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Cu-water nanofluid flow and heat transfer in a heat exchanger tube equipped with cross-cut twisted tape
, Article Powder Technology ; Volume 339 , 2018 , Pages 985-994 ; 00325910 (ISSN) ; Esfahani, J. A ; Sharif University of Technology
Elsevier B.V
2018
Abstract
This paper presents a numerical analysis for Cu-water nanofluid flow through a circular duct inserted with cross-cut twisted tape with alternate axis (CCTA). Three dimensional (RNG) k − ϵ turbulence model is applied to simulate this problem. All simulations are performed for plain tube and nine different CCTA geometries in the range of width ratio (b/w) from 0.7 to 0.9, length ratio (s/w) from 2 to 2.5, Reynolds numbers in the range of 5000 to 15,000 and volume fraction of nanoparticles from 0 to 1.5%. The calculated results indicate that the swirl flow created by CCTA is transferred from the tube core to the near wall regions. This results in higher fluid mixing, which enhances heat...