体视层析粒子成像测速系统(Tomo-PIV)FlowMaster-Tomo粒子测速仪 对流离子风对热传导的增强效应

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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.

字化过程，该技术可以在颗粒浓度相对很高的情况下获得高分辨率速度场，而3D

粒子跟踪测速仅能适用于颗粒浓度较低的情况(从而得到的速度矢量场的空间分辨

率也很低 )。这种方法获得的是完全空间体积内的瞬时结果，与平面PIV扫描式工

作不同，它很适合需要双曝光间隔dt 很小的高速流动以及利用高帧率相机进行高

时间分辨率进行测量的情况。

 湍流研究
 三维流体结构的可视化
 完整的三维漩涡分析
 流体结构的相互作用
 

在测量体内的示踪颗粒由高能量的脉冲激光光源照亮，其散射光由4个不同方向拍

摄的CCD相机记录下来，然后由三维空间中每一点光强的分布， 利用层析重构算

法(MART)对三维空间颗粒的分布进行重构。给定的三维诊断区域中颗粒的位移是

通过双曝光形成的两个重构颗粒图像进行三维互相关获得的，其中利用了变形立体

网格的多重网格迭代算法。      

         层析PIV(Tomo-PIV)是一种全新的三维速度场测量技术。颗粒的速度信息是
 由在顺序两次曝光时刻重构出来的粒子三维图像的互相关处理得到的。通过全数

体视层析粒子成像测速系统(Tomo-PIV)FlowMaster-Tomo粒子测速仪 对流离子风对热传导的增强效应信息由北京欧兰科技发展有限公司为您提供，如您想了解更多关于体视层析粒子成像测速系统(Tomo-PIV)FlowMaster-Tomo粒子测速仪 对流离子风对热传导的增强效应报价、型号、参数等信息，欢迎来电或留言咨询。

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