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diffusion transfer
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    In this paper,the theory and recent development of multiphase laminar flow in microfluidics,particularly molecular diffusion,transfer and chemical reactions through the laminar flow interface,laminar flow etching for microchannels,and its applications in preparation of nano materials and bioanalysis are investigated and discussed.
    本文概述了层流的基本原理,总结了近10年来在这方面的研究,包括层流界面间的分子扩散、转移现象和化学反应,以及层流刻蚀加工技术及其在制备纳米材料和在生命医学方面的应用。
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  diffusion transfer
The representation of histone mRNAs was quantitated by electrophoretic fractionation of total cellular RNAs, diffusion transfer to nitrocellulose and hybridization with a series of cloned genomic human histone sequences.
      
1.During the physical modeling of the hydrothermal regime of cooling basins, processes of diffusion transfer may play a major role in shaping the temperature distribution.
      
The change in the structure of an infinite cluster of open pores as they are converted to closed pores decreases the concentration barrier of vacancies that prevent diffusion transfer through the boundaries and growth of the crystals.
      
The penetration involves a simple diffusion transfer through the cytoplasmic membrane of the cell, with a half-time of ~ 2 min.
      
The problem of diffusion transfer of oxygen from an individual capillary into the surrounding skin with regard for the inhomogeneity of the blood composition in the vessel (plasma and erythrocytes) has been solved.
      
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Models of FCC coked catalyst particles and coke burning dynamics were analyzed.It was pointed out that to study the coke burning reaction of coked catalyst must take the view point of macrodynamics.Not only intrinsic dynamics of coke burning must be considered,but the diffusion transfer resistance of gas phase in the process of coked catalyst burning considered as well.Coking burning process of greater particle catalyst can be simulated by the particle-pellet model,homogeneous model and shrinking unreacted...

Models of FCC coked catalyst particles and coke burning dynamics were analyzed.It was pointed out that to study the coke burning reaction of coked catalyst must take the view point of macrodynamics.Not only intrinsic dynamics of coke burning must be considered,but the diffusion transfer resistance of gas phase in the process of coked catalyst burning considered as well.Coking burning process of greater particle catalyst can be simulated by the particle-pellet model,homogeneous model and shrinking unreacted core model.These models have much greater errors to pellet zeolite catalyst.Considering the characteristics of zeolite catalyst,a modified pellet-particle model was put forward and its physical structure,coke distribution and coke burning steps discussed in detail,supplying a basis for establishment and deduction of mathematical equation of the model.

对催化裂化结焦催化剂颗粒模型和结炭燃烧动力学进行了系统的分析和研究 ,指出研究结焦催化剂的烧焦反应过程必须采用宏观动力学的观点 ,既要考虑结炭燃烧的本征动力学 ,又要考虑结焦催化剂烧焦过程中气相组分的扩散传递阻力 ;并指出大多数催化剂颗粒模型如粒子 颗粒模型、均匀模型、未反应核收缩模型等对大颗粒催化剂的烧焦再生过程能够较好地进行模拟 ,但对粒径微小的沸石催化剂烧焦再生的模拟误差很大。根据沸石催化剂的特点 ,提出了修正的颗粒 粒子动态等温物理模型 ,并对该模型的物理结构、焦炭分布以及焦炭燃烧的步骤进行了详细的描述 ,同时也为该模型的数学方程的建立和推导提供了依据。

The knowledge of diffusion is crucial in many processes because reactions and separations are often limited by a diffusional process.Different approaches to describing diffusion transfer are presented, and the existing models for estimation of the diffusion coefficients in non-electrolytic solutions are discussed in this paper.The most widely applied models are combinations of interpolation schemes, with the diffusion coefficients at infinite dilution.The phenomenological approach is capable...

The knowledge of diffusion is crucial in many processes because reactions and separations are often limited by a diffusional process.Different approaches to describing diffusion transfer are presented, and the existing models for estimation of the diffusion coefficients in non-electrolytic solutions are discussed in this paper.The most widely applied models are combinations of interpolation schemes, with the diffusion coefficients at infinite dilution.The phenomenological approach is capable of modeling variations of diffusion coefficients with molar fraction.Another series of models for the estimation of diffusion coefficients are based on the concepts of free volume and activation energy.However, all the variations of this approach operate in term of self-diffusion coefficients, and the self-diffusion coefficients may be related to mutual diffusivities by mixing rules.The approach of molecular dynamics simulation is developing, and widely used for the estimation of self-diffusion, but the strong influence of fluctuations makes it difficult to estimate the mutual diffusion coefficients with good accuracy in a reasonable time.Finally, the evaluation of diffusion coefficients for multi-component mixtures is also presented,and the future research in this area is proposed.

许多过程都涉及扩散控制的传质,相应的扩散速率计算对过程工程的精确量化具有重要意义.本文简述了扩散速率的理论表述模型,并着重介绍了非电解质溶液内扩散系数的理论分析计算途径.分子动力学模拟正处于发展中,并用于估算自扩散系数,但进入实用化阶段尚需时日,唯象模型仍为最重要的理论计算手段.作为最常用的方法,由无限稀释浓度下的扩散系数以及合适的插值方法可计算特定浓度下的扩散系数;自由体积理论是半经验性模型,可以计算自扩散系数,并借助混合规则计算相互扩散系数;最后,对扩散系数的理论研究作了展望.

 
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