THERMAL SCIENCE

International Scientific Journal

Swaminathan Selvam

,

P. R. Thiyagarajan

,

Sivan Suresh

EXPERIMENTAL STUDIES ON EFFECT OF WIRE COILED COIL MATRIX TURBULATORS WITH AND WITHOUT BONDING ON THE WALL OF THE TEST SECTION OF CONCENTRIC TUBE HEAT EXCHANGER

ABSTRACT
This paper presents the effect of bonding and without bonding of wire coiled coil matrix turbulator on the heat transfer for a fully developed turbulent flow. Experiments are conducted by maintaining constant wall temperature. Tests are performed on 3 different wire coiled coil matrix turbulators of different pitches of 5, 10 and 15 mm without bonding of the turbulator. Three similar types of heat exchangers are fabricated and the wire coiled coil matrix turbulators with different pitches of 5, 10 and 15mm are inserted in the heat exchangers and bonding is done on the surface of the tube section. Results have indicated that the heat transfer rate enhances inversely with the pitch of the wire coiled coil matrix turbulator with bonding. With a pitch of 5 mm, the turbulators without bonding have resulted in almost 25.4% enhancement when compared with plain tube. On the other hand, for pitches of 10 mm and 15 mm the enhancement were 20.7% and 16.8%, respectively. The empirical correlations developed for turbulators with and without bonding results in ±6% deviation for Nusselt number and ±3% for friction factor. Similarly with a pitch of 5 mm, the turbulators with bonding have resulted in almost 42% enhancement. For pitches of 10mm and 15mm the enhancements were 34.7% and 25%, respectively.
KEYWORDS
turbulent flow, wire coiled coil matrix turbulator, pitch, heat transfer, bonding
PAPER SUBMITTED: 2011-03-18
PAPER REVISED: 2011-08-07
PAPER ACCEPTED: 2011-08-23
DOI REFERENCE: https://doi.org/10.2298/TSCI110318117S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2012, VOLUME 16, ISSUE Issue 4, PAGES [1151 - 1164]
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Experimental studies on effect of wire coiled coil matrix turbulators with and without bonding on the wall of the test section of concentric tube heat exchanger

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence