Taylor vortex center, film thickness, velocity and frequency of circulations in slugs and plugs for non-Newtonian and Newtonian fluids in two-phase Taylor flow in microchannels. (15th March 2022)

• Record Type: Journal Article
• Authors: Abiev, Rufat Sh.
• Is Part Of: Chemical engineering science. Volume 250(2022)
• Publication Date: 2022-03-15
• Subjects: Microchannel -- Microreactor -- Two-phase Taylor flow -- Non-Newtonian fluid -- Newtonian fluid -- Taylor vortices; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2021.117380
• Languages: English
• ISSNs: 0009-2509

Abstract

Graphical abstract: Highlights: Mathematical model of two-phase Taylor flow for non-Newtonian fluids is extended. Center and border of vortices, mean velocity and frequency of circulation are found. Conditions of transition from circulation to by-pass mode of Taylor flow. The film around the liquid plug is the only area not involved in Taylor circulations. The coincidence with the Newtonian fluids as a limiting case was checked. Abstract: Based on the recently published mathematical model for non-Newtonian two-phase flow in microchannels (Abiev, 2022) an extension that allows to calculate the majority of important parameters of two-phase Taylor flow for non-Newtonian fluids was developed and is presented in this paper. The following parameters could now be calculated theoretically for two-phase Taylor flow of non-Newtonian fluids (both for liquid slug and liquid plug): (i) the center of Taylor vortices, (ii) their boundaries, (iii) mean velocities and frequency of circulation, (iv) mean velocities in by-pass and transit films, and (v) transition from circulation to by-pass flow conditions. The coincidence with the Newtonian fluids as a limiting case was evaluated. The obtained results represent crucial input data for the three-layer mass transfer model, the frequency of circulation-based mass transfer model, and are useful for the understanding of the influence of various parameters on heat and mass transfer intensity in Taylor flows.