Please be advised that the site will be down for maintenance on Sunday, September 1, 2024, from 08:00 to 18:00, and again on Monday, September 2, 2024, from 08:00 to 09:00. We apologize for any inconvenience this may cause.
dc.contributor.author | Naraigh, Lennon O.![]() |
|
dc.contributor.author | Jansen van Vuuren, D.R. (Daniel)![]() |
|
dc.date.accessioned | 2021-05-27T14:58:14Z | |
dc.date.available | 2021-05-27T14:58:14Z | |
dc.date.issued | 2020-04 | |
dc.description.abstract | In this article we use analytical and numerical modeling to describe parallel viscous two-phase flows in microchannels. The focus is on idealized two-dimensional geometries, with a view to validating the various methodologies for future work in three dimensions. In the first instance, we use analytical Orr-Sommerfeld theory to describe the linear instability which governs the formation of small-amplitude waves in such systems. We then compare the results of this analysis with an in-house Computational Fluid Dynamics (CFD) solver called TPLS. Excellent agreement between the theoretical analysis and TPLS is obtained in the regime of small-amplitude waves. We continue the numerical simulations beyond the point of validity of the Orr-Sommerfeld theory. In this way, we illustrate the generation of nonlinear interfacial waves and reverse entrainment of one fluid phase into the other. We justify our simulations further by comparing the numerical results with corresponding results from a commercial CFD code. This comparison is again extremely favourable—this rigorous validation paves the way for future work using TPLS or commercial codes to perform extremely detailed three-dimensional simulations of flow in microchannels. | en_ZA |
dc.description.department | Graduate School of Technology Management (GSTM) | en_ZA |
dc.description.librarian | hj2021 | en_ZA |
dc.description.uri | http://www.techscience.com/journal/fdmp | en_ZA |
dc.identifier.citation | Náraigh, L.O. and Jansen van Vuuren, D.R. (2020). Linear and Nonlinear Stability Analysis in Microfluidic Systems. FDMP-Fluid Dynamics and Materials Processing, 16(2), 383–410. | en_ZA |
dc.identifier.issn | 1555-256X (print) | |
dc.identifier.issn | 1555-2578 (online) | |
dc.identifier.other | 10.32604/fdmp.2020.09265 | |
dc.identifier.uri | http://hdl.handle.net/2263/80146 | |
dc.language.iso | en | en_ZA |
dc.publisher | Tech Science Press | en_ZA |
dc.rights | This work is licensed under a Creative Commons Attribution 4.0 International License. | en_ZA |
dc.subject | Multiphase flow | en_ZA |
dc.subject | Computational fluid dynamics (CFD) | en_ZA |
dc.subject | Interfacial instability | en_ZA |
dc.subject | TPLS | en_ZA |
dc.title | Linear and nonlinear stability analysis in microfluidic systems | en_ZA |
dc.type | Article | en_ZA |