Actively homogenizing fluid distribution and slug length of liquid-liquid segmented flow in parallelized microchannels

Arsenjuk, Linda; Vietinghoff, Niclas von; Gladius, Anoj Winston; Agar, David W.

doi:10.1016/j.cep.2020.108061

Cited by 9 publications

(13 citation statements)

References 47 publications

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“…Arsenjuk et al and Vietinghoff et al developed systems where the slug length at the reactor inlet is measured by an optical sensor shown in Fig. 7 consisting of a double infrared gate, where the passage of aqueous slugs through the infrared beam results in a reduction in measured beam intensity [29,30]. The slug flow is formed in the slug generator shown in Fig.…”

Section: Flow Experiments and Resultsmentioning

confidence: 99%

“…However, recalling the dependence of recirculation time on slug velocity it is seen that the mixing characteristics of the system, like the stirring speed of Fig. 7 Optical sensor [11,29] Fig. 8 Slug Generator [19] a batch reactor, is another control variable that affects the system in a non-trivial way [16,18].…”

Section: Flow Results-effect Of Length Of Flow Reactormentioning

confidence: 99%

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Slug flow as tool for selectivity control in the homogeneously catalysed solvent-free epoxidation of methyl oleate

et al. 2021

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Catalytic oxidation of sustainable raw materials like unsaturated fats and oils, or fatty acids and their esters, lead to biobased, high-value products. Starting from technical grade methyl oleate, hydrogen peroxide as a green oxidant produces only water as by-product. A commercially available, cheap water-soluble tungsten catalyst is combined with Aliquat® 336 as a phase-transfer agent in solvent-free reaction conditions. In this study, we first report the transfer of this well-known batch system into continuous mode. The space–time yield is improved from 0.08 kg/L.h in batch to 1.29 kg/L.h in flow mode. The improved mass transfer and reduced back mixing of the biphasic liquid–liquid slug flow allows for selectivity control depending on physical parameters of slug flow namely volumetric phase ratio, volumetric flow rate, and slug length. Even though the product, methyl 9,10-epoxystearate is obtained at a maximum selectivity of only 58% in flow mode, higher space time yield combined with possible reactant recycling in flow mode offers a promising avenue of research. This work analyses the use of slug flow parameters as tools for controlling selectivity towards oxidation products of methyl oleate.

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Section: Flow Experiments and Resultsmentioning

confidence: 99%

Section: Flow Results-effect Of Length Of Flow Reactormentioning

confidence: 99%

Slug flow as tool for selectivity control in the homogeneously catalysed solvent-free epoxidation of methyl oleate

et al. 2021

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“…Soumya Bandyopadhyay, Suman Chakraborty [98] investigated the thermophoretic force effect and the interfacial tension by studying Newtonian fluid dynamics in a microchannel with the consideration of temperature dependency of viscosity. Linda Arsenjuk et al [99] investigated the slug flow in parallelized microchannel and obtained static fluid distribution with high-pressure loss. Zan Wu et al [100] analyzed the slug flow in a square microchannel and correlated the velocity of the slug in terms of the Capillary number using bulk velocity and continuous phase viscosity.…”

Section: Flow Boiling In Mchsmentioning

confidence: 99%

Recent Advancements in Thermal Performance Enhancement in Microchannel Heatsinks for Electronic Cooling Application

Korasikha¹,

Sharma²,

Rao³

et al. 2021

Heat Transfer - Design, Experimentation and Applications

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Thermal management of electronic equipment is the primary concern in the electronic industry. Miniaturization and high power density of modern electronic components in the energy systems and electronic devices with high power density demanded compact heat exchangers with large heat dissipating capacity. Microchannel heat sinks (MCHS) are the most suitable heat exchanging devices for electronic cooling applications with high compactness. The heat transfer enhancement of the microchannel heat sinks (MCHS) is the most focused research area. Huge research has been done on the thermal and hydraulic performance enhancement of the microchannel heat sinks. This chapter’s focus is on advanced heat transfer enhancement methods used in the recent studies for the MCHS. The present chapter gives information about the performance enhancement MCHS with geometry modifications, Jet impingement, Phase changing materials (PCM), Nanofluids as a working fluid, Flow boiling, slug flow, and magneto-hydrodynamics (MHD).

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“…Mendorf et al 13 passten hingegen iterativ die Längen der verwendeten Kapillaren an, um die Ungleichverteilung der Druckverluste auszugleichen. Dem gegenüber überwachten Antweiler et al 14 und Arsenjuk et al 15 durch Sensoren die Volumenströme in den Kapillaren und glichen Ungleichverteilungen durch thermorheologische Ventile als regelbare Druckverluste aus. Die bisherigen Ansätze konnten in der Praxis jedoch noch nicht mehr als acht Mikroapparate gleichzeitig betreiben und wiesen noch keine perfekte Gleichverteilung der Volumenströme auf.…”

Section: Introductionunclassified

Kreuz‐Gegenstrom‐Verschaltung zum Numbering‐up der Pfropfenströmung zu Extraktionszwecken

Schwarz

Mendelawi

Agar

2021

Chemie Ingenieur Technik

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In der Mikroverfahrenstechnik limitiert die Miniaturisierung den maximalen Durchsatz einer m-Mixer-Settler-Einheit. Eine Steigerung der Produktion kann daher nur durch die Parallelisierung mehrerer Extraktionseinheiten erfolgen. Ein Strang aus n im Gegenstrom verschalteten Stufen beno ¨tigt dabei n + 1 Pumpen, der parallele Betrieb von m Stra ¨ngen bereits m (n + 1) Pumpen. Ein neues Verschaltungskonzept wird vorgestellt, das die notwendige Pumpenzahl auf 2m + n -1 reduziert. Das Konzept wird theoretisch diskutiert. Experimente belegen die prinzipielle Realisierbarkeit der Fluiddynamik.

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Actively homogenizing fluid distribution and slug length of liquid-liquid segmented flow in parallelized microchannels

Cited by 9 publications

References 47 publications

Slug flow as tool for selectivity control in the homogeneously catalysed solvent-free epoxidation of methyl oleate

Slug flow as tool for selectivity control in the homogeneously catalysed solvent-free epoxidation of methyl oleate

Recent Advancements in Thermal Performance Enhancement in Microchannel Heatsinks for Electronic Cooling Application

Kreuz‐Gegenstrom‐Verschaltung zum Numbering‐up der Pfropfenströmung zu Extraktionszwecken

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