The physical problem studied by the mathematical model is the fluid-solid coupling problem. According to its flow and heat transfer characteristics, the convection model in the mathematical model is based on the assumption that the fluid in the space shown is Boussinesq-type fluid; the rib base is in contact with the circuit board. Part of the non-heating surface air and the fan blow the wind just across the rib base, and the flow state around it is symmetrical, the volume is also small, the air is almost no flow, so the heat transfer is small, negligible, that is, the insulating wall; along the rib The temperature gradient in the thickness direction is zero because the rib thickness is very thin, which simplifies the calculation grid of the ribs; since there is a structure in the flow channel that abruptly changes the velocity direction, fluids of different layers are blended in these places. So, the turbulence model is applied to simulate. The flow and heat transfer are three-dimensional steady-state turbulence of forced convection heat transfer of air. The turbulence model used is the standard k-ε two-equation model. In addition, the solid heat transfer model in the mathematical model is two-dimensional steady state heat conduction. Boundary conditions: the inlet wind speed is 4.139 m / s, the temperature is 300K, the venting surface diameter is 66 mm; the heat flow density of the heating surface is . The exit boundary is set as the pressure outlet condition, that is, static Pa. In the actual calculation, it is found that the OUT-FLOW free exit condition does not easily converge when calculating the mass split problem, so the pressure outlet condition is selected. Grid evaluation In this paper, the hexahedral mesh was selected because the geometry of the calculation model and the direction of the fluid inlet and outlet were relatively regular. For the size of the mesh, since the heat capacity of the fluid is low, it is easy to flow, and the physical quantity changes more everywhere than the solid. In the fluid calculation area, the number of meshes is large and the size is small. Bonded Fin Heat Sink,Folded Fin Heatsink,Bonded Fin Heatsinks,Bonded Heat Sink Suzhou Wint Electric Co., Ltd , https://www.winforthermal.com