phule Pune University, Pune 411041, India
Sandeep S. Kore
Department of Mechanical Engineering, Vishwakarma Institute of Information Technology, Pune 411048, India
Narayan K. Sane
Department of Mechanical Engineering Walchand College of Engineering Vishrambag, SANGLI - 416 415 (Maharashtra), INDIA

RÉSUMÉ

This paper studies the flow blockage effect on thermal performance in a round tube. The experiments were carried on a heat exchanging tube which is fitted with wall-attached circular rings (with no gap between the ring and inner wall of the tube) as a flow blockage device. The aim of this investigation is to introduce a flow blockage area (FBA) as a new parameter to evaluate the performance of different turbulators (turbulator is a passive device which induces secondary/reverse flow within the flow field). The wall-attached circular rings were selected as flow blockage geometry and configured with different inner diameters to achieve flow blockage area of 30%, 40%, and 50%. The parameters varied during the tests were FBA, the pitch-to-diameter ratio (PDR), and the Reynolds number. Air with ambient temperature was used as a working fluid in a test tube in which the inner wall is maintained at a uniform heat flux. The Reynolds number and pitch-to-diameter ratio were varied from 6000 to 24,000 and from 2 to 4, respectively. Significant enhancement in heat transfer rate up to 3.04 times that of the smooth tube was observed with inserts of 50% FBA and a smaller pitch-to-diameter ratio, i.e., 2 at a higher Reynolds number. An insert, i.e., a circular ring which offers flow blockage area of 30% and pitch-to-diameter ratio 2, gives the highest overall performance factor (1.26) at a lower Reynolds number.


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