%0 Journal Article
%T Experimental Study of Heat Transfer Augmentation Characteristics of a Tube Affected by Geometric Parameters of Coiled Spring Inserts
%J Journal of Heat and Mass Transfer Research
%I Semnan University Press
%Z 2345-508X
%A Kapse, Arvind Ashok
%A Shewale, Vinod Chimanrao
%D 2024
%\ 06/01/2024
%V 11
%N 1
%P 127-138
%! Experimental Study of Heat Transfer Augmentation Characteristics of a Tube Affected by Geometric Parameters of Coiled Spring Inserts
%K passive insert
%K average performance ratio
%K turbulent flow
%R 10.22075/jhmtr.2024.30106.1426
%X In the present study, the heat transfer and flow friction characteristics of a circular tube with coiled spring inserts are experimentally reported for a fully developed turbulent flow regime. Experimental investigations were performed in a circular concentric tube in a tube heat exchanger in the Reynolds number (Re) range of 8000–32,000 with water as a working fluid. The average Nusselt number ratio (Nua/Nup) and average friction factor ratio (fa/fp) with and without inserts are reported to be in the range of 1.79–2.79 and 2.44–4.17, respectively, for the tested six geometries of the inserts. The Nusselt number ratio (Nua/Nuc) based on equal pumping power criteria is also reported and found to be in the range of 0.94–1.24. The effects of varying pitch to length of insert ratio (p/l) and diameter of insert to the inner diameter of tube ratio (dc/Di) on heat transfer and pressure drop are reported, and empirical correlation is given for Nusselt number in terms of Reynolds number (Re), pitch to length of insert ratio (p/l), insert diameter to inner diameter of tube ratio (dc/Di), and Prandtl number (Pr).
%U https://jhmtr.semnan.ac.ir/article_8699_eb264570c7b098a9e8009bf3abcb7deb.pdf