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Heat Transfer Research
Импакт фактор: 0.404 5-летний Импакт фактор: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561

Выпуски:
Том 50, 2019 Том 49, 2018 Том 48, 2017 Том 47, 2016 Том 46, 2015 Том 45, 2014 Том 44, 2013 Том 43, 2012 Том 42, 2011 Том 41, 2010 Том 40, 2009 Том 39, 2008 Том 38, 2007 Том 37, 2006 Том 36, 2005 Том 35, 2004 Том 34, 2003 Том 33, 2002 Том 32, 2001 Том 31, 2000 Том 30, 1999 Том 29, 1998 Том 28, 1997

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

Краткое описание

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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