Assessment of mixing problem on the EOF with thermal effects

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 376; no. 1; pp. 53 - 58
• Main Authors: Kim, H., Kwak, H.S., Westerweel, J.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier B.V 20.02.2011; Elsevier
• Subjects: Assessments; Boundary conditions; Channels; Chemistry; Convection modes; Diffusion; Dispersions; Effective diffusion coefficient; Electroosmotic flow; Exact sciences and technology; General and physical chemistry; heat production; Laminar flow; Microchannel; Mixing; Taylor–Aris dispersion; temperature; Temperature-dependent physical properties; Thermally driven electroosmotic Couette flow; Walls; Electroosmotic flow; Mixing; Microchannel; Temperature-dependent physical properties; Thermally driven electroosmotic Couette flow; Taylor–Aris dispersion; Effective diffusion coefficient; Peclet number; Electrokinetics; Potential; Boundary condition; Taylor-Aris dispersion; Physical properties; Convection; Dispersion; Laminar flow; Efficiency; Couette flow; Models; Diffusion coefficient; Diffusion
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2010.09.032

A potential of mixing applications on an electroosmotic flow (EOF) with thermal effects is examined. For the thermal conditions, we apply the sinusoidal temperature boundary conditions on the walls. We exemplify two cases: (1) the mixing of laminar flows and (2) Taylor–Aris dispersion model. In the first case, we consider to mix two different samples that flow in parallel along the channel. In addition, by scaling analysis, we qualitatively examined the mixing result. The mixing efficiency is proportional to the temperature difference. Through the Taylor–Aris dispersion model, we found that the temperature gives rise to an increase of the D eff( T) at the low Peclet number where the diffusion and convection effect coexist.