Magneto-convection of water-based nanofluids inside an enclosure having uniform heat generation and various thermal boundaries

AbstractInvestigation of two-dimensional steady laminar magneto-convection heat transfer of (Ag,TiO2) water based nanofluids with variable properties inside a heat generating square enclosure having different thermal boundaries is done numerically in this paper. The governing equations are solved utilizing the finite volume method with power-law scheme and SIMPLE algorithm is used for handling the pressure-velocity coupling. The algorithm and the computer code have been also compared with numerical results in order to verify and validate the model. By using the developed fortran code, the effects of Hartmann number, heat generation (or absorption), Reyleigh number and solid volume fraction on the flow and thermal fields and heat transfer inside the enclosure are studied. Results are demonstrated in the form of streamlines, isotherms and average Nusselt number

Inquiry of inclined magnetic field effects on Walter –B nanofluid flow with heat generation / absorption

The article deals with Walter-B nanoliquid flow towards a extending surface with inclined magnetic field effects. Thermal relaxation analysis is made by non fourier heat flux model. Radiation, heat generation / absorption impacts are included. The non linear Partial governing systems are rebuild into nonlinear ordinary systems with the assist of proper similarity transformations. The graphical results are portrayed for velocity, concentration and temperature profile. The physical entitles of heat and mass transfer rates are graphically reported. The comparission with previous results notified the excellent agreement

Convection of Cu-water Nanofluid in a Partially Active Porous Cavity with Internal Heat Generation

[[abstract]]In this study, the effect of internal heat generation for Cu-water nanofluid on natural convection heat transfer in a fluid saturated porous cavity with partially active walls has been numerically investigated. The governing non-dimensional Darcy-Brinkman-Forchheimer equations are solved using the finite volume approach together with SIMPLE algorithm. Benchmark results are compared with present study which furnish that the present results are to be reliable. The addition of nanoparticles produces an augmented heat transfer rate for low values of internal heat generation. On the other hand, the base fluid water induces the maximum heat transfer rate than the nanofluid for high values of internal heat generation parameter. This means that in the presence of high internal heat generation, there is no need to add nanoparticles inside the cavity to generate the augmented heat transfer rate

Natural convection in a square cavity with partially active vertical walls: Time-periodic boundary condition

A numerical study of transient natural convection in a square cavity with partly thermally active side walls is introduced. The thermally active regions of the side walls are periodic in time. Top and bottom of the cavity are adiabatic. Nine different positions of the thermally active zones are considered. The governing equations are solved using control volume method with power-law scheme. The results are obtained for various values of amplitude, period, and Grashof numbers ranging from 104–106 and different thermally active situations. It is found that the average heat transfer increases by increasing amplitude for P=1,5, and decreasing for P=3. The average Nusselt number behaves nonlinearly as a function of period

Natural convection in enclosures with partially thermally active side walls containing internal heat sources

Unsteady laminar natural convection in an enclosure with partially thermally active side walls and internal heat generation is studied numerically. Thermally inactive parts of the side walls and horizontal walls are thermally insulated. The governing equations are solved using the control volume method with a power law scheme. Nine different combinations of the hot and cold thermally active zones are considered. The effects of heat generations, aspect ratios, different Prandtl numbers, and locations of the thermally active part of the side walls on the flow pattern (streamlines), heat distribution (isotherms), midheight velocity, and rate of heat transfer from the walls of the enclosure are presented. It is observed that the heat transfer rate increases with increasing the Grashof number due to an increase in buoyancy force and decreases with an increase in heat generation. The heat transfer is found to be the maximum when the hot and cold thermally active locations are placed at the middle of the side walls. © 2008 American Institute of Physics.link_to_subscribed_fulltex