2010

Authors

  • Jayaprakash Sivasamy Jayaprakash Sivasamy
  • Zhizhao Che Zhizhao Che
  • Teck Neng Wong Teck Neng Wong
  • Nam-Trung Nguyen Nam-Trung Nguyen
  • Levent Yobas Levent Yobas

A simple method for evaluating chaotic advection in slug micromixing is reported in this paper. We consider a slug moving in a slit microchannel (w?h)(w?h) and flow field in a plane far from the boundary walls is modelled as a two-dimensiol low-Reynolds-number flow (Stokes flow). Alytical solution for normalised velocity field in the slug is derived. The two-dimensiol alytical solution is compared with the two-dimensiol slice from the three-dimensiol numerical solution of the slug velocity field. Boundary conditions mimicking the motion of the slugs in microchannel geometries, in Lagrangian frame of reference, is used to track the passive tracer particles using Lagrangian particle tracking method. Poincar頳ections and dye advection patterns are used to alyse chaotic advection of passive tracer particles using statistical concepts such as 'variance', 'Shannon entrophy' and 'complete spatial randomness'. Results for boundary conditions mimicking constant-velocity straight-channel flow, constant-velocity normal-meandering channel flow are compared. A method for finding new channel geometries which enhance chaotic mixing is also proposed.