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| 1 | CFD Study of Ejector Flow Behavior in a Blast Furnace Gas Galvanizing Plant显示文摘In recent years, there has been a growing interest toward Blast Furnace Gas(BFG) as a low-grade energy source for industrial furnaces. This paper considers the revamping of a galvanic plant furnace converted to BFG from natural gas. In the design of the new system, the ejector on the exhaust line is a critical component. This paper studies the flow behavior of the ejector using a Computational Fluid Dynamics(CFD) analysis. The CFD model is based on a 3D representation of the ejector, using air and exhaust gases as working fluids. This paper is divided in three parts. In the first part, the galvanic plant used as case study is presented and discussed, in the second part the CFD approach is outlined, and in the third part the CFD approach is validated using experimental data and the numerical results are presented and discussed. Different Reynolds-Averaged Navier–Stokes(RANS) turbulence models(k-ω SST and k-ε Realizable) are evaluated in terms of convergence capability and accuracy in predicting the pressure drop along the ejector. Suggestions for future optimization of the system are also provided. | Giorgio Besagni Riccardo Mereu Fabio Inzoli | 2015 | Journal of Thermal Science2015，24，1： | 4 |
| 2 | On the scale-up criteria for bubble columns显示文摘It is generally admitted that experimental data obtained in“laboratory-scale”bubble columns are representative of“industrial-scale”reactors if the well-known three“Wilkinson et al.scale-up criteria”are satisfied:(a)the diameter of the bubble column is larger than 0.15 m,(b)the sparger openings are larger than 1e2mm and(c)the aspect ratio is larger than 5.The aim of this communication is to contribute to the existing discussion.To this end,this communication collects relevant experimental investigation and include new experimental data:in particular,we have experimentally studied the combined effect of the aspect ratio(within the range of 1e15)and the sparger design(considering both“coarse”and“fine”spargers)on the gas holdup in a large-diameter and large-scale gas-liquid bubble column.The bubble column has been operated both in the batch mode and in the counter-current mode.Filtered air has been used as the gaseous phase in all the experiments,while the liquid phase has included deionized water and different aqueous solutions of organic(i.e.,ethanol)and inorganic(i.e.,sodium chloride,NaCl)active agents.It is found that the“Wilkinson et al.scale-up criteria”are valid for the air-water case in the batch mode for“very-coarse”spargers.Conversely,they are no more valid when considering different liquid velocity,and/or aqueous solutions of active agents,and other sparger openings. | Giorgio Besagni Lorenzo Gallazzini Fabio Inzoli | 2019 | Petroleum2019，5，2： | 2 |
| 3 | Organicresin method for highly reactive and homogeneous hexaferrite powders显示文摘 | Licli F Besagni T | 1984 | IEEE Trans Magn1984，20，5： | 1 |
| 4 | STAY- GREEN and chlorophyll catabolic enzymes interact at light-harvesting complex II for chlorophyll detoxification during Leaf senescence in Arabidopsis显示文摘 | Yasuhito S Silvia S Soyon P Han S H Lee B D C61ine Besagni AndrOs Kessler F Stefan Hirtensteiner Nam Chon Paek | 2012 | The Plant Cell2012，24，： | 1 |
| 5 | A concept for inferring ‘frontier research’ in grant proposals显示文摘 | Marianne H?rlesberger Ivana Roche Dominique Besagni Thomas Scherngell Claire Fran?ois Pascal Cuxac Edgar Schiebel Michel Zitt Dirk Holste | 2013 | Scientometrics2013，，2： | 1 |
| 6 | Problems in the low-temperature synthesis of 92K Superconducting YBCO显示文摘 | F. Licci T. Besagni P. Ferro L. Wang L. Raffo | 1994 | Il Nuovo Cimento D (-)1994，，10： | 1 |
| 7 | Ejector refrigeration: A compre-hensive review显示文摘 | Besagni G Mereu R Inzoli F | 2016 | Renewable and Sustainable Energy Re-views2016，53，： | 1 |
| 8 | What are the odds?On the determinants of high residential energy expenditure显示文摘A precise understanding of the relationships between the household characteristics and the residential energy consumption is needed to support the implementation of effective top-bottom energy strategies and to improve the prediction of forecasting models.This paper contributes to the present-day discussion and analyses the build-ing factors,socio-demographic variables and appliances contributing to high-energy expenditures(viz.,electrical energy expenditure,thermal energy expenditure and total energy expenditure)in the Italian households.The proposed study builds on an earlier work proposed by the authors,which identified the determinants of the household energy expenditures,based on a nationally representative survey(the“household Budget Survey:mi-crodata for research purposes-2015”performed by the Italian National Institute of Statistics).In particular,the present paper completes and extends the previous research by applying the odds-ratio analysis to the previously identified determinants,in order to identify the factors that led to high electricity consumption(viz.,electrical energy expenditure,thermal energy expenditure and total energy expenditure).In conclusion,this paper aims to providing a more precise understanding of the factors that certainly affect the energy expenditure. | Giorgio Besagni Marco Borgarello | 2020 | Energy and Built Environment2020，1，3： | 0 |
| 9 | The effect of operating and design parameter on bubble column performance:The LOPROX case study显示文摘It is known that the performances of multi-phase reactors depend on the operating parameters(the temperature and the pressure of the system),the phase properties,and the design parameters(the aspect ratio(AR),the bubble column diameter,and the gas sparger design).Hence,the precise design and the correct operation of multi-phase reactors depends on the understanding and prediction of the fluid dynamics parameters.This paper contributes to the existing discussion on the effect of operating and design parameter on multi-phase reactors and,in particular,it considers an industrial process(e.g.,the LOPROX(low pressure oxidation)case study,which is typical example of two-phase bubble columns).Based on a previously-validated set of correlations,the influence of operating and design parameter on system performances is studied and critically analyzed.First,we studied the effects of the design parameter on the liquid–gas interfacial area,by keeping constant the fluid physical–chemical properties as well as the operating conditions;subsequently,we discussed for a fixed system design,the influence of the liquid phase properties and the operating pressure.In conclusion,this paper is intended to provide guidelines for the design and scale-up of multi-phase reactors. | Giorgio Besagni | 2021 | Chinese Journal of Chemical Engineering2021，34，12： | 0 |
| 10 | The pseudo-homogeneous flow regime in large-scale bubble columns:experimental benchmark and computational fluid dynamics modeling显示文摘A precise prediction of the fluid dynamics in bubble columns is of fundamental importance to correctly design“industrial-scale”reactors.It is known that the fluid dynamics in bubble columns is related to the prevailing bubble size distribution existing in the systems.In this respect,multiphase computational fluid dynamic simulations,in the Eulerian multi-fluid framework,are able to predict the local bubble size distributions and,thus,the global fluid dynamics from the fluid flow conditions and by applying modeling closured.In particular,in in“industrial-scale”reactors,owing to the large gas sparger openings,the“pseudo-homogeneous”flow regimedcharacterized by a wide spectrum of bubble sizesdis typically observed.Unfortunately,reliable predictions of the“pseudo-homogeneous”flow regime are limited up to now:one important drawback concerns the selection of appropriate models for the coalescence and break-up.A set of closure relations was collected at the Helmholtz-Zentrum Dresden-Rossendorf that represents the best available knowledge.Recently,the authors have extended the validation of this set of closure relations to the“pseudo-homogeneous”flow regime,by comparing the numerical predictions to a comprehensive experimental dataset(gas holdup,bubble size distributions and local flow measurements).Unfortunately,the previous study suffers from some limitations;in particular,in the previous experimental dataset,the bubble size distributions concerned only one axial position and a detailed characterization of the gas sparger was missing.This study contributes to the existing discussion and proposed a step ahead in the study of the“pseudo-homogenous”flow regime.To this end,we propose an experimental study,to improve the comprehensive dataset previously obtained.The novel datasetdobtained for two gas velocitiesdconcerns bubble size distributions at different axial and radial positions and a precise characterization of the gas sparger.The comprehensive bubble size distribution dataset may serve as basis to improve the coalescence and break-up closures;conversely,the precise characterization of the gas sparger served as an improved input to the numerical simulations.The numerical results,with two different lift force implementations,have been compared with the whole dataset and have been critically analyzed.Reasons for the discrepancies between the numerical results and the experimental data have been identified and may serve as basis for future studies. | Giorgio Besagni Fabio Inzoli Thomas Ziegenhein Dirk Lucas | 2019 | Petroleum2019，5，2： | 0 |
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