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Article ; Online: A microscale system for

Tong, C Y / Li, Huai Z / Derek, C J C

2023 Volume 23, Issue 18, Page(s) 4052–4066

Abstract: In attached microalgae cultivation systems, cell detachment due to fluid hydrodynamic flow is not a subject matter that is commonly looked into. However, this phenomenon is of great relevance to optimizing the operating parameters of algae cultivation ... ...

Abstract	In attached microalgae cultivation systems, cell detachment due to fluid hydrodynamic flow is not a subject matter that is commonly looked into. However, this phenomenon is of great relevance to optimizing the operating parameters of algae cultivation and feasible reactor design. Hence, this current work miniaturizes traditional benchtop assays into a microfluidic platform to study the cell detachment of green microalgae,
MeSH term(s)	Microalgae ; Chlorella vulgaris ; Hydrodynamics ; Biological Assay ; Cells, Immobilized
Language	English
Publishing date	2023-09-13
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2056646-3
ISSN	1473-0189 ; 1473-0197
ISSN (online)	1473-0189
ISSN	1473-0197
DOI	10.1039/d3lc00415e
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Motion dynamics of liquid drops and powder-encapsulated liquid marbles on an inclined solid surface

Jiang, Xiaofeng / Chen, Shixing / Xu, Enle / Meng, Xianliang / Wu, Guoguang / Li, Huai Z.

Powder technology. 2021 Dec., v. 394

2021

Abstract: Nowadays, superhydrophobicity has been the limelight of the academic community owing to the plethora of applications. In this work, the downhill motion of liquid drops and liquid marbles was investigated by two distinct particle-laden interfaces. Liquid ... ...

Abstract	Nowadays, superhydrophobicity has been the limelight of the academic community owing to the plethora of applications. In this work, the downhill motion of liquid drops and liquid marbles was investigated by two distinct particle-laden interfaces. Liquid drops and liquid marbles accelerate firstly and then move on the slope with a steady velocity which decreases with the liquid viscosity. The steady velocity of liquid marbles is lower than that of liquid drops while the maximum aspect ratio of liquid marbles is higher than that of liquid drops, due to different interface interactions. The particles on the solid substrate enhance the motion of liquid drops while those on the liquid surface reduce the surface tension of liquid marbles. Both liquid drops on non-stick solid surface and non-stick liquid marbles on solid substrate could provide theoretical basis for the precisely targeted transportation of small quantities of liquids by particle-laden interfaces, especially in chemical and biomedical applications.
Keywords	hydrophobicity ; liquids ; surface tension ; transportation ; viscosity
Language	English
Dates of publication	2021-12
Size	p. 1240-1247.
Publishing place	Elsevier B.V.
Document type	Article
ISSN	0032-5910
DOI	10.1016/j.powtec.2021.09.004
Database	NAL-Catalogue (AGRICOLA)

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Article: Mineral pollutants removal through immobilized microalgae-bacterial flocs in a multitrophic microreactor

Beji, Olfa / Adouani, Nouceiba / Poncin, Souhila / Hamdi, Moktar / Li, Huai Z

Environmental technology. 2020 July 2, v. 41, no. 15

2020

Abstract: Microalgae-bacterial flocs (MaB-flocs) immobilization technique using polyvinyl alcohol (PVA) crosslinked with sodium alginate represent a novel approach for sustainable pollutants removal. The present work was performed to evaluate the performance of a ... ...

Abstract	Microalgae-bacterial flocs (MaB-flocs) immobilization technique using polyvinyl alcohol (PVA) crosslinked with sodium alginate represent a novel approach for sustainable pollutants removal. The present work was performed to evaluate the performance of a multitrophic batch reactor at microscale for treating two synthetic wastewater solutions prepared with two different initial Chemical Oxygen Demand (COD): 200 mg.L⁻¹ and 450 mg.L⁻¹, respectively. Three MaB-flocs concentrations were entrapped into PVA-alginate beads: C₁ (2%, v/v), C₂ (5%, v/v) and C₃ (10%, v/v), without O₂ supply, during three periods 2, 4 and 6 days of batch incubation. PVA-alginate beads containing the highest concentration C₃ of MaB-flocs improved the performance of the microreactor to remove significantly NH₄⁺ and PO₄³⁻ of about 61% and 82%, respectively, from wastewater more than two other concentrations used. This result confirms that C₃ of MaB-flocs displays not only a good potential for nutrients removals but also the highest MaB-flocs morphological progression after 6 days of treatment with the highest COD of 450 mg.L⁻¹. The feasibility of the PVA-alginate for cells immobilization, investigated through microscopy analysis, reveals that the evolution of multicellularity in MaB-flocs, for all experiments.
Keywords	batch systems ; chemical oxygen demand ; crosslinking ; environmental technology ; microscopy ; polyvinyl alcohol ; sodium alginate ; wastewater
Language	English
Dates of publication	2020-0702
Size	p. 1912-1922.
Publishing place	Taylor & Francis
Document type	Article
Note	NAL-AP-2-clean
ISSN	1479-487X
DOI	10.1080/09593330.2018.1551939
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Article: Investigation of hydrodynamics in high solid anaerobic digestion by particle image velocimetry and computational fluid dynamics: Role of mixing on flow field and dead zone reduction

Hu, Yuying / Zheng, Xiaohuan / Zhang, Shihao / Ye, Wenjie / Wu, Jing / Poncin, Souhila / Li, Huai Z

Bioresource technology. 2021 Jan., v. 319

2021

Abstract: High solid anaerobic digestion (HSAD) was a potential organic waste treatment. Compared with low solid anaerobic digestion, it had the advantages of small footprint, less digestate, and low heating energy. However, HSAD’s methane production is poor, ... ...

Abstract	High solid anaerobic digestion (HSAD) was a potential organic waste treatment. Compared with low solid anaerobic digestion, it had the advantages of small footprint, less digestate, and low heating energy. However, HSAD’s methane production is poor, mainly due to the complex hydrodynamics. In this study, computational fluid dynamics were utilized for HSAD’s hydrodynamics investigation at 14.3% solid content and compared to the particle image velocimetry measurement. Then, effects of mixing on hydrodynamics were investigated. The results indicated that the diameter of impeller was critical for the radial mixing, and the distance between the impellers dictated the axial mixing. Besides, rotating speed affected flow velocities significantly, but displayed less effect on expanding the mixing range. Furthermore, HSAD’s treating capacity could be increased at large extent by optimizing mixing. The visualization of the hydrodynamics in this study could potentially offer conceptual basis for HSAD’s design in practical engineering.
Keywords	anaerobic digestion ; energy ; hydrodynamics ; impellers ; methane production ; organic wastes ; particle image velocimetry ; waste treatment
Language	English
Dates of publication	2021-01
Publishing place	Elsevier Ltd
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	1065195-0
ISSN	1873-2976 ; 0960-8524
ISSN (online)	1873-2976
ISSN	0960-8524
DOI	10.1016/j.biortech.2020.124130
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Self-similar pinch-off mechanism and scaling of ferrofluid drops.

Jiang, Xiao F / Li, Huai Z

Physical review. E, Statistical, nonlinear, and soft matter physics

2015 Volume 92, Issue 6, Page(s) 61003

Abstract: The pinch off of heterogeneous ferrofluid drops at a nozzle in air was experimentally investigated with a magnetic field (downward or upward) and without a magnetic field. Compared to homogeneous drops, the self-similarity and universal scaling law were ... ...

Abstract	The pinch off of heterogeneous ferrofluid drops at a nozzle in air was experimentally investigated with a magnetic field (downward or upward) and without a magnetic field. Compared to homogeneous drops, the self-similarity and universal scaling law were verified through modifying the initial conditions, such as the nozzle diameter, flow rate, and magnitude and direction of the magnetic fields. Two pinch-off points were observed, and the two consecutive pinch-off dynamics were characterized through scaling laws. Here our scaling exponent remains within the scope of (0.70-0.80) for the primary whereas it remains within the scope of (0.60-0.70) for the secondary pinch off, respectively, comparable to the classic range from 2/3 to 1 for homogeneous drops. The gravity-compensating and gravity-superimposing magnetic fields display a negligible effect on the exponent but determine the sequence of double pinch offs. The universal character of the self-similar pinch off is extended to a heterogeneous fluid.
Language	English
Publishing date	2015-12
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	1550-2376
ISSN (online)	1550-2376
DOI	10.1103/PhysRevE.92.061003
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Quantitative hydrodynamic characterization of high solid anaerobic digestion: Correlation of “mixing-fluidity-energy” and scale-up effect

Hu, Fengping / Zhang, Shihao / Wang, Xin / Wang, Chuqiao / Wu, Jing / Poncin, Souhila / Xu, Li / Xu, Gaoping / Hu, Yuying / Li, Huai Z.

Bioresource technology. 2022 Jan., v. 344

2022

Abstract: High solid anaerobic digestion (HSAD)’s complex rheological behavior exhibits short-circuiting and dead zone. Mixing optimization is potential to enhance HSAD hydrodynamics. Besides, scale-up effect is quite essential for HSAD’s applications, but remains ...

Abstract	High solid anaerobic digestion (HSAD)’s complex rheological behavior exhibits short-circuiting and dead zone. Mixing optimization is potential to enhance HSAD hydrodynamics. Besides, scale-up effect is quite essential for HSAD’s applications, but remains rarely studied yet. Effect of impeller with different width on the correlation of “mixing-fluidity-energy” at different rotating speeds was first investigated at pilot-scale in present work. Then, scale-up effect based on rotating speed and a generalized Reynolds number was revealed from the aspects of fluidity and energy consumption. Results show that impeller width of 100 mm (10 rpm), 200 mm and 300 mm (5 and 10 rpm) are preferred for hydrodynamics and energy economics. Furthermore, Re similarity has better referential significance for the scale-up. In this study, new insight is gained into the correlation of “mixing-fluidity-energy” within a pilot-scale digester. Scale-up effect based Re similarity could potentially offer guidance for HSAD’s application in the practical engineering.
Keywords	Reynolds number ; anaerobic digestion ; economics ; energy ; hydrodynamics ; impellers ; rheological properties
Language	English
Dates of publication	2022-01
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	1065195-0
ISSN	1873-2976 ; 0960-8524
ISSN (online)	1873-2976
ISSN	0960-8524
DOI	10.1016/j.biortech.2021.126237
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Self-Sustained Coalescence-Breakup Cycles of Ferrodrops under a Magnetic Field.

Zhang, Qindan / Wu, Yining / Ma, Youguang / Li, Huai Z

Langmuir : the ACS journal of surfaces and colloids

2019 Volume 35, Issue 37, Page(s) 12028–12034

Abstract: The self-sustained coalescence-breakup cycles of ferrodrops were investigated for the first time by a high-speed camera under various magnetic fields. Under an axial magnetic field, the upper ferrodrop would deform into a conic shape before coalescing ... ...

Abstract	The self-sustained coalescence-breakup cycles of ferrodrops were investigated for the first time by a high-speed camera under various magnetic fields. Under an axial magnetic field, the upper ferrodrop would deform into a conic shape before coalescing with the bottom ferropeak. Within 0.2 ms after coalescence, the minimum width of the expanding neck obeys a power-law relationship with time, while the exponents increase with the magnetic field and deviate with a decreasing trend in the later coalescence. The cone angle of the upper ferrodrop before coalescence gradually decreases while it increases before breakup with the magnetic field. A critical magnetic field around 35 mT was reported, above which the ferrofluid column undergoes the periodic phenomenon of coalescence and breakup. The frequency for the whole coalescence-breakup cycle increases exponentially with the applied magnetic field. A simplified force balance allows capturing the periodic mechanism involved in this driven harmonic oscillator.
Language	English
Publishing date	2019-09-04
Publishing country	United States
Document type	Journal Article
ZDB-ID	2005937-1
ISSN	1520-5827 ; 0743-7463
ISSN (online)	1520-5827
ISSN	0743-7463
DOI	10.1021/acs.langmuir.9b02046
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Article: Self-Sustained Coalescence–Breakup Cycles of Ferrodrops under a Magnetic Field

Zhang, Qindan / Li, Huai Z / Ma, Youguang / Wu, Yining

Langmuir. 2019 Aug. 21, v. 35, no. 37

2019

Abstract: The self-sustained coalescence–breakup cycles of ferrodrops were investigated for the first time by a high-speed camera under various magnetic fields. Under an axial magnetic field, the upper ferrodrop would deform into a conic shape before coalescing ... ...

Abstract	The self-sustained coalescence–breakup cycles of ferrodrops were investigated for the first time by a high-speed camera under various magnetic fields. Under an axial magnetic field, the upper ferrodrop would deform into a conic shape before coalescing with the bottom ferropeak. Within 0.2 ms after coalescence, the minimum width of the expanding neck obeys a power-law relationship with time, while the exponents increase with the magnetic field and deviate with a decreasing trend in the later coalescence. The cone angle of the upper ferrodrop before coalescence gradually decreases while it increases before breakup with the magnetic field. A critical magnetic field around 35 mT was reported, above which the ferrofluid column undergoes the periodic phenomenon of coalescence and breakup. The frequency for the whole coalescence–breakup cycle increases exponentially with the applied magnetic field. A simplified force balance allows capturing the periodic mechanism involved in this driven harmonic oscillator.
Keywords	cameras ; magnetic fields ; physical phenomena
Language	English
Dates of publication	2019-0821
Size	p. 12028-12034.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	2005937-1
ISSN	1520-5827 ; 0743-7463
ISSN (online)	1520-5827
ISSN	0743-7463
DOI	10.1021/acs.langmuir.9b02046
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Article ; Online: Visualization of mass transfer in mixing processes in high solid anaerobic digestion using Laser Induced Fluorescence (LIF) technique.

Hu, Yuying / Zhang, Shihao / Wang, Xin / Peng, Xiaoming / Hu, Fengping / Wang, Chuqiao / Wu, Jing / Poncin, Souhila / Li, Huai Z

Waste management (New York, N.Y.)

2021 Volume 127, Page(s) 121–129

Abstract: High solid anaerobic digestion (HSAD) is a promising technology for the treatment of organic waste. Mixing process in HSAD is quite difficult with long mixing time, poor homogenization, significant short-circuiting and stagnant zones. However, the mass ... ...

Abstract	High solid anaerobic digestion (HSAD) is a promising technology for the treatment of organic waste. Mixing process in HSAD is quite difficult with long mixing time, poor homogenization, significant short-circuiting and stagnant zones. However, the mass transfer in mixing process in HSAD has not been visualized due to the lack of a proper method. In this study, a novel approach for experimentally quantifying the mass transfer in HSAD's mixing process was proposed in a mixing tank equipped with multistage impellers by means of the Laser Induced Fluorescence (LIF) technique. Flow field was investigated for better illustrating the mass transfer, thus Particle Image Velocimetry (PIV) and Computational Fluid Dynamics (CFD) technique were conducted for flow field measurement. The obtained results revealed that the feedstock tended to accumulate around the impeller in the HSAD system, especially near the 1st stage. The tracer diffused rapidly around the 1st impeller in t = 10 s, but the diffusion around the 2nd impeller was quite tough even after 4 h 08 min 23 s. And prolonging mixing time could not significantly improve the flow pattern along with the mixing. In this study, new insight was thrown into the visualization of the mass transfer in mixing process within a HSAD reactor. The visualization of mass transfer in the mixing process in HSAD could offer reference information to the study of the mixing process of HSAD even in full-scale.
MeSH term(s)	Anaerobiosis ; Bioreactors ; Hydrodynamics ; Lasers ; Rheology
Language	English
Publishing date	2021-04-29
Publishing country	United States
Document type	Journal Article
ZDB-ID	2001471-5
ISSN	1879-2456 ; 0956-053X
ISSN (online)	1879-2456
ISSN	0956-053X
DOI	10.1016/j.wasman.2021.04.038
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Article: Visualization of mass transfer in mixing processes in high solid anaerobic digestion using Laser Induced Fluorescence (LIF) technique

Hu, Yuying / Zhang, Shihao / Wang, Xin / Peng, Xiaoming / Hu, Fengping / Wang, Chuqiao / Wu, Jing / Poncin, Souhila / Li, Huai Z

Waste management. 2021 May 15, v. 127

2021

Abstract	High solid anaerobic digestion (HSAD) is a promising technology for the treatment of organic waste. Mixing process in HSAD is quite difficult with long mixing time, poor homogenization, significant short-circuiting and stagnant zones. However, the mass transfer in mixing process in HSAD has not been visualized due to the lack of a proper method. In this study, a novel approach for experimentally quantifying the mass transfer in HSAD’s mixing process was proposed in a mixing tank equipped with multistage impellers by means of the Laser Induced Fluorescence (LIF) technique. Flow field was investigated for better illustrating the mass transfer, thus Particle Image Velocimetry (PIV) and Computational Fluid Dynamics (CFD) technique were conducted for flow field measurement. The obtained results revealed that the feedstock tended to accumulate around the impeller in the HSAD system, especially near the 1st stage. The tracer diffused rapidly around the 1st impeller in t = 10 s, but the diffusion around the 2nd impeller was quite tough even after 4 h 08 min 23 s. And prolonging mixing time could not significantly improve the flow pattern along with the mixing. In this study, new insight was thrown into the visualization of the mass transfer in mixing process within a HSAD reactor. The visualization of mass transfer in the mixing process in HSAD could offer reference information to the study of the mixing process of HSAD even in full-scale.
Keywords	anaerobic digestion ; feedstocks ; fluorescence ; homogenization ; impellers ; mass transfer ; organic wastes ; particle image velocimetry ; waste management
Language	English
Dates of publication	2021-0515
Size	p. 121-129.
Publishing place	Elsevier Ltd
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	2001471-5
ISSN	1879-2456 ; 0956-053X
ISSN (online)	1879-2456
ISSN	0956-053X
DOI	10.1016/j.wasman.2021.04.038
Database	NAL-Catalogue (AGRICOLA)

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