Volume 18, Issue 1, January 2006
Index of content:
18(2006); http://dx.doi.org/10.1063/1.2162184View Description Hide Description
Fluid mixing in a Hele–Shaw cell can be accomplished by periodically pulsing pairs of sources and sinks. The mixing efficiency of this system depends largely on the volume of fluid that is injected (and extracted) during each pulse. In this paper, the authors use a two-dimensional potential flowmodel to find the pulse volumes that optimize mixing in a rectangular domain containing two source–sink pairs, a system of current interest in DNAmicroarrayanalysis. Optimal mixing protocols are identified by determining maximum entropy using an analysis of chaotic advection.
18(2006); http://dx.doi.org/10.1063/1.2162185View Description Hide Description
A new numerical simulation of a turbulent channel in a large box at is described and briefly compared with simulations at lower Reynolds numbers and with experiments. Some of the fluctuation intensities, especially the streamwise velocity, do not scale well in wall units, both near and away from the wall. Spectral analysis traces the near-wall scaling failure to the interaction of the logarithmic layer with the wall. The present statistics can be downloaded from http://torroja.dmt.upm.es/ftp/channels. Further ones will be added to the site as they become available.