Mixing Through Oscillations and Pulsations—A Guide to Achieving Process Enhancements in the Chemical and Process Industries

Ni, Xiongwei; Mackley, M. R.; Harvey, Adam P.; Stonestreet, P.; Baird, M. H. I.; Rao, N. V. Rama

doi:10.1205/02638760360596928

Cited by 163 publications

(144 citation statements)

References 38 publications

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“…The area between the baffles is highly turbulent and ideally mixed. Very high mass and heat transfer coefficients can be reached in this way [9,10].…”

Section: Oscillatory Baffled Reactorsmentioning

confidence: 97%

IEA SHC Task 49/IV - Deliverable B5 - Potential Enhancement of Solar Process Heat by Emerging Technologies

Muster-Slawitsch¹,

Prosinecki²,

Ahmad³

et al. 2016

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“…The area between the baffles is highly turbulent and ideally mixed. Very high mass and heat transfer coefficients can be reached in this way [9,10].…”

Section: Oscillatory Baffled Reactorsmentioning

confidence: 97%

IEA SHC Task 49/IV - Deliverable B5 - Potential Enhancement of Solar Process Heat by Emerging Technologies

Muster-Slawitsch¹,

Prosinecki²,

Ahmad³

et al. 2016

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“…Meanwhile, studies from Zhang et al [7] showed α = 0.19 are the most appropriate value for dispersion of liquid-liquid solutions. However, Ni et al [8] reported that the range of α with 0.20-0.35 can maximise the fluid mixing effect and minimise the frictional losses. Higher values of α generate narrow vortices and consequently produce poor mixing.…”

Section: Introductionmentioning

confidence: 99%

Oscillatory flow reactor design for biological process

Azaini¹,

Masngut²

2017

J. MECH. ENG. SCI.

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Oscillatory flow reactor (OFR) is a novel type of tubular reactor consisting of equally spaced orifice baffles (sometimes called doughnut baffles) fitted inside the column of the reactor. OFR can be used for biological and chemical processes such as crystallisation of paracetamol, biofuel production, and production of sterols in ester saponification reactions. The aim of the study is to design and fabricate the oscillatory flow reactor for the purpose of biological process. In order to achieve turbulence flow inside the reactor, parameters such as reactor, baffles dimension, and type of oscillation system were considered prior to the design work. Autodesk: AutoCAD ® 2016 was used to draw the reactor parts. The OFR was fabricated in the Faculty of Chemical and Natural Resources Engineering (FKKSA) workshop in Universiti Malaysia Pahang (UMP). A complete OFR consists of three main parts which are reactor column, baffles plate and oscillation system. The OFR column was made from 304 grade stainless steel with dimensions of 500 mm in height and 60 mm internal in diameter so that it can fit in an autoclave and can withstand high temperatures and pressures. Due to the OFR's capability of mixing and transferring oxygen in gas-liquid phase, it was be further tested to evaluate its capability as bioreactor including the characterisation test based on its ability to maintain sterility, fluid loss due to evaporation, and the temperature profile.

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“…The fluid mechanics inside continuous OBRs are governed by geometric parameters (baffle spacing and opened cross-sectional area) and dynamic parameters (Strouhal number, oscillatory Reynold number and net flow Reynold number). 4 Geometric and dynamic parameters play an important role in the reactor design and operation. Scale-up can be performed by maintaining geometric and dynamic similarity.…”

Section: Introductionmentioning

confidence: 99%

Effect of oscillation amplitude on the residence time distribution for the mesoscale oscillatory baffled reactor

Yussof

Bahri

Phan

et al. 2017

Chem. Eng. Res. Bull.

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A recent development in oscillatory baffled reactor technology is down-scaling the reactor, so that it can be used for the applications such as small-scale continuous production of bioethanol. A mesoscale oscillatory baffled reactor (MOBR) with central baffle system was developed and fabricated at mesoscales (typically 5 mm diameter). This present work aims to analyse the mixing conditions inside the MOBR by evaluating the residence time distribution (RTD) against the dynamic parameters of net flow Reynolds number (Re n ) at 4.2, 8.4 and 12.6 corresponding to flow rates of 1.0, 2.0 and 3.0 ml/min respectively, oscillatory Reynolds number (Re o ) between 62 to 622, and Strouhal number (Str) between 0.1 to 1.59. The effect of oscillation frequency and amplitude on RTD performance were studied at frequency, amplitude, and velocity ratio ranging from 4 to 8 Hz, 1 to 4 mm and 1 to 118, respectively. Effect of oscillation frequency has resulted in the variance of the RTD increased as the oscillation frequency increased from 5 Hz to 8 Hz and peak at 6 Hz of 0.264. A further increase in the frequency above 5 Hz caused the RTD to slightly broaden and positively skewed. At frequency of 5 Hz, the RTD profiles were close to Gaussian form for all tested amplitude values from 1 mm to 4 mm. At low amplitudes, i.e. x o = 1 mm, the variance exhibited its minimum around 0.842 at Re o =156. An increase in Re o above 300 resulted in increased in the variance rapidly to 1.28, and later eliminated the plug flow behaviour and the reactor behaved similar to a single continuous stirred tank reactor.

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Mixing Through Oscillations and Pulsations—A Guide to Achieving Process Enhancements in the Chemical and Process Industries

Cited by 163 publications

References 38 publications

IEA SHC Task 49/IV - Deliverable B5 - Potential Enhancement of Solar Process Heat by Emerging Technologies

IEA SHC Task 49/IV - Deliverable B5 - Potential Enhancement of Solar Process Heat by Emerging Technologies

Oscillatory flow reactor design for biological process

Effect of oscillation amplitude on the residence time distribution for the mesoscale oscillatory baffled reactor

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