Investigation of nanofluid heat transfer in a microchannel under magnetic field via lattice Boltzmann method: effects of surface hydrophobicity, viscous dissipation, and Joule heating

Ali Alipour Lalami, Hamid Hassanzadeh Afrouzi, Abouzar Moshfegh, Mohammad Omidi, Ashkan Javadzadegan

Research output: Contribution to journalArticleResearchpeer-review

Abstract

In this paper, effect of Joule heating (JH), viscous dissipations (VD), and super hydrophobic surfaces on heat transfer of water-Al2O3 and water-CuO nanofluids in a microchannel has been investigated using lattice Boltzmann method (LBM). The microchannel is under a uniform and transverse magnetic field. The lower wall of the microchannel is insulated and a uniform heat flux has been applied to the upper wall. Results are generated at constant Reynolds number of 150, volume fraction of 2%, and a diameter of 25 nm with variable Hartmann numbers ranging from 0 to 20 and nondimensional slip coefficients from 0 to 0.05. The results of the developed code are in good agreement with other analytical, numerical, and experimental reports. Moreover, the results show that in such case, ignoring the JH and VD leads to a significant error in the prediction of Nusselt number up to 62% and 56%, respectively, for water-Al2O3 and water-CuO nanofluids. It has also been shown that using a super hydrophobic surface with a slip coefficient of 0.05 leads to a significant reduction in VD; however, it increases the effect of JH. On the other hand, it is found that, despite JH and viscous dissipation effects, using super hydrophobic surfaces (up to a slip coefficient of 0.05) leads to an increase in Nusselt number and decrease in shear stress for all the studied Hartmann numbers. Finally, it has been concluded that super hydrophobic surfaces can be used as a passive tool to enhance the heat transfer rate and simultaneously decrease the pumping power demand.

LanguageEnglish
Article number062403
Pages1-10
Number of pages10
JournalJournal of Heat Transfer
Volume141
Issue number6
DOIs
Publication statusPublished - 1 Jun 2019

Fingerprint

Joule heating
Hydrophobicity
hydrophobicity
microchannels
Microchannels
dissipation
heat transfer
Magnetic fields
Heat transfer
Hartmann number
slip
Water
Nusselt number
magnetic fields
water
coefficients
shear stress
Heat flux
Shear stress
heat flux

Keywords

  • Joule heating
  • lattice Boltzmann method
  • magnetic field
  • microchannel
  • nanofluid
  • viscous dissipations

Cite this

Alipour Lalami, Ali ; Hassanzadeh Afrouzi, Hamid ; Moshfegh, Abouzar ; Omidi, Mohammad ; Javadzadegan, Ashkan. / Investigation of nanofluid heat transfer in a microchannel under magnetic field via lattice Boltzmann method : effects of surface hydrophobicity, viscous dissipation, and Joule heating. In: Journal of Heat Transfer. 2019 ; Vol. 141, No. 6. pp. 1-10.
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title = "Investigation of nanofluid heat transfer in a microchannel under magnetic field via lattice Boltzmann method: effects of surface hydrophobicity, viscous dissipation, and Joule heating",
abstract = "In this paper, effect of Joule heating (JH), viscous dissipations (VD), and super hydrophobic surfaces on heat transfer of water-Al2O3 and water-CuO nanofluids in a microchannel has been investigated using lattice Boltzmann method (LBM). The microchannel is under a uniform and transverse magnetic field. The lower wall of the microchannel is insulated and a uniform heat flux has been applied to the upper wall. Results are generated at constant Reynolds number of 150, volume fraction of 2{\%}, and a diameter of 25 nm with variable Hartmann numbers ranging from 0 to 20 and nondimensional slip coefficients from 0 to 0.05. The results of the developed code are in good agreement with other analytical, numerical, and experimental reports. Moreover, the results show that in such case, ignoring the JH and VD leads to a significant error in the prediction of Nusselt number up to 62{\%} and 56{\%}, respectively, for water-Al2O3 and water-CuO nanofluids. It has also been shown that using a super hydrophobic surface with a slip coefficient of 0.05 leads to a significant reduction in VD; however, it increases the effect of JH. On the other hand, it is found that, despite JH and viscous dissipation effects, using super hydrophobic surfaces (up to a slip coefficient of 0.05) leads to an increase in Nusselt number and decrease in shear stress for all the studied Hartmann numbers. Finally, it has been concluded that super hydrophobic surfaces can be used as a passive tool to enhance the heat transfer rate and simultaneously decrease the pumping power demand.",
keywords = "Joule heating, lattice Boltzmann method, magnetic field, microchannel, nanofluid, viscous dissipations",
author = "{Alipour Lalami}, Ali and {Hassanzadeh Afrouzi}, Hamid and Abouzar Moshfegh and Mohammad Omidi and Ashkan Javadzadegan",
year = "2019",
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Investigation of nanofluid heat transfer in a microchannel under magnetic field via lattice Boltzmann method : effects of surface hydrophobicity, viscous dissipation, and Joule heating. / Alipour Lalami, Ali; Hassanzadeh Afrouzi, Hamid; Moshfegh, Abouzar; Omidi, Mohammad; Javadzadegan, Ashkan.

In: Journal of Heat Transfer, Vol. 141, No. 6, 062403, 01.06.2019, p. 1-10.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Investigation of nanofluid heat transfer in a microchannel under magnetic field via lattice Boltzmann method

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AU - Alipour Lalami, Ali

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AU - Omidi, Mohammad

AU - Javadzadegan, Ashkan

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AB - In this paper, effect of Joule heating (JH), viscous dissipations (VD), and super hydrophobic surfaces on heat transfer of water-Al2O3 and water-CuO nanofluids in a microchannel has been investigated using lattice Boltzmann method (LBM). The microchannel is under a uniform and transverse magnetic field. The lower wall of the microchannel is insulated and a uniform heat flux has been applied to the upper wall. Results are generated at constant Reynolds number of 150, volume fraction of 2%, and a diameter of 25 nm with variable Hartmann numbers ranging from 0 to 20 and nondimensional slip coefficients from 0 to 0.05. The results of the developed code are in good agreement with other analytical, numerical, and experimental reports. Moreover, the results show that in such case, ignoring the JH and VD leads to a significant error in the prediction of Nusselt number up to 62% and 56%, respectively, for water-Al2O3 and water-CuO nanofluids. It has also been shown that using a super hydrophobic surface with a slip coefficient of 0.05 leads to a significant reduction in VD; however, it increases the effect of JH. On the other hand, it is found that, despite JH and viscous dissipation effects, using super hydrophobic surfaces (up to a slip coefficient of 0.05) leads to an increase in Nusselt number and decrease in shear stress for all the studied Hartmann numbers. Finally, it has been concluded that super hydrophobic surfaces can be used as a passive tool to enhance the heat transfer rate and simultaneously decrease the pumping power demand.

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KW - magnetic field

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