THERMAL SCIENCE

International Scientific Journal

EXPERIMENTAL STUDIES ON EFFECT OF BONDING THE TWISTED TAPE WITH PINS TO THE INNER SURFACE OF THE CIRCULAR TUBE

ABSTRACT
Heat transfer and friction factor characteristics are studied for water flowing through the tube in tube heat exchanger for two different configurations, namely,(1) twisted tape with pins (TTP) and (2) twisted tape with pins bonded to the inner surface of the test section (TTPB). Experiments are carried out for different twist pitch to the width of the twisted tape ratios (y/w) for TTP and TTPB. But very few research works have been done based on the above mentioned heat transfer enhancement techniques. This paper presents the effect of twisted tape with pins on the heat transfer for a fully developed turbulent flow. Experiments are conducted by maintaining constant wall temperature. The heat transfer rate and pressure drop is found to be high for TTPB of y/w=3.33 when compared to all other configurations. The empirical correlations developed for different twisted tape with pins results in ±7.28% deviation for Nusselt number and ±7.16% for friction factor.
KEYWORDS
PAPER SUBMITTED: 2012-08-07
PAPER REVISED: 2013-02-27
PAPER ACCEPTED: 2013-03-30
PUBLISHED ONLINE: 2013-04-21
DOI REFERENCE: https://doi.org/10.2298/TSCI120807036S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2014, VOLUME 18, ISSUE 4, PAGES [1273 - 1283]
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