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Local solids flow structure in a countercurrent liquid-upward and solids-downward fluidized bed(CCLSFB)system

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Particuology 2023年第5期76卷 13-22页

作者： Enming Zhang Keying Ma Yuanyuan Shao jesse Zhu School of Chemical Engineering and Technology Tianjin UniversityTianjin300072China Department of Chemical&Biochemical Engineering Western UniversityLondonOntarioN6A 3K7Canada Institute of Shaoxing Tianjin UniversityZhejiang312300China

The local solids holdup and local particle velocity in a Countercurrent Liquid-upward and Solids-downward Fluidized Bed(CCLSFB)were investigated in details using optical fiber probes with two different models in a Plexiglas column of 1.5 m in height and 7.0 cm in inner diameter.A new flow regime map including fluidized bed,transition,and flooding regimes was *** axial solids holdup distribution is almost uniform at low liquid velocity and/or solids flowrate and becomes less uniform with higher solids holdup at the top of the column after the operating liquid velocity is reaching the flooding *** radial solids holdup profile is also nearly flat with a slightly lower solids holdup in the near-wall region at low liquid velocity and solids flowrate but becomes nonuniform as the operating liquid velocity approaches the flooding *** equations were also proposed to correlate radial local solids *** descending particle velocity in CCLSFB increases with the decrease of the liquid velocity and the increase of the solids flowrate.A generally uniform particle velocity distribution was found in the axial direction,as well as in the radial direction except for a small decrease near the *** results on the local solids flow structure would provide basic information and theoretical supports for the design and industrial application of CCLSFB.

关键词： Countercurrent liquid-solid fluidized bed Flow regime Optical fiber probe Solids holdup Particle velocity

A microfluidic approach for development of hybrid collagen-chitosan extracellular matrix-like membranes for on-chip cell cultures

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Journal of Materials Science & Technology 2021年第4期63卷 54-61页

作者： Erica Rosella Nan Jia Diego Mantovani jesse Greener Laboratory Department of ChemistryLaval UniversityQuébecQCCanada Laboratory of Biomaterials and Bioengineering CRC-1Dept.Min-Met-Materials Eng&CHU de QuebecResearch CenterLaval UniversityQuébecQCCanada CHU de Quebec Research Centre Laval University10 rue de l’EspinayQuébecQC G1L 3L5Canada

To advance organ-on-a-chip development and other areas befitting from physiologically-relevant biomembranes,a microfluidic platform is presented for synthesis of biomembranes during gelation and investigation into their role as extracellular matrix *** this work,high-throughput studies of collagen,chitosan,and collagen-chitosan hybrid biomembranes were carried out to characterize and compare key properties as a function of the applied hydrodynamic conditions during ***,depending on the biopolymer material used,varying flow conditions during biomembrane gelation caused width,uniformity,and swelling ratio to be differently affected and ***,cell viability studies of seeded fibroblasts were conducted,thus showing the potential for biological applications.

关键词： matrix swelling showing

Hydrodynamics of a bubble-induced inverse fluidized bed reactor with a nanobubble tray

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Particuology 2023年第2期73卷 8-16页

作者： Yicheng Deng Keying Ma Yuanyuan Shao jesse Zhu School of Chemical Engineering and Technology Tianjin UniversityTianjin300072China Department of Chemical and Biochemical Engineering The University of Western OntarioLondonOntarioN6A 3K7Canada Institute of Shaoxing Tianjin UniversityZhejiang312300China

This paper reports on the hydrodynamics of a bubble-induced inverse fluidized bed reactor,using a nanobubble tray gas distributor,where solid particles are fluidized only by an upward gas *** the gas velocity,the fixed layer of particles initially packed at the top of the liquid starts to move downwards,due to the rise of bubbles in this system,and then gradually expands downwards until fully *** axial local pressure drops and standard deviation were examined to delineate the flow regime comprehensively under different superficial gas *** flow regimes(fixed bed regime,initial fluidization regime,expanded regime,and post-homogeneous regime)were observed and three transitional gas velocities(the initial fluidization velocity,minimum fluidization velocity,and homogeneous fluidization velocity)were identified to demarcate the flow *** correlations were developed for the three transitional *** the fine bubbles generated from the nanobubble tray gas distributor are well distributed in the entire column,the bed expansion process of the particles is relatively steady.

关键词： Bubble-induced Inverse fluidized bed Pressure drop Flow regime Bed expansion ratio Standard deviation

Nitrogen distribution in the products from the hydrothermal liquefaction of Chlorella sp. and Spirulina sp.

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Frontiers of Chemical Science and Engineering 2022年第6期16卷 985-995页

作者： Tianyi Bao Yuanyuan Shao Haiping Zhang jesse Zhu School of Chemical Engineering of Technology Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Membrane Science and Desalination Technology Tianjin 300072China Department of Chemical&Biochemical Engineering The University of Western OntarioOntario N6A 3K7Canada

The high contents of nitrogen-containing organic compounds in biocrude obtained from hydrothermal liquefaction of microalgae are one of the most concerned issues on the applications and *** the project,Chlorella *** Spirulina *** selected as raw materials to investigate the influence of different reaction conditions(i.e.,reaction temperature,residence time,solid loading rate)on the distribution of nitrogen in the oil phase and aqueous *** main forms of nitrogen-containing organic compounds including nitrogen-heterocyclic compounds,amide,and amine were detected in *** contents of nitrogen-heterocyclic compounds decreased with temperature while amide kept *** effect of residence time on the components of nitrogen-containing organic compounds was similar with that of ***,the influence of solid loading rate was ***,it was also found that the differences of amino acids in the protein components in the two microalgae might affect the nitrogen distribution in *** example,nitrogen in basic amino acids of Spirulina *** to go into the aqueous phase comparing with the nitrogen in neutral amino acids of Chlorella *** summary,a brief reaction map was proposed to describe the nitrogen pathway during microalgae hydrothermal liquefaction.

关键词： microalgae hydrothermal liquefaction biocrude nitrogen distribution

安第斯山脉迷雾世界最长山脉是否为外星人着陆点？

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环球人文地理 2024年第5期 16-27页

作者：徐徐周巨成郭卓然 Mark.C 胡子捷森 Jair Goran Maria jesse 徐霄宇摄图网

这里有瑰丽险峻的火山、神奇壮阔的瀑布、神秘莫测的纳斯卡线条、扑朔迷离的外星人木乃伊，这里的动物们每天都经历着世界上最艰辛的生存之战……横跨七国的美洲“巨人”地理学家的参考坐标安第斯山脉是地球上最长的陆地山脉，从南到北...

这里有瑰丽险峻的火山、神奇壮阔的瀑布、神秘莫测的纳斯卡线条、扑朔迷离的外星人木乃伊，这里的动物们每天都经历着世界上最艰辛的生存之战……横跨七国的美洲“巨人”地理学家的参考坐标安第斯山脉是地球上最长的陆地山脉，从南到北贯穿整个南美大陆，纵跨67个纬度带，被称作“南美洲的脊梁”。它全长约8900千米，属于科迪勒拉山系，穿越包括委内瑞拉、哥伦比亚、厄瓜多尔、秘鲁、玻利维亚、智利和阿根廷在内的七个国家。

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A modified wake model in bubble-induced three-phase inverse fluidized bed(BIFB)

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Particuology 2022年第6期20卷 133-138页

作者： Keying Ma Xiliang Sun Yuanyuan Shao jesse Zhu Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) School of Chemical Engineering of TechnologyTianjin UniversityTianjin 300072China Department of Chemical&Biochemical Engineering The University of Western OntarioLondonOntarioN6A 3K7Canada

A modified wake model was proposed for the newly developed bubble-induced three-phase inverse fluidized bed(BIFB),by combining the generalized wake model and the gas-perturbed liquid *** the basis of the modified wake model,the solids and liquid holdups and the complete fluidization gas velocity in BIFB system have been successfully predicted with two established *** predictions achieved very good agreements with the experimental data.

关键词： Generalized wake model Solids holdup Liquid holdup Complete fluidization gas velocity

Developments in the understanding of gas–solid contact efficiency in the circulating fluidized bed riser reactor:A review

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Chinese Journal of Chemical Engineering 2016年第1期24卷 53-62页

作者： Chengxiu Wang jesse Zhu State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing Department of Chemical & Biochemical Engineering The University of Western Ontario

In the last several decades, circulating fluidized bed reactors have been studied in many aspects including hydrodynamics, heat and mass transfer and gas–solid two phase contacting. However, despite the abundance of review papers on hydrodynamics, there is no summary paper on gas–solid contact efficiency to date, especially on high density circulating fluidized beds(CFBs). This paper gives an introduction to, and a review of the measurement of contact efficiency in circulating fluidized bed riser. Firstly, the popular testing method of contact efficiency including the method of heating transfer experiment and hot model reaction are discussed, then previous published papers are reviewed based on the discussed methods. Some key results of the experimental work are described and discussed. Gas–solid contact efficiency is affected by the operating conditions as well as the particle size distribution. The result of the contact efficiency shows that the CFB riser is far away from an ideal plug flow reactor due to the characteristics of hydrodynamics in the riser. Lacunae in the available literature have been delineated and recommendations have been made for further work.

关键词： Circulating fluidized bed Riser High density Gas–solid contacting Heat transfer Ozone decomposition

Innovative manufacturing technology enabling light weighting with steel in commercial vehicles

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Advances in Manufacturing 2015年第1期3卷 3-18页

作者： Hardy Mohrbacher Marius Spottl jesse Paegle NiobelCon bvba SchildeBelgium WISCO Lasertechnik GmbH RavensburgGermany Gestamp Sao PauloBrazil

Improved manufacturing technology is often needed when working with high strength steel. In this re- spect manufacturing technology has to adapt to the altered （and typically reduced） formability and weldability of modern high strength steel. However, this is a rather passive approach from a manufacturing point of view. An indeed much more powerful approach is to generate synergies between innovative manufacturing technology, design and material enabling additional weight savings and efficiency gains. Laser-based material processing, in particular laser welding, offers a wide range of opportunities in this sense. Furthermore, hot stamping and roll forming open up new possibilities for advanced manufacturing of commercial vehicle components. Applications and examples of these technologies will be given in terms of producing innovative semi-products as well as final components.

关键词： Commercial vehicles . Light weightingstrength steel . Roll forming - Press forming - Hotstamping . Tailor-welded blanks .Tailor-welded coils

Male infertility： lifestyle factors and holistic, complementary, and alternative therapies

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Asian Journal of Andrology 2016年第3期18卷 410-418,I0008,I0009页

作者： David F Yao jesse N Mills Department of Urology UCLA 1260 15^th St #1200 Santa Monica CA 90404 USA.

While we may be comfortable with an allopathic approach to male infertility, we are also responsible for knowledge about lifestyle modifications and holistic, complementary, and alternative therapies that are used by many of our patients. This paper provides an evidence-based review separating fact from fiction for several of these therapies. There is sufficient literature to support weight reduction by diet and exercise, smoking cessation, and alcohol moderation. Supplements that have demonstrated positive effects on male fertility on small randomized controlled trial （RCT） include aescin, coenzyme Qlo, glutathione, Korean red ginseng, L-carnitine, nigella sativa, omega-3, selenium, a combination of zinc and folate, and the Menevit antioxidant. There is no support for the use of Vitamin C, Vitamin E, or saffron. The data for Chinese herbal medications, acupuncture, mind-body practice, scrotal cooling, and faith-based healing are sparse or inconclusive.

关键词： alcohol antioxidants caffeine faith-based healing male infertility obesity scrotal cooling sperm tobacco traditional Chinese medicine