对流离子风对热传导的增强效应

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.