Purpose -In the present paper, the authors aim to analyze the non-Newtonian effects of Rabinowitsch fluids on the squeeze film performances between wide parallel rectangular plates. Design/methodology/approach -Based on the cubic-stress equation model, a nonlinear squeeze-film Reynolds-type equation has been derived. By using a small perturbation method, a closed-form solution of the squeeze film characteristics is derived for the parallel plates considering the nonNewtonian effects of cubic stresses. Findings -Comparing with the Newtonian-lubricant parallel plates, the effects of non-Newtonian cubic-stress flow rheology provide significant influences upon the squeeze film characteristics. Originality/value -It is shown that the non-Newtonian pseudoplastic behavior reduces the load capacity and the response time; however, the effects of non-Newtonian dilatant lubricant provide an increase in the load-carrying capacity and therefore lengthen the response time of parallel squeeze-film plates.

Centrifugal force has been found to be an excellent method to control fluidic flow in biochips. Most micro-fluidics researchers already use the computer to simulate micro-fluidics flow behavior to save time and reduce mistakes. In this study, the overflow design accurately fixes the liquid volume with less than 5% error. Centrifugal force driven micro-fluidics system is designed with both simulation and experiment. The 3D simulations to utilize computational fluid dynamic software (CFD) to simulate the fluid flow and calculate burst frequency at different capillary switching and several dimension of micro-channels (300, 400, 500μm wide and each 200μm deep). For mercurochrome, the simulation results (384, 360, 348 rpm) shows burst frequency matches experimental results (468, 426, 402rpm) and accurately predicts measured trends followed the effect of channel width. This study also demonstrates the centrifugal application of an advanced computational fluidic dynamics model for the design and analysis of a centrifugal force driven micro-fluidics system.