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Magneto Binary Nanofluid Convection in Porous Medium


Affiliations
1 Energy Research Centre, Panjab University, Chandigarh 160014, India
2 Dr. S. S. Bhatnagar University Institute of Chemical Engineering and Technology, Panjab University, Chandigarh 160014, India
 

The effect of an externally impressed magnetic field on the stability of a binary nanofluid layer in porous medium is considered in this work.The conservation equations related to the system are solved using normal mode technique and Galerkin method to analyze the problem. The complex expressions are approximated to get useful results. Mode of heat transfer is stationary for top heavy distribution of nanoparticles in the fluid layer and top heavy nanofluids are very less stable than regular fluids. Oscillatory motions are possible for bottom heavy distribution of nanoparticles and they are not much influenced by properties of different nanoparticles. A comparative analysis of the instability of water based nanofluids with metallic (Cu, Ag) and semiconducting (TiO2, SiO2) nanoparticles under the influence ofmagnetic field is examined. Semiconducting nanofluids are found to be more stable than metallic nanofluids. Porosity destabilizes the layer while solute difference (at the boundaries of the layer) stabilizes it.Magnetic field stabilizes the fluid layer system significantly.
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  • Magneto Binary Nanofluid Convection in Porous Medium

Abstract Views: 68  |  PDF Views: 1

Authors

Jyoti Sharma
Energy Research Centre, Panjab University, Chandigarh 160014, India
Urvashi Gupta
Dr. S. S. Bhatnagar University Institute of Chemical Engineering and Technology, Panjab University, Chandigarh 160014, India
R. K. Wanchoo
Dr. S. S. Bhatnagar University Institute of Chemical Engineering and Technology, Panjab University, Chandigarh 160014, India

Abstract


The effect of an externally impressed magnetic field on the stability of a binary nanofluid layer in porous medium is considered in this work.The conservation equations related to the system are solved using normal mode technique and Galerkin method to analyze the problem. The complex expressions are approximated to get useful results. Mode of heat transfer is stationary for top heavy distribution of nanoparticles in the fluid layer and top heavy nanofluids are very less stable than regular fluids. Oscillatory motions are possible for bottom heavy distribution of nanoparticles and they are not much influenced by properties of different nanoparticles. A comparative analysis of the instability of water based nanofluids with metallic (Cu, Ag) and semiconducting (TiO2, SiO2) nanoparticles under the influence ofmagnetic field is examined. Semiconducting nanofluids are found to be more stable than metallic nanofluids. Porosity destabilizes the layer while solute difference (at the boundaries of the layer) stabilizes it.Magnetic field stabilizes the fluid layer system significantly.