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 - Tập 30 Số 5 - Trang 2683-2704 - 2020
Seyed Amin Bagherzadeh1, Esmaeil Jalali1, Mohammad Mohsen Sarafraz2, Omid Ali Akbari3, Arash Karimipour1, Marjan Goodarzi4, Quang‐Vu Bach4
1Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2School of Mechanical Engineering, The University of Adelaide, South Australia
3Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran
4Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam

Tóm tắt

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.

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International Journal of Numerical Methods for Heat and Fluid Flow

Tập 30 Số 5

2683-2704

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