On the Effects of Processing Faults on the Velocity Field in Microchannels

摘要

The microchannel flow exists in most of microfluidic chips. The velocity field affects the performance of microfluidic chips. The flow field is always changed by the concave holes caused by air dust on the microchannel surface. In this approach, a two- dimensional computational fluid dynamics (CFD) model is put forward to study the effect of concave holes on flow field in microchannels. The influenced area of single hole or two concave holes is studied for the case of laminar flow. Numerical results indicate that the ratio of the half channel height to the hole diameter and the distance between holes have strong influence on the flow field. The results can be used to choose the class of cleanroom for chip manufacture and evaluating the usefulness of chip with the concave holes.