performance enhancement of a two-fluid corrugated torsional heat exchanger containing hybrid nanofluids

Subject Areas : Heat Transfer

mojtaba  jamiati ¹ (Assistant professor Department of Mechanical Engineering, Naragh Branch, Islamic Azad University, Naragh, Iran)
Hossein  Pourmohamadian ² (گروه مهندسی مکانیک، واحد نراق، دانشگاه آزاد اسلامی، نراق، ایران)

Received: 2020-09-23 Accepted : 2021-02-13 Published : 2021-02-13

Keywords: Fluent software, Hybrid nanofluid, Torsional Heat Exchanger, Spherical corrugate, Thermal Hydraulic Performance Evaluation Criteria (PEC),

Abstract :

In this research, the effect of the corrugate inside a two-fluid torsional heat exchanger containing a hybrid water-copper-carbon nanotube nanofluid is investigated numerically using computational fluid dynamics. The geometry of the torsion heat exchanger is prepared using Design Modler software. Also, in order to analyze the fluids, the finite volume method and Ensys Fluent software are used. The hybrid nanofluid stream is in the turbulent and the K Omega turbulence model is used to model it. The geometry of the simple torsional heat exchanger is compared with the torsional heat exchanger with the corrugate and the output results are presented in the form of graphs of mean Nusselt number, pressure drop and PEC index. The study is performed for Reynolds numbers 6000 to 24000, volume fraction of 1 to 5% and three different heights of 1, 2 and 3 mm from the congress. The results obtained from numerical simulation show that the use of water-copper-carbon nanotube hybrid nanofluid causes higher thermal performance than water-based fluid.