Abstract
Flow and heat transfer of an incompressible ferro-nanofluid squeeze film with couple stresses and an external magnetic field in a porous geometry is theoretically studied. Based on the Neuringer–Rosensweig model for ferro-hydrodynamics and Stokes’ microcontinuum theory accounting for the couple stresses, the governing Navier–Stokes’ equations for the fluid region are determined. The governing equations for the porous region are obtained based on the modified Darcy law. Further, Beavers–Joseph tangential velocity slip condition is considered at the fluid–porous interface and the problem is solved using a regular perturbation method. Two important applications taken into consideration are the bio-lubrication in articular cartilages with small permeabilities and ferro-hydrodynamic lubrication in porous bearings with comparatively large permeabilities. The combined effects of various parameters such as couple stress parameter, magnetization parameter, Darcy number, microstructure-pore size ratio, Beavers–Joseph constant, Prandtl number, Eckert number and heat generation or absorption parameter on the flow behavior, contact time, mean temperature and heat transfer rate are investigated assuming a constant force squeezing state. The results are compared with the results of existing literature and are found to agree well.
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Vimala, P., Manimegalai, K. Flow and heat transfer in porous squeeze film of ferro-nanofluid with couple stresses. Arch Appl Mech 92, 3877–3895 (2022). https://doi.org/10.1007/s00419-022-02268-1
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DOI: https://doi.org/10.1007/s00419-022-02268-1