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Silver–water nanofluid flow and convective heat transfer in a microfin tube equipped with loose-fit twisted tapes
Authors:Samruaisin  P  Wongcharee  K  Chuwattanakul  V  Eiamsa-ard  S
Institution:1.Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok, 10530, Thailand
;2.Department of Chemical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok, 10530, Thailand
;3.Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand
;
Abstract:

Heat transfer enhancement and performance of compact heat exchangers have been extensively studied in the past century for the purpose of promoting energy efficiency. Microfin tubes in single/two/multiple-phase flow heat exchangers into which twisted tape swirl generators are installed can promote heat transfer with a moderate pressure loss penalty. This article reports on the enhanced heat transfer of silver–water nanofluids in a microfin tube into which loose-fit twisted tapes are installed in a counter-flow arrangement. The experiments were carried out using nanofluids with various silver concentrations (0.007–0.03 vol%), loose-fit twisted tapes with clearance ratios (c/D) of 0.0 (tight-fit), 0.05, 0.075 and 0.1, for a twist ratio, y/W, of 2.0. The results indicate that the heat transfer rate (Nu) and pressure drop (f) increase with a decrease in clearance ratio (c/D) and increase in silver (Ag) nanoparticle concentration. Additionally, the thermal performance factor tends to increase with the decrease in Reynolds numbers.

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