Research On Heat Dissipation Performance Of Magnesium Alloy Foam Of Medium Porosity

Now, the main development direction of electronic products are high performance, multi-function, miniaturization and high efficiency. But the high integrated products can produce a large amount of heat in use. If the heat are not dispersed out in time,it will gather around the core components to influence its performance.Therefore, the heat dissipation of electronic products become the main constraint on its rapid development. Foamed magnesium is expected an alternative material to make the radiator, because of its larger specific surface area and thermal conductivity of the metal skeleton with high strength and hardness.The heat dissipation property of the foamed magnesium under the condition of forced convection and natural convection was simulated using FLUENT software and compared with the results of experiments.(1)The heat dissipation property under the forced convection was investigated based on the computer CPU radiator. The results showed: 1) the heat dissipation effect of the foamed magnesium was better than the traditional CPU radiator; 2) the pore structure parameters, porosity and pore size were the key factors influencing the dissipation property of the foamed magnesium; 3)the surface heat transfer coefficient and the pressure drop value of the foamed magnesium decreased with the increase of porosity and pore size, so the larger porosity and pore size could lead to better dissipation property of the foamed magnesium.(2)The heat dissipation property under the natural convection was investigated based on the LED lamp radiator using orthogonal test. The results showed: 1) the heat dissipation effect of the foamed magnesium was better than the traditional LED lamp radiator; 2) the porosity and pore size of the foamed magnesium and the radiator base thickness affected the heat dissipation, the influence degree of pore size was the largest, followed by porosity, and the base thickness the least; 3) the optimun structural parameters of the foamed magnesium were determined as:the pore siz 1.9 mm, porosity 60% and no base.(3)At the same conditions, comparing the experimental and simulation results, it was showed that the simulation results are in good agreement with the experimental results, the foamed magnesium radiator was able to replace traditional radiator to reduce the temperature of electronic components under the condition of the forced convection and the natural convection.