Bubble dynamic behaviours at various capillary orifices in a bioreactor with methane oxidizing bacteria suspension

Tang, Qin‐Yuan; Pei, Hanjun; Guo, Fei

doi:10.1002/cjce.23016

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…To sum up, many researchers have paid attention to the formation of bubbles in flowing liquid. However, unlike the dynamic behaviour of bubbles forming at these common orifices mentioned above, according to some works reported by Guo's group, [ 41–43 ] a phenomenon of bubble inrush can be observed when bubbles emerged from a micro‐capillary orifice submerged in a stagnant liquid. Unfortunately, to date, there are few reports on bubbling at micro‐capillary orifice in a flow channel.…”

Section: Introductionmentioning

confidence: 90%

Experimental investigation on dynamic behaviour of bubbles emerging from micro‐capillary orifice in a flow channel

et al. 2022

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The flow phenomenon of liquid with bubbles is widespread in various industrial fields, which determines the mass transfer characteristics of the equipment. In this work, the dynamic behaviour of bubbles emerging from micro-capillary orifice in a flow channel was studied by a visualization experiment, while the effects of gas flow rate and liquid flow rate on these processes of bubble growth, departure, and inrush were explored. The experimental results showed that one bubble formation cycle can be divided into three stages: Waiting, departure, and inrush, as well as the dynamic behaviour of bubble emerging from micro-capillary orifice in a flow channel, were significantly affected by gas flow rate and liquid flow rate. At a higher gas flow rate, the growth time and the departure time were shorter, as well as the departure volume of the leading bubble and the inrush volume of the trailing bubble were smaller, while the transverse longitudinal ratio fluctuated more violently, and the swing amplitude of the bubble centroid was greater. With an increasing liquid flow rate, the growth time, the departure time, and the inrush time shortened, while the departure volume of the leading bubble decreased and the fluctuation of the bubble centroid weakened. These findings are conducive to improving the performance of the equipment by optimizing the design of the aerator to regulate the dynamic behaviour of bubbles.

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Section: Introductionmentioning

confidence: 90%

Experimental investigation on dynamic behaviour of bubbles emerging from micro‐capillary orifice in a flow channel

et al. 2022

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“…At present, methane is usually pumped into a bioreactor via an aeration system . Under such circumstances, bubbles firstly form at capillary orifices submerged in a bacterial suspension . Then, methane in bubbles diffuses into the bacterial suspension via the gas‐liquid interface and, subsequently, is converted by methane oxidizing bacteria .…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of coalescence behaviour of bubble pairs forming at capillary orifices submerged in bacterial suspension

et al. 2019

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Coalescence behaviour of bubble pairs markedly affected methane bioconversion because methane is usually pumped into a bacterial suspension through an aeration system, forming bubbles at capillary orifices. In the present work, a bioreactor was developed to observe the coalescence behaviour of bubble pairs forming at capillary orifices submerged in bacterial suspension via a visualization experiment. The results indicated that in a bacterial suspension the inrush bubble number decreased and the inrush time shortened, but the contact time was prolonged and the maximum contact area increased compared to those in pure water. Moreover, with an increase in the gas flow rate, the maximum contact area decreased and the contact time shortened, while more trailing bubbles merged into the leading bubble. Furthermore, the increase in the centre distance was conducive to increasing the maximum contact area and prolonging the contact time but the bubble inrush was observed at a centre distance of 0.94 mm. In addition, the larger centre distance enhanced the oscillation amplitude and frequency of the aspect ratio, which had not significantly changed at different gas flow rates. The results of this study will contribute to the optimal design of an aeration system that enhances the performance of the bioreactor.

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“…Zhao et al visually studied the distribution and behavior of microalgae at the gas–liquid interface in microalgae suspension and analyzed the carbon dioxide bubbles coalescence characteristic at capillary orifices. Pei et al investigated bubble dynamic behavior at capillary orifice using a bioreactor with methane‐oxidizing bacterial suspension. Although the existing works have explored bubble dynamic behavior characteristics, the different bubble dynamic behaviors caused by biochemical reactions and adsorption of microorganisms at the gas–liquid interface have not been well understood in a confined space bioreactor with bacterial suspension.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on bubble dynamic behavior in a confined space bioreactor with bacterial suspension

Guo

Tang

Pei

2017

Asia-Pacific J Chem Eng

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In this work, a confined space bioreactor with bacterial suspension was developed to experimentally investigate the adsorption of microorganisms at the gas-liquid interface and the effects of inner diameter, inclined angle, and gas flow rate on bubble dynamic behavior. The results indicated that the adsorption of microorganisms at the gas-liquid interface was affected by the bacterial chemotaxis and the gas-liquid interface expansion, and the confined space was conducive to accelerate the detachment of smaller bubble and exacerbate the fluctuation of gas-liquid interface. Moreover, the larger inner diameter induced that the bubble was squeezed by the 2 side walls of the confined space bioreactor, restricting the bubble shocking and slowing down the bubble rising velocity for increasing the bubble residence time. Furthermore, the smallest bubble departure size and the shortest inrush time were observed at horizontal capillary orifice, but the largest inrush bubble number was obtained at down-45°capillary orifice. In addition, the inrush bubble number increased with increasing gas flow rate, but the bubble departure sizes were not much different. The results can be used to optimize the design of aeration system for improving the performance of the bioreactor.

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Bubble dynamic behaviours at various capillary orifices in a bioreactor with methane oxidizing bacteria suspension

Cited by 4 publications

References 26 publications

Experimental investigation on dynamic behaviour of bubbles emerging from micro‐capillary orifice in a flow channel

Experimental investigation on dynamic behaviour of bubbles emerging from micro‐capillary orifice in a flow channel

Experimental investigation of coalescence behaviour of bubble pairs forming at capillary orifices submerged in bacterial suspension

Experimental investigation on bubble dynamic behavior in a confined space bioreactor with bacterial suspension

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