Calculation of electro-osmotic flow development length in a rotating three-dimensional microchannel

Abstract

The numerical modeling of an electroosmosis flow in a rectangular three-dimensional rotating microchannel has been studied. The study’s goal is to calculate the flow’s development length, and as a novelty, a correlation is proposed to estimate the development length. The flow was simulated for angular velocity (ω) ranges of 0–9 and electric potential (φ) ranges of 0.1–0.3. The results were imported into the curve fitting toolbox to determine a correlation for the development length. The correlation was obtained as a function of angular velocity, electric potential, and hydraulic diameter. The results show that increasing both ω and φ leads to an increase in flow development length, where for constant φ, increasing ω from 0 to 9 results in a 20%–30% increase in development length. Furthermore, increasing φ from 0.1 to 0.3 for a constant ω raises development length by 35%–50%. The velocity field and its parameters, such as ω and φ, were analyzed and discussed.

Stability analysis of electro-osmotic flow in a rotating microchannel

“…It is worth mentioning here that pertaining to rotational flows in lab-on-a-chip-based centrifugal microfluidic systems/devices, used largely in medical diagnostics, biochemical analysis and laboratory instruments cooling, the deployment of electro-osmotic effect offers a few distinctive features, namely noise-free operation, minimally invasive actuation process, and a greater degree of flow controllability, to name a few (Ajdari 1995(Ajdari , 1996Chakraborty 2006;Mondal et al 2013;Barimani, Jamei & Abbasi 2022). Despite having such inevitable beneficial aspects of the electro-osmotic effect, employment of this flow actuation parameter in rotational platforms leads to a few problematic facets, including a stability issue of the underlying flow (Zhang et al 2013).…”