Natural Convection Inside the Open Square Enclosure with Diagonally Placed Twin Square Blocks

作者：Kalidasan K^*; Velkennedy R; Kanna P Rajesh

来源：Arabian Journal for Science and Engineering, 2014, 39(11): 8265-8277.

DOI：10.1007/s13369-014-1386-y

• Laminar flow
• Natural convection
• Nusselt number
• Square block

A finite difference-based numerical study of steady laminar natural convection inside the ventilated square enclosure having two square cylindrical blocks placed diagonally is presented. The fluid considered is air with a Prandtl number of 0.71. The buoyancy enabled cold air flows from bottom of the left vertical wall to the diagonally opposite top of the right vertical wall by passing the protrusions in the form of two conductive square blocks placed across the through flow. All the exterior circumferential walls are considered as hot. The convective heat transfer inside the enclosure with the different sizes of square blocks is numerically analyzed. The convective heat transfer mechanism inside the enclosure is further modified through the Rayleigh number as 10(4), 10(5) and 10(6). The hydrodynamic block effect due to the square blocks affects the formation and geometry of the vortices and also influences the heat transfer intensities across the enclosure. The hydrodynamic blockage has huge effect on the downstream side of the block than the upstream side. The size of the blocks has great impact on the intensity of heat transfer. The complex physics is illustrated with streamlines, isotherms, local Nusselt number and velocity profiles.

• 出版日期2014-11