Effects of magnetic field on micro cross jet injection of dispersed nanoparticles in a microchannel

Bagherzadeh, S.A., Jalali, E., Sarafraz, M.M., Ali Akbari, O., Karimipour, A., Goodarzi, M. and Bach, Q.V. 2019, Effects of magnetic field on micro cross jet injection of dispersed nanoparticles in a microchannel, International Journal of Numerical Methods for Heat and Fluid Flow, vol. 30, no. 5, pp. 2683-2704, doi: 10.1108/HFF-02-2019-0150.

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Title Effects of magnetic field on micro cross jet injection of dispersed nanoparticles in a microchannel
Author(s) Bagherzadeh, S.A.
Jalali, E.
Sarafraz, M.M.ORCID iD for Sarafraz, M.M. orcid.org/0000-0002-6347-0216
Ali Akbari, O.
Karimipour, A.
Goodarzi, M.
Bach, Q.V.
Journal name International Journal of Numerical Methods for Heat and Fluid Flow
Volume number 30
Issue number 5
Start page 2683
End page 2704
Total pages 22
Publisher Emerald Group Publishing
Place of publication Bingley, Eng.
Publication date 2019-09-07
ISSN 0961-5539
1758-6585
Keyword(s) Science & Technology
Physical Sciences
Technology
Thermodynamics
Mathematics, Interdisciplinary Applications
Mechanics
Mathematics
Magnetic field
Slip velocity
Nanofluid jet injection
Rectangular microchannel
HEAT-TRANSFER ENHANCEMENT
NON-NEWTONIAN NANOFLUID
WATER-AL2O3 NANOFLUID
MIXED CONVECTION
TURBULENT-FLOW
WATER/AL2O3 NANOFLUID
THERMAL-CONDUCTIVITY
NATURAL-CONVECTION
WATER NANOFLUID
LAMINAR-FLOW
Summary Purpose Water/Al2O3 nanofluid with volume fractions of 0, 0.3 and 0.06 was investigated inside a rectangular microchannel. Jet injection of nanofluid was used to enhance the heat transfer under a homogeneous magnetic field with the strengths of Ha = 0, 20 and 40. Both slip velocity and no-slip boundary conditions were used.Design/methodology/approach The laminar flow was studied using Reynolds numbers of 1, 10 and 50. The results showed that in creep motion state, the constricted cross section caused by fluid jet is not observable and the rise of axial velocity level is only because of the presence of additional size of the microchannel. By increasing the strength of the magnetic field and because of the rise of the Lorentz force, the motion of fluid layers on each other becomes limited.Findings Because of the limitation of sudden changes of fluid in jet injection areas, the magnetic force compresses the fluid to the bottom wall, and this behavior limits the vertical velocity gradients. In the absence of a magnetic field and under the influence of the velocity boundary layer, the fluid motion has more variations. In creeping velocities of fluid, the presence or absence of the magnetic field does not have an essential effect on Nusselt number enhancement.Originality/value In lower velocities of fluid, the effect of the jet is not significant, and the thermal boundary layer affects the entire temperature field. In this case, for Hartmann numbers of 40 and 0, changing the Nusselt number on the heated wall is similar.
Language eng
DOI 10.1108/HFF-02-2019-0150
Indigenous content off
Field of Research 01 Mathematical Sciences
09 Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30142887

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