### A Numerical Study of Vorticity-Enhanced Heat Transfer

- Series
- Dissertation Defense
- Time
- Tuesday, June 24, 2014 - 14:05 for 1 hour (actually 50 minutes)
- Location
- Skiles 005
- Speaker
- Xiaolin Wang – School of Mathematics, Georgia Tech

In this work, we numerically studied the effect of the vorticity on the
enhancement of heat transfer in a channel flow. Based on the model we
proposed, we find that the flow exhibits different properties depending on
the value of four dimensionless parameters. In particularly, we can
classify the flows into two types, active and passive vibration, based on
the sign of the incoming vortices. The temperature profiles according to
the flow just described also show different characteristics corresponding
to the active and passive vibration cases. In active vibration cases, we
find that the heat transfer performance is directly related to the strength
of the incoming vortices and the speed of the background flow. In passive
vibration cases, the corresponding heat transfer process is complicated and
varies dramatically as the flow changes its properties. Compared to the
fluid parameters, we also find that the thermal parameters have much less
effect on the heat transfer enhancement. Finally, we propose a more
realistic optimization problem which is to minimize the maximum temperature
of the solids with a given input energy. We find that the best heat
transfer performance is obtained in the active vibration case with zero
background flow.