Two-way fluid-structure interaction study of twisted tape insert in a circular tube having integral fins with nanofluid

Mustafa Abdulsalam Mustafa,Atheer Raheem Abdullah,Laith J Habeeb,Wajeeh Kamal Hasan,Maadh Fawzi Nassar

doi:10.15587/1729-4061.2021.234125

Mustafa Abdulsalam Mustafa, Atheer Raheem Abdullah + Show 3 more

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https://doi.org/10.15587/1729-4061.2021.234125

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Abstract

This work deals with fluid-structure interaction (FSI), one of the emerging areas of numerical simulation and calculation. This research shows a numerical study investigating heat transfer enhancement and fluid-structure interaction in a circular finned tube by using alumina nanofluid as a working fluid with a typical twisted tape that has a twisting ratio of 1.85. The studied nanofluid volumes of fraction are φ=0, 3, 5 % under conditions of laminar and turbulent flow. The solution for such problems is based on the relations of continuum mechanics and is mostly done with numerical methods. FSI occurs when the flow of fluid influences the properties of a structure or vice versa. It is a computational challenge to deal with such problems due to complexity in defining the geometries, nature of the interaction between a fluid and solid, intricate physics of fluids and requirements of computational resources. CFD investigations were made based on the numerical finite volume techniques to solve the governing three-dimensional partial differential equations to get the influence of inserted twisted tape and concentration of nanofluid on heat transfer enhancement, friction loss, average Nusselt number, velocity profile, thermal performance factor characteristics, and two-way interaction in a circular tube at laminar and turbulent flow. The governing continuity, momentum and energy transfer equations are solved using Ansys Fluent and Transient Structural. The simulation results show that the deformations of two-way coupling fluctuate from side to side, with 0.004 mm, as maximum amplitude, located at the typical twisted tape center. Heat transfer dissipation improved by adding fins and as Reynolds numbers increase the heat transfer behavior increases.

Highlights

Fluid-structure interaction (FSI) is a multi-physics phenomenon, which occurs in a system where a flow of fluid causes a solid structure to deform, which, in turn, changes the boundary condition of a fluid system
The results found that the performance of half-length twisted tape inserts in the U-bend heat exchanger was better than in the plain heat exchanger
The key objective of this study is to analyze the flow by developing numerical investigation tools, fluid-structure interaction and heat transfer characteristics of nanofluid (Al2O3/water) in a horizontal circular finned tube fitted with typical twisted tape under laminar and turbulent flow at constant inlet temperature

Summary

Introduction

Fluid-structure interaction (FSI) is a multi-physics phenomenon, which occurs in a system where a flow of fluid causes a solid structure to deform, which, in turn, changes the boundary condition of a fluid system. This kind of interaction occurs in many natural phenomena and man-made engineering systems. Nowadays, engineering researchers are looking for new enhancement methods for transferring heat between surfaces and ambient fluid By this fact, the researcher [2,3,4] classified the mechanisms of improving convective heat transfer for active or passive techniques

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