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absorption rate into a Small Sphere for a Diffusing Particle Confined in a Large Sphere

Applied Mathematics 2016年第7期7卷 709-720页

作者： Hongyun Wang Hong Zhou Department of Applied Mathematics and Statistics Baskin School of Engineering University of California Santa Cruz CA USA Department of Applied Mathematics Naval Postgraduate School Monterey CA USA

We study the problem of a diffusing particle confined in a large sphere in the n-dimensional space being absorbed into a small sphere at the center. We first non-dimensionalize the problem using the radius of large confining sphere as the spatial scale and the square of the spatial scale divided by the diffusion coefficient as the time scale. The non-dimensional normalized absorption rate is the product of the physical absorption rate and the time scale. We derive asymptotic expansions for the normalized absorption rate using the inverse iteration method. The small parameter in the asymptotic expansions is the ratio of the small sphere radius to the large sphere radius. In particular, we observe that, to the leading order, the normalized absorption rate is proportional to the (n - 2)-th power of the small parameter for .

关键词： Diffusion Equation Brownian Diffusion Asymptotic Solutions absorption rate

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Kinetics study of CO_(2) absorption in potassium carbonate solution promoted by diethylenetriamine

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Green Energy & Environment 2021年第1期6卷 83-90页

作者： Rouzbeh Ramezani Renzo Di Felice Department of Civil Chemical and Environmental EngineeringUniversity of GenoaVia Opera Pia 1516145GenovaItaly

In this work,characterization and kinetics of CO2 absorption in potassium carbonate(K_(2)CO_(3))solution promoted by diethylenetriamine(DETA)were *** measurements were performed using a stirred cell reactor in the temperature range of 303.15–323.15 K and total concentration up to 2.5 kmol m*** density,viscosity,physical solubility,CO_(2) diffusivity and absorption rate of CO_(2) in the solution were *** reaction kinetics between CO_(2) and K2CO3þDETA solution were ***-first order kinetic constants were also predicted by zwitterion *** was revealed that the addition of small amounts of DETA to K_(2)CO_(3) results in a significant enhancement in CO_(2) absorption *** reaction order and activation energy were found to be 1.6 and 35.6 kJ mol1,*** terms of reaction rate constant,DETA showed a better performance compared to the other promoters such as MEA,EAE,proline,arginine,taurine,histidine and alanine.

关键词： Gas absorption CO_(2)capture Reaction rate constant Kinetic study absorption rate

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Experimental Study of the Physical and Mechanical Behaviour of Mortar Formulations with Fine Sands of Recycled Glass

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Open Journal of Civil Engineering 2023年第2期13卷 252-262页

作者： Apedjinou Dodji Kplolanyo Samah Essoavama Ouro-Djobo Amey Kossi Bollanigni Kassegne Komlan Assogba Tiem Sonnou Laboratoire de Structures et de Mécanique des Matériaux école Polytechnique de l’Université de Lomé Lomé Togo Centre Régional de Formation pour l’Entretien Routier (Togo) (CERFER) Lomé Togo Equipe de Recherche et Développement de l’Institut FORMATEC Lomé Togo

This work is part of an experimental contribution approach to the study of the incorporation of glass sand from the grinding of recycled glass waste in cement mortars and its influence on the physical and mechanical behavior of semi-rich mortars without adjuvants. For this purpose, after a physical characterization of the sands, eight (08) formulations of mortars based on cement CEM II B/L 32.5R and fine sands (0/2) of glass at mass contents of 0%, 10%, 20%, 30%, 40%, 50%, 75% and 100% of the silty sand (0/2) were made respectively to three (03) types of fine glass sand (white, brown, green) with water dosages on cement (W/C) of 0.50, 0.45, 0.40. The results obtained show that the fine sands of recycled glass have a higher water absorption than the silty sand and the physical properties of the mortars prepared are affected by the increase in the glass content. The mechanical performances are obtained for the ratio W/C = 0.50 and the formulation of glass mortars for an optimal compressive strength superior to glass-free mortar requires a substitution of 10% for fine white glass sand, 20% for sand fine green glass and 75% for fine brown glass sand. The comparative study between these different compositions of fine glass sand mortars shows that the mechanical performances of fine brown glass sand are better than other glass sands but generally remain inferior to the control mortar based on natural silty sand.

关键词： Glass Waste Glass Sand Mortar Compression Strength Bending Strength absorption rate

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多孔硅酸钙涂覆聚丙烯无纺布的结构分析与性能研究

多孔硅酸钙涂覆聚丙烯无纺布的结构分析与性能研究

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2014年全国高分子材料科学与工程研讨会

作者：唐运容陈建平刘欣武汉纺织大学材料科学与工程学院

多孔硅酸钙是一种具有高孔隙特征的新型矿物填料。目前,我国以固体废弃物高铝粉煤灰为原料常压脱硅后制备出多孔硅酸钙,但其利用不完善,因此对多孔硅酸钙的应用研究显得十分重要。本文研究了不同温度、不同磨粉速率对多孔硅酸钙结构的影... 详细信息

多孔硅酸钙是一种具有高孔隙特征的新型矿物填料。目前,我国以固体废弃物高铝粉煤灰为原料常压脱硅后制备出多孔硅酸钙,但其利用不完善,因此对多孔硅酸钙的应用研究显得十分重要。本文研究了不同温度、不同磨粉速率对多孔硅酸钙结构的影响,并将多孔硅酸钙涂覆在聚丙烯无纺布上制备出了一种高吸附性的新材料,分析了不同浓度多孔硅酸钙涂覆对无纺布透气性和甲醛气体吸附性的影响,最终获得了制备该材料的最佳方案:煅烧温度

关键词： porous calcium silicate PP non-woven fabric absorption rate air permeability

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Enhancement of absorption of Injected Gas in New Type Mechanical Stirring Injection Refine Equipment

Enhancement of Absorption of Injected Gas in New Type Mechan...

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2011 International Conference on Fuzzy Systems and Neural Computing(FSNC 2011)

作者： Zhang TingAn Liu Yan Wang qiang He JiCheng Masamichi Sano School of material and metallurgy Northeastern University Nogoya University

The bubble disintegration is of great scientific importance in metal refining, In order for further improvement, Research on bubble disintegration and dispersion becomes necessary, The intensification of bubble disintegration experiment that we have done in cold water model by study absorption rate,The purpose is to research bubble disintegration under difference experimental condition. In this paper, we use mass transfer coefficients stand for absorption rate, we also study utilization rate, we want to research the best experimental condition which can enhance mass transfer coefficients and utilization rate. On the basis of experimental result, Provided a scientific and experimental basis to high-temperature experiment of bubble dispersion and *** results show:the rate of absorption of CO2 injected in aqueous Na OH solution can be increased greatly by mechanical stirring when the positive-reverse rotation mode is adopted. Dispersion of small bubbles in the liquid is very effective for increasing the absorption rate.

关键词： bubble disintegration and dispersion absorption rate injection refine

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