The present study proposes novel micro-jet impingement heat sink with effusion holes for flow extraction. The design consists of impingement nozzles surrounded by multiple effusion holes to take away the spent fluid. A three-dimensional numerical model is used for steady, incompressible, laminar flow and conjugate heat transfer for the performance analysis of the proposed design. The computatio...

For aerospace or hypersonic cruise vehicle the state of the boundary layer is of great importance because for turbulent boundary layers, the thermal loads and skin friction are higher than in laminar boundary layers. Therefore , knowledge of cooling features and laminar-turbulent transition is necessary for the design of the thermal protection system (TPS). Different strategies are used to redu...

Direct numerical simulations (DNS) are carried out to investigate the effect of effu-sion cooling by blowing through spanwise slits and discrete holes in a laminar flat-plate boundary layer at various Mach numbers. The comparison with experimental data for a Mach-2.67 boundary layer with a cool wall and a spanwise slit shows good agreement. For an adiabatic Mach-6 boundary layer, the focus of t...

Multirow film cooling is an advanced method to provide effective surface for gas turbine components exposed high temperature. In this paper, the performance of multirow under different configurations investigated numerically. The geometrical parameters, including hole arrangement, orientation, and trenched hole, are considered. numerical setup validated before performances compared. flow heat t...

Direct numerical simulations (DNS) are carried out to study the laminar stability properties of an effusioncooled adiabatic flat-plate boundary layer at Mach 6. Through four aligned rows of holes, cold gas is blown into the boundary layer at the wall and background disturbances are excited at the wall upstream of the holes. Two cases are compared, with small and large spanwise spacing of the ho...

The influence of effusion cooling through discrete holes on a laminar Ma-2.67 boundary layer is investigated using direct numerical simulation (DNS). It is found that the wall condition, isothermal, adiabatic or radiation-adiabatic, with neglected heat conduction within the wall, has a very strong influence on the vortex systems that are generated by the holes and thus also on the cooling featu...

we report a rare case of brucellosis presenting with pleural and pericardial effusions in a 35 year-old male rancher in iran with fever and dyspnea. such findings should prompt inclusion of brucellosis in the differential diagnosis in endemic areas.