Author/Authors :
Sheikhzadeh, G. A Department of Mechanical Engineering, University of Kashan,Ghotb Ravandi Blvd, Kashan , Hajialigol, N Department of Mechanical Engineering, University of Kashan,Ghotb Ravandi Blvd, Kashan , Ebrahim Qomi, M Department of Mechanical Engineering, University of Kashan,Ghotb Ravandi Blvd, Kashan , Fattahi, A Department of Mechanical Engineering, University of Kashan,Ghotb Ravandi Blvd, Kashan
Abstract :
The fluid flow and heat transfer in lid-driven enclosures filled with
Cu-water nanofluid is numerically investigated. The moving vertical
walls of the enclosure are maintained in a constant temperature,
while the horizontal walls are insulated. The hybrid scheme is used
to discretize the convection terms and SIMPLER algorithm is
adopted to couple the velocity field and pressure in the momentum
equations. The effect of moving direction of walls on mixed
convection is studied for various Ri numbers, aspect ratios and
volume fractions of nanoparticles. For this purpose, vertical walls
are moved in two directions: one, force convection aids to free
convection and two, it interacts to free convection. It is observed that
the direction of moving wall mainly affected the flow field,
temperature gradient and heat transfer. In addition, by increasing the
volume fraction of nanoparticles, the variation of average Nusselt
number on the hot wall, as an index of heat transfer rate, is linear in
two cases.
Keywords :
Lid‐driven enclosure , Laminar mixed convection , Nanofluid , Aspect ratio
