Publicado 6 números por año
ISSN Imprimir: 2152-5102
ISSN En Línea: 2152-5110
Indexed in
Numerical Investigations of Oscillatory Motions of a Rotating Viscoelastic Nanofluid Layer in Natural Convection
SINOPSIS
The present work aims at studying the oscillatory motions of a rotating viscoelastic nanofluid layer contained between two free boundaries in natural convection. The Oldroyd-B model is utilized to describe the rheological behaviour of a viscoelastic fluid. The model used for nanofluid combines the effect of Brownian motion along with thermophoresis. Using linear stability analysis, the main focus is on the stationary and oscillatory convection for idealized boundary conditions. The explicit expressions of convective thresholds in terms of the control parameters of the system are obtained. The effects of the Deborah number, retardation parameter, concentration Rayleigh number, Prandtl number, Taylor number and Lewis number on the stability of the system have been investigated. Results indicate that there was competition among the processes of thermophoresis, Brownian diffusion, angular velocity and viscoelasticity which cause oscillatory rather than stationary convection to occur. Oscillatory instability is possible with both bottom- and top-heavy nanoparticle distributions. Regimes of stationary and oscillatory convection for various parameters have been derived numerically and discussed in detail.
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Kaur Jeevanpreet, Gupta Urvashi, Sharma Ram Prakash, Unsteady Finite Amplitude Magneto-Convection of Oldroyd-B Nanofluids with Internal Heat Source, Journal of Nanofluids, 12, 1, 2023. Crossref