Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

Numerical Investigation of Double Pipe Heat Exchanger with Nanofluid Inside Helically Corrugated Tube in the Presence of Magnetic Field

Authors
Amin Alami nia 1
Mohammad Hossein Ghanbari Arzili 2
1 Assistant Professor, Mechanical Engineering Department, Faculty of Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran
2 M.Sc., Mechanical Engineering Department, Faculty of Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran
10.30506/ijmep.2023.552909.1873
Abstract
In the present work, a special type of concentric two-pipe heat exchangers has been analyzed, in which the inner tube of the heat exchanger is considered as helical grooved. The turbulent flow of water-aluminum oxide nanofluid is used on both sides of the heat exchanger and a constant intensity magnetic field is used to enhance the effect of using the nanofluid. The effect of using this system as well as the use of nanofluid and magnetic field on the total heat transfer coefficient and the total pressure drop of the heat exchanger have been investigated. The results of studies in this field show that the use of nanofluids increases the heat transfer that occurs in the heat exchanger and also decreases the total pressure. While the most suitable volume percentage of nanofluid for the best ratio of heat transfer to pressure drop is also reported to be 15%. The numerical results of this article have also shown that the best optimal conditions in terms of heat transfer enhancement and pressure drop (according to the PEC performance evaluation criteria) are at 15% volume of nanofluid. Applying a magnetic field to the nanofluid current in the transducer also helps to increase the heat transfer in the heat exchanger while also increasing the total pressure drop. The amount of flow velocity has an obvious effect on the displacement heat transfer coefficient of the heat exchanger as well as the amount of total pressure drop. The simulation of the heat exchanger in different values ​​of the turbulent flow Reynolds number shows that the increase in the Reynolds number has a direct effect on the displacement heat transfer and the total pressure drop. The results show that in the intensity of the magnetic field with Hartmann number 40, the best ratio of heat transfer to the pressure drop of the heat exchanger occurs. The best PEC number in Hartmann number 40 is 1.05. However, with further increase of Hartmann number to 60 and 80, the value of PEC number decreases and in Hartmann number 80 decreases to 0.99, which practically makes the use of nanofluid in the presence of magnetic field affectless. The rate of flow velocity has a significant effect on the heat transfer coefficient of the heat exchanger and also the rate of total pressure drop. The value of the PEC number increases from 1.01 to 1.09 in increasing the Reynolds number from 6000 to 10000. However, it seems that with a relatively small increase in the PEC number and increasing costs in increasing the Reynolds number, using a lower Reynolds number scaler is a better choice.
Keywords
Two-pipe heat exchanger
Nanofluid
Helical grooved pipe
Magnetic field
PEC

Subjects

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  • Receive Date 29 April 2022
  • Revise Date 05 August 2022
  • Accept Date 30 January 2023