MHD mixed convection and entropy generation of water–alumina nanofluid flow in a double lid driven cavity with discrete heating

摘要: Abstract In the present study, entropy generation due to mixed convection in a partially heated square double lid driven cavity filled with Al 2 O 3 –water nanofluid under influence of inclined magnetic field is numerically investigated. At lower wall two heat sources are fixed, condition that remaining part bottom kept insulated. Top and vertically moving walls maintained at constant cold temperature. Buoyant force responsible for flow along vertical walls. Governing equations discretized space using LBB-stable finite element pair Q / P 1 disc which lead 3rd 2nd order accuracy L2-norm velocity/temperature pressure, respectively fully implicit Crank–Nicolson scheme utilized temporal discretization. The systems nonlinear treated by Newton method associated linear subproblems solved means Guassian elimination method. Numerical results presented analyzed streamlines, isotherms, tables some useful plots. Impacts emerging parameters on flow, specific ranges such as Reynolds number ( ≤ Re 100 ) , Richardson Ri 50 Hartman 0 Ha solid volume fraction ϕ 0.2 well angles ° γ 90 investigated findings exactly same previously performed analysis. Calculation average Nusselt number, transfer, fluid friction field, total generation, Bejan kinetic energy main focus our study.