Abstract
ABSTRACT This paper primarily focuses on the investigation of performance of tube heat exchanger with use of novel center-perforated tapered twisted tape (CPTTT). Due to CPTTT insert provide small wetted area in tube that resulted less friction factor. This less wetted area characteristics of twisted tape insert attract researcher to explore tapered twisted tape insert in combination with tube heat exchanger. The analysis examines the friction factor and thermal performance of a tapered twisted tape insert with a twist ratio (TR) of 2.77, featuring both center circular perforation (diameter 10 mm) and center elliptical perforation (major axis 10 mm, minor axis 5 mm). In addition to this, twin tapered TT configuration is also analyzed; a total of 36 cases are evaluated. A numerical investigation using the ANSYS FLUENT is carried out to analyze the performance of the center-perforated tapered twisted tape with water as working fluid under laminar flow conditions i.e. 500 ≤ Re ≤ 1750. The computational results revealed that the flow resistance is reduced with the proposed twisted tape configuration as compared to the plain twisted tape; however, thermal performance is affected only marginally. In the optimization study, it is advised to use the tapered twisted tape arrangement because it results in a significant reduction of friction factor about 65% as well as the power input for the marginal reduction in thermal performance.
Published Version
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