对流离子风对热传导的增强效应

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方案摘要

The increasing complexity of electronic devices and components challengesconventional cooling techniques. For continued development in the electronics field,innovative cooling techniques are required. This thesis examines heat transferenhancement of a heated plate experiencing low-velocity forced convection. A wire-torodcorona discharge electrode configuration was used to generate a counter-flow ionicwind 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 interactionbetween the bulk flow and counter-flow ionic wind and show how the hydrodynamicinteractions result in a downward flow towards the heated surface and characteristicrecirculation zones. This impingement-like effect enhanced the convection cooling ofthe heated plate, reducing the temperature by as much as 5 K. Convection coefficientwas 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 createsa charged environment, seeding particles may get charged, and this may result indeviation from fluid flow due to Coulombic forces on the particles. To ensure the fidelityof the PIV results in these experiments, a simplified particle tracking analysis wasconducted, solving the modified Basset-Boussinesq-Oseen (BBO) equation for particlemotion and including charging and electric field effects to simulate the effects of coronadischarge. The results obtained from these simulations were used to affirm the validityof the PIV results.

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