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Review:Resuspension of wall deposits in spray dryers

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第11期8卷 1762-1774页

作者： HANUS M.J. langrish t.a.g. School of Chemical and Biomolecular Engineering University of Sydney Sydney NSW 2006 Australia

Wall deposition occurs in spray dryers when dried or partially dried particles contact and adhere to the walls during operation, thus reducing the yield of product collected. Wall deposits also present a product contamination risk and a fire or explosion risk when spray drying products that oxidize exothermically, such as milk powder. Re-entrainment is the resuspension of spray dryer wall deposits into the main gas stream for collection as product. Literature suggests that the process for re-entrainment of particles from spray dryer wall deposits is strongly dependent on particle size and gas velocity.

关键词： Wall deposition Spray dryers Dried particles Re-entrainment Adhesive forces

Heterogeneous particle structure formation during post-crystallization of spray-dried powder

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Particuology 2016年第4期14卷 72-79页

作者： Nima Yazdanpanah tim A.g. langrish School of Chemical & Biomolecular Engineering The University of Sydney Sydney 2006. NSW. Australia

the formation of heterogeneous particle structure in skim milk powder has been investigated in a post- crystallization facility using experimental and a mathematical model. Various processing conditions were used to produce these heterogeneous structures. the experimental process parameters were used as initial and boundary conditions for the model. the modelled data agreed well with the experimental data. the experimental and modelling results show that the powder processed at high water activity （aw = 0.7） with low initial moisture content （X0 = 0.01 kg/kg） developed a crystalline surface layer while the core of the particle remained amorphous. this structure is referred to as an egg-shell structure. the powder that was processed at low water activity （αw = 0.1） with high initial moisture content （X0 = 0.2 kg/kg） developed a crystalline core while the surface of the particle remained amorphous. this structure is referred to as an egg-yolk structure. Understanding the dependency of particle microstructures on the processing conditions could be useful when developing procedures to control the drying equipment because the particle microstructure affects the physicochemical properties of the powder and potential applications and behaviour of the powder.

关键词： Heterogeneous structure Microstructure modification Post-crystallization Phase change Complex domain matrix

An Experimental Investigation of Agglomeration with One and two Nozzle Atomisation

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Chinese Journal of Chemical Engineering 2004年第6期12卷 750-755页

作者： Justin Nijdam Maritza Valencia-Bejarano timothy langrish Chemical Engineering Department University of Sydney AustraliaChemical Engineering Department University of Sydney AustraliaChemical Engineering Department University of Sydney Australia

Water-droplet size and velocity measurements were taken throughout two different sprays produced by a single nozzle and two nozzles pointed towards each other. the aim of this investigation was to understand the manner in which the motion of the droplets in a spray leads to agglomeration of these droplets. It appears that the inertia of the droplets plays an important role in the redistribution of droplets throughout a spray. Larger droplets tend to concentrate at the outer portions of the spray, because they are able to maintain their radial momentum farther downstream of a nozzle, while the smaller droplets follow the airflow more closely and thus collect in the core of the spray. Agglomeration can result from both turbulent collisions and collisions due to the relative velocities of the droplets. the difference between the agglomeration rates in the sprays from a single nozzle and two-nozzles pointed towards each other was difficult to resolve in these experiments, although the results suggest that the outer portions of both sprays should be investigated more closely for evidence of agglomeration.

关键词： spray phase-doppler droplets agglomeration coalescence

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英国羊毛产品及其销售

中国纺织 2005年第3期 151-151页

作者： Frank langrish

英国的绵羊种类比世界上其他任何国家都多,羊毛品种也非常丰富,因此有理由认为,英国羊毛品种是世界上最丰富的.英国有60多种本地产羊种,包括杂交种羊和半交种羊.英国提供的羊毛数量取决于羊肉的产量,而不由英国羊毛销售局来决定.在饲养... 详细信息

英国的绵羊种类比世界上其他任何国家都多,羊毛品种也非常丰富,因此有理由认为,英国羊毛品种是世界上最丰富的.英国有60多种本地产羊种,包括杂交种羊和半交种羊.英国提供的羊毛数量取决于羊肉的产量,而不由英国羊毛销售局来决定.在饲养何种羊,生产什么种类羊毛的问题上,羊毛销售局没有影响力.

关键词：英国销售羊毛产品种羊影响力世界羊种丰富品种羊肉

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受控的空气污染物暴露与心律失常风险

环境与职业医学 2014年第10期31卷 787-787页

作者： Jeremy P.langrish Simon J.Watts Amanda J.Hunter Anoop S.V.Shah Jenny A.Bosson Jon Unosson Stefan Barath Magnus Lundbck Flemming R.Cassee Ken Donaldson thomas Sandstrm Anders Blomberg David E.Newby Nicholas L.Mills

[背景]流行病学研究报道了空气污染暴露与心血管疾病发病率和死亡率增加之间的关联。空气污染物暴露可以影响心脏自主神经节律并降低心率变异性,可能增加心律失常的风险,特别是在敏感的患者群体中。[目的]研究在可控制的空气污染物暴露... 详细信息

[背景]流行病学研究报道了空气污染暴露与心血管疾病发病率和死亡率增加之间的关联。空气污染物暴露可以影响心脏自主神经节律并降低心率变异性,可能增加心律失常的风险,特别是在敏感的患者群体中。[目的]研究在可控制的空气污染物暴露期间和之后,统计分析了健康志愿者和冠状动脉心脏疾病患者的心律失常发生率。[方法]分析数据来自13个随机双盲交叉研究,包括282名参加者(140名健康志愿者和142例稳定性冠状动脉心脏疾病患者)的连续心电图记录。记录研究人群每次暴露时发生心律失常的情况。[结果]在稀释的柴油车尾气、木材烟雾、臭氧、浓缩的环境颗粒物、工程碳纳米颗粒或空气污染高环境水平的暴露期间或者之后,无论在健康志愿者或冠状动脉心脏疾病患者中,任何形式心律失常的发生均没有增加。[结论]急性、可控制的空气污染物暴露不增加受试者发生心律失常的短期风险。研究中所采用的这些技术,对于确定涉及空气污染不利影响的重要病理生理途径依然至关重要,并且在为环境和公共卫生政策决策提供信息中也起着重要的作用。

关键词：空气污染物心律失常短期风险健康志愿者患者群体摘要心脏自主神经心脏疾病