Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa最新文献_第7页

Numerical simulation of deformation and fragmentation of fractal-like nanoaggregates 分形纳米聚集体变形和破碎的数值模拟

4区工程技术

Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa Pub Date : 2023-11-06 DOI: 10.24425/cpe.2019.130213

Łukasz Żywczyk, Arkadiusz Moskal, Rafał Przekop

{"title":"Numerical simulation of deformation and fragmentation of fractal-like nanoaggregates","authors":"Łukasz Żywczyk, Arkadiusz Moskal, Rafał Przekop","doi":"10.24425/cpe.2019.130213","DOIUrl":"https://doi.org/10.24425/cpe.2019.130213","url":null,"abstract":"A ﬂexible fractal-like aggregate model was used to study deformation and fragmentation of the structure of fractal-like aggregates via their impaction with rigid rough surface. Aggregates were conveyed one at the time towards a surface under vacuum conditions. The number of primary particles remaining in each fragment, ratio of average fragment radius of gyration after impaction to the average fragment initial radius of gyration and ratio of average coordination number to the initial coordination number were monitored for each individual aggregate. Results demonstrate that depending on the impact velocity, the fractal dimension of the aggregate, the strength of bonds between primary particles, the stiﬀness of the aggregate structure and the diameter of primary particle composing an aggregate, restructuring or breakage of the aggregate occur. Moreover, in the analysis of the ratio of coordination number of aggregates after impaction to the initial coordination number, three regimes were distinguished: ﬁrst no deformation at low impact velocities, second restructurisation regime and ﬁnally fragmentation regime where partial or total fragmentation of aggregates was observed.","PeriodicalId":55267,"journal":{"name":"Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa","volume":"145 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135679095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of calcium, magnesium and iron ions on the molecular mass of exoproteins during biogranulation 钙、镁和铁离子对生物造粒过程中外蛋白分子质量的影响

4区工程技术

Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa Pub Date : 2023-11-06 DOI: 10.24425/cpe.2020.136011

{"title":"Influence of calcium, magnesium and iron ions on the molecular mass of exoproteins during biogranulation","authors":"","doi":"10.24425/cpe.2020.136011","DOIUrl":"https://doi.org/10.24425/cpe.2020.136011","url":null,"abstract":"In this study, we performed the qualitative analysis of exoproteins during granule formation in the presence or in the absence of cations. The staining of thin granule cryosections showed that nucleic acids, proteins, polysaccharides and calcium cations were the dominant components of the granules. Proteins are the structural components associated with calcium ions. We determined changes in the proteomic proﬁle and tightly bound extracellular polymeric substances (EPS) of the slime. The exopolymeric matrix containing the proteins was extracted using the Dowex resin method. Proteomic proﬁle was analysed by SDS-PAGE method (sodium dodecyl sulphate polyacrylamide gel electrophoresis) using Coomassie blue staining in the samples of the aerobic granule matrix formed in the presence of multivalent cations and compared with that of the aerobic granules cultivated without cations. The results indicate that the granule matrix is predominantly composed of large and complex proteins that are tightly bound within the granular structure. The tightly bound extracellular polymeric substances (TB-EPS) may play a role in improved mechanical stability of aerobic granules. In the supernatant fraction of the sludge, only a small amount of free proteins in the medium molecular mass range was detected. The protein with high molecular mass ( (cid:21) 116 kDa) produced in the reactors with added Ca 2 + . Ca 2 + had a considerable regulatory inﬂuence on production of extracellular proteins during aerobic granulation.","PeriodicalId":55267,"journal":{"name":"Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa","volume":"205 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135679712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analysis of liquid blending dynamics with Maxblend impellers by Electrical Resistance Tomography 用电阻层析成像技术分析Maxblend叶轮的液体混合动力学

4区工程技术

Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa Pub Date : 2023-11-06 DOI: 10.24425/cpe.2021.138925

引用次数: 0

Selection of batch process conditions for microbiological production of lactic acid using waste whey 废乳清微生物生产乳酸间歇工艺条件的选择

IF 0.6 4区工程技术

Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa Pub Date : 2023-11-06 DOI: 10.24425/CPE.2019.126101

M. Lech, Anna Trusek

引用次数: 0

Large Eddy Simulation of turbulent flowand heat transfer in a Kenics static mixer Kenics静态混合器内湍流流动和传热的大涡模拟

IF 0.6 4区工程技术

Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa Pub Date : 2023-11-06 DOI: 10.24425/CPE.2019.126103

H. Murasiewicz, B. Zakrzewska

{"title":"Large Eddy Simulation of turbulent flowand heat transfer in a Kenics static mixer","authors":"H. Murasiewicz, B. Zakrzewska","doi":"10.24425/CPE.2019.126103","DOIUrl":"https://doi.org/10.24425/CPE.2019.126103","url":null,"abstract":"CFD modelling of momentum and heat transfer using the Large Eddy Simulation (LES) approach has been presented for a Kenics static mixer. The simulations were performed with the commercial code ANSYS Fluent 15 for turbulent flow of three values of Reynolds number, Re = 5 000, 10 000 and 18 000. The numerical modelling began in the RANS model, where standard k−ε turbulence model and wall functions were used. Then the LES iterations started from the initial velocity and temperature fields obtained in RANS. In LES, the Smagorinsky–Lilly model was used for the sub-grid scale fluctuations along with wall functions for prediction of flow and heat transfer in the near-wall region. The performed numerical study in a Kenics static mixer resulted in highly fluctuating fields of both velocity and temperature. Simulation results were presented and analysed in the form of velocity and temperature contours. In addition, the surface-averaged heat transfer coefficient values for the whole insert length were computed and compared with the literature experimental data. Good compliance of the LES simulation results with the experimental correlation was obtained.","PeriodicalId":55267,"journal":{"name":"Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa","volume":"40 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68946953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Study of temperature distribution in the ground 地温分布的研究

IF 0.6 4区工程技术

Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa Pub Date : 2023-11-06 DOI: 10.24425/CPE.2019.126106

Barbara Larwa, K. Kupiec

{"title":"Study of temperature distribution in the ground","authors":"Barbara Larwa, K. Kupiec","doi":"10.24425/CPE.2019.126106","DOIUrl":"https://doi.org/10.24425/CPE.2019.126106","url":null,"abstract":"Knowledge of the temperature distribution in subsurface layers of the ground is important in the design, modelling and exploitation of ground heat exchangers. In this work a mathematical model of heat transfer in the ground is presented. The model is based on the solution of the equation of transient heat transfer in a semi-infinite medium. In the boundary condition on the surface of the ground radiation fluxes (shortand long-wave), convective heat flux and evaporative heat flux are taken into account. Based on the developed model, calculations were carried out to determine the impact of climatic conditions and the physical properties of the ground on the parameters of the Carslaw-Jeager equation. Example results of calculated yearly courses of the daily average temperature of the surface of the ground and the amount of particular heat fluxes on the ground surface are presented. The compatibility of ground temperature measurements at different depths with the results obtained from the Carslaw–Jaeger equation is evaluated. It was found that the temperature distribution in the ground and its variability in time can be calculated with good accuracy.","PeriodicalId":55267,"journal":{"name":"Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68946999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Membrane installation for biogas enrichment – Field tests and system simulation 沼气富集用膜装置——现场试验和系统模拟

IF 0.6 4区工程技术

Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa Pub Date : 2023-11-06 DOI: 10.24425/CPE.2019.126116

A. Chmielewski, A. Urbaniak, J. Palige, O. Roubinek, K. Wawryniuk, A. Dobrowolski

{"title":"Membrane installation for biogas enrichment – Field tests and system simulation","authors":"A. Chmielewski, A. Urbaniak, J. Palige, O. Roubinek, K. Wawryniuk, A. Dobrowolski","doi":"10.24425/CPE.2019.126116","DOIUrl":"https://doi.org/10.24425/CPE.2019.126116","url":null,"abstract":"The paper presents results of the field tests on membrane biogas enrichment performed with the application of mobile membrane installation (MMI) with the feed stream up to 10 Nm3/h. The mobile installation equipped with four hollow fibre modules with polyimide type membranes was tested at four different biogas plants. Two of them were using agricultural substrates. The third one was constructed at a municipal wastewater plant and sludge was fermented in a digester and finally in the fourth case biogas was extracted from municipal waste landfill site. Differences in the concentration of bio-methane in feed in all cases were observed and trace compounds were detected as well. High selectivity polyimide membranes, in proper module arrangements, can provide a product of high methane content in all cases. The content of other trace compounds, such as hydrogen sulphide, water vapour and oxygen on the product did not exceed the values stated by standard for a biogas as a vehicle fuel. The traces of hydrogen sulphide and water vapour penetrated faster to the waste stream enriched in carbon dioxide, which could lead to further purification of the product – methane being hold in the retentate (H2O > H2S > CO2 > O2 > CH4 > N2). In the investigated cases, when concentration of N2 was low and concentration of CH4 higher than 50%, it was possible to upgrade methane to concentration above 90% in a two-stage cascade.","PeriodicalId":55267,"journal":{"name":"Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68947124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Influence of shear direction on gelation ability of colloidal chitosan solutions 剪切方向对壳聚糖胶体溶液凝胶能力的影响

4区工程技术

Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa Pub Date : 2023-11-06 DOI: 10.24425/cpe.2019.126113

引用次数: 2

Emulsions as vehicles for the controlled release of astaxanthin in topical application 乳剂作为外用虾青素控释载体的研究

4区工程技术

Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa Pub Date : 2023-11-06 DOI: 10.24425/cpe.2021.138939

引用次数: 1

Principles of modelling of slinky-coil ground heat exchangers 弹簧盘管式地热交换器的建模原理

4区工程技术

Chemical and Process Engineering-Inzynieria Chemiczna I Procesowa Pub Date : 2023-11-06 DOI: 10.24425/cpe.2019.130225

引用次数: 0