Magnetic Field Effect on Ferro-Nanofluid Heat Transfer in a Shell and Tube Heat Exchanger with Seven Twisted Oval Tubes

Subject Areas : Mechanical Engineering

Mansour  Talebi ¹ (Reactor and Nuclear Safety Research School, Nuclear Science & Technology Research Institute, Iran)
Mehran  Tabibian ² (Department of Mechanical Engineering, Majlesi Branch, Islamic Azad University, Iran)

Received: 2021-08-04 Accepted : 2021-11-26 Published : 2022-06-01

Keywords: Ferro-Nanofluid, Twisted Oval Tubes, magnetic field, Shell and Tube Heat Exchanger,

Abstract :

This article investigates the effect of magnetic field on the performance of a special shell-and-tube heat exchanger using ferro-nanofluid. The heat exchanger comprises seven twisted oval tubes with triangular array mounted on a hexagonal cross section. Water/iron oxide nanofluid with a volume ratio of 4% is used as hot fluid in tubes and water is employed as cooling fluid in the shell. The flow regime is laminar and calculations are performed at different Reynolds numbers and various magnetic fields. The governing equations include continuum, momentum, energy, and magnetic field equations that are solved using a finite volume method. It is demonstrated that the wall temperature of the tubes at the output is lower when the magnetic field is present compared to the case in which the magnetic field is not applied. Applying the magnetic field to the ferro-nanofluid leads to an increase in the Nusselt Number by about two times, leading to an increase in thermal efficiency of the heat exchanger. Also, the effect of the magnetic field was quite different with respect to the geometry and position of the tubes relative to the flow field. The effect of increasing the Nu in the first half of the twisting of the tube is approximately equal to the rate of reduction in the second half of the tube, resulting in a reduction in the impact of the magnetic field intensity.

References:

• Xiang hui, T.‚ Dong sheng, Zhu.‚ Guo yan, Z‚ and Li ding, Z.‚ Heat Transfer and Pressure Drop Performance of Twisted Oval Tube Heat Exchanger‚ Applied Thermal Engineering‚ Vol. 50, No. 1, 2013, pp. 374-381.


• Xinyi, T.‚ Xianfeng, D.‚ and Dongsheng, Z‚ Experimental and Numerical Investigation of Convective Heat Transfer and Fluid Flow in Twisted Spiral Tube‚ International Journal of Heat and Mass Transfer‚ Vol. 90, 2015, pp. 532-541.


• Duangthongsuk, , Wongwises, S., Heat Transfer Enhancement and Pressure Drop Characteristics of TiO2–Water Nanofluid in A Double-Tube Counter Flow Heat Exchanger, International Journal of Heat and Mass Transfer, Vol. 52, No. 7, pp. 2059-2067, (2009).


• Aminfar, H., Mohammadpourfard, M., and Narmani Kahnamouei, , A 3D Numerical Simulation of Mixed Convection of a Magnetic Nanofluid in The Presence of Non-Uniform Magnetic Field in A Vertical Tube Using Two Phase Mixture Model, Journal of Magnetism and Magnetic Materials, Vol. 323, No. 15, 2011, pp. 1963-1972.


• Shakiba‚ Gorji‚ , Numerical Investigation of Ferrofluid Flow and Heat Transfer Characteristics Through a double Tube Heat Exchanger‚ Journal of Magnetism and Magnetic Materials‚ Vol. 33‚ No. 4‚ 2009, pp. 591-596.


• Sheikholeslami, , Numerical Investigation for CuO-H2O Nanofluid Flow in A Porouschannel with Magnetic Field Using Mesoscopic Method, Journal of Molecular Liquids, Vol. 249, 2018, pp.739-746.


• Xiang hui, T.‚ Dong sheng, Z‚Guo yan, Zh.‚ and Li ding, Z.‚ Experimental and Numerical Study of Convective Heat Transfer and Fluid Flow in Twisted Oval Tubes‚ International Journal of Heat and Mass Transfer‚ Vol. 55, 2012, pp. 4701-4710.


• Mojtaba Mokhtari, , Hariri, S., Barzegar Gerdroodbary, M., Yeganeh, and R., Effect of Non-Uniform Magnetic Field on Heat Transfer of Swirling Ferrofluid Flow Inside Tube with Twisted Tapes, Chemical Engineering and Processing, Vol. 117, 2017, pp. 70-79.


• Sheikholeslami, , Hayat, T., and Alsaedi, A., Numerical Study for External Magnetic Source Influence on Water Based Nanofluid Convective Heat Transfer, International Journal of Heat and Mass Transfer, Vol. 106, 2016, pp. 745-755.


• Valiallah Mousavi, , Sheikholeslami, M., Gorji bandpy,M., and Barzegar Gerdroodbary, M., The Influence of Magnetic Field on Heat Transfer of Magnetic Nanofluid in A Sinusoidal Double Tube Heat Exchanger, Journal of Chemical Engineering Research and Design, Vol. 113, 2016, pp. 112-124.


• Mohammad Malekan, Ali Khosravi, Xiaowei, Zhao, The Influence of Magnetic Field on Heat Transfer of Magnetic Nano Fluid in A Double Pipe Heat Exchanger Proposed in A Small-Scale CAES System, Applied Thermal Engineering, 146, 2019, pp. 146-159.


• Jalal Alsarraf, Reza Rahmani, Amin Shahsavari, Masoud Afrand, Somchai Wongwises, "Effect of Magnetic Field on Laminar Forced Convective Heat Transfer of MWCNT-Fe3O4/Water Hybrid in A Heated Tube, Journal of Thermal Analysis and Calorimetry, Vol. 137, No. 5, 2019, 1809-1825.


• Alhuyi Nazari, , Ahmadi, M. H., Sadeghzadeh, M., Behshad Shafii, M., and Goodarzi, M., A Review on Application of Nanofluid in Various Types of Heat Pipes, Journal of Central South University, Vol. 26, 2019, pp. 1021-1041.


• Hatamia, , KazemnejadBanaria, A. Malekzadehb, A., Pouranfardc, A. R., The Effect of Magnetic Field on Nanofluids Heat Transfer Through Auniformly Heated Horizontal Tube, Physics Letters A, Vol. 381, 2017, pp. 510-550.