Host: The Japan Society of Mechanical Engineers
Name : Mechanical Engineering Congress,Japan
Date : September 11, 2016 - September 14, 2016
We propose a novel technique to drive turbulent mixing of a fluid confined in a smooth container. It is a weak precession of the container that can lead to strong turbulence of the confined fluid. By our extensive laboratory experiments and direct numerical simulations, we have revealed that the optimal rate of precession for the fastest mixing is about ten percent of the spin, and that symmetric containers such as a sphere are much better at sustaining turbulence than asymmetric ones. Only about ten spins are required to complete the mixing in a precessing sphere with precession rate being about 0.09-0.1.
