对流离子风对热传导的增强效应

2013/09/25   下载量： 3 次

方案摘要

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应用领域 电子/电气
检测样本 其他
检测项目
参考标准 暂无

全场测试。测试对象为辉光放电中的等离子体。和理论计算模拟相对比。对于电子设备散热，器件热传导规律的认识有借鉴和参照意义。

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The increasing complexity of electronic devices and components challenges

conventional cooling techniques. For continued development in the electronics field,innovative cooling techniques are required. This thesis examines heat transfer enhancement of a heated plate experiencing low-velocity forced convection. A wire-torod corona discharge electrode configuration was used to generate a counter-flow ionic wind so as to direct the bulk gas flow in such a manner as to induce hot spot cooling.

Particle image velocimetry (PIV) studies were conducted to profile the interaction

between the bulk flow and counter-flow ionic wind and show how the hydrodynamic

interactions result in a downward flow towards the heated surface and characteristic recirculation zones. This impingement-like effect enhanced the convection cooling of the heated plate, reducing the temperature by as much as 5 K. Convection coefficient was enhanced by up to 36% in the heat transfer experiments. In the PIV experiments,seeding particles were used to obtain the fluid flow profile. As corona discharge creates a charged environment, seeding particles may get charged, and this may result in deviation from fluid flow due to Coulombic forces on the particles. To ensure the fidelity of the PIV results in these experiments, a simplified particle tracking analysis was

conducted, solving the modified Basset-Boussinesq-Oseen (BBO) equation for particle

motion and including charging and electric field effects to simulate the effects of corona discharge. The results obtained from these simulations were used to affirm the validity of the PIV results.


上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 应用热成像磷光粒子进行高速平面温度和速度场测量

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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