粒子测速仪时间分辨粒子成像测速系统(TR-PIV)LaVision 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.

     FlowMaster High-Speed 系统为流体动力学分析提供了新的研究手段。它同时提供了基于数字PIV的空间流场信息和每一点随时间的演化信息。
 测试系统功能和性能指标：
 系统功能：

1.   系统可以测量速度及加速度场
2.   湍流过程的脉动参量。
3.   提供随时间演化的速度场及其相关信息
4.   获得随时间变化的湍流信息等。
5.   基于时间域的本征正交分解——POD-模式分解
6.   漩涡结果特性随时间的变化规律
7.   时空相关
8.   流动结构跟踪
9.   能量谱
10.   加速度场
11.   流动的时间尺度。
      系统指标：
12.   LaVision提供的FlowMaster
      High-Speed系统包含根据尖端技术设计的全数字化高速相机，拍摄帧率在1k x 1k像素分辨率下可以达到 5
      kHz，降低图像分辨率拍摄帧率可以达到100 kHz。
13.   高重复频率单腔或双腔固体激光器，每脉冲能量可以达到50 mJ。
14.   所有硬件部件都可以DaVis软件包集成和控制。

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