Rodrigo Bettega

Rodrigo Bettega

Universidade Federal de São Carlos

H-index: 15

Latin America-Brazil

About Rodrigo Bettega

Rodrigo Bettega, With an exceptional h-index of 15 and a recent h-index of 13 (since 2020), a distinguished researcher at Universidade Federal de São Carlos,

His recent articles reflect a diverse array of research interests and contributions to the field:

Numerical and experimental estimation of global gas holdup in a bubble column using computational fluid dynamics (CFD)

CFD evaluation of the influence of the draft tube on solids circulation in conical spouted beds

Energy analysis of the convective drying of iron ore fines: Original scientific paper

Secagem convectiva de concentrado de minério de ferro: abordagem experimental e simulações por fluidodinâmica computacional

Convective drying of iron ore fines: A CFD model validated for different air temperatures and air velocities

Hydrodynamic comparison of different geometries of square cross-section airlift bioreactor using computational fluid dynamics

Evaluation of the effect of cone geometry on spouted bed fluid dynamics by CFD-DEM simulation

Drying of Brazilian Iron Ore in Spherical Pellets

Rodrigo Bettega Information

University

Universidade Federal de São Carlos

Position

___

Citations(all)

609

Citations(since 2020)

398

Cited By

352

hIndex(all)

15

hIndex(since 2020)

13

i10Index(all)

22

i10Index(since 2020)

17

Email

University Profile Page

Universidade Federal de São Carlos

Top articles of Rodrigo Bettega

Numerical and experimental estimation of global gas holdup in a bubble column using computational fluid dynamics (CFD)

Authors

ACB Silva,MN Esperança,RD Pereira,AC Badino,R Bettega

Journal

Journal of the Brazilian Society of Mechanical Sciences and Engineering

Published Date

2023/10

Bubble column bioreactors can provide adequate heat and mass transfer, rapid mixing and good suspension of solids. The influence of the lift force in square cross-sectional bubble columns is being studied in order to evaluate its importance in CFD simulations. In this work, the global gas holdup ( was analyzed experimentally and numerically using CFD. Euler–Euler model was applied for the gas–liquid multiphase simulations. Different specific air flow rates (1.0–5.0 vvm) were simulated in order to evaluate the inclusion of lift interfacial force in the modeling and the effect of air flow rate in this analysis. The simulations considering lift force effect showed greater agreement between the experimental data and those estimated by computational fluid dynamics, with the highest values of found for the higher specific air flow rate (5 vvm) and the minor bubble diameter (4 mm) analyzed in this study.

CFD evaluation of the influence of the draft tube on solids circulation in conical spouted beds

Authors

Amarílis S Souza,Rodrigo Béttega

Journal

Journal of the Brazilian Society of Mechanical Sciences and Engineering

Published Date

2023/9

The particle circulation is important to guarantee process homogeneity and efficiency in conical spouted beds. This work investigated the influence of the draft tube on the solids circulation of conical spouted beds using a Computational Fluid Dynamics (CFD) Euler–Euler multiphase model. The solids mass flow in the spout and the particle cycle time were estimated for different conditions of solids bed height and inlet air velocities. Validation of the mathematical model was performed comparing the minimum spouting velocity according to experimental data from the literature, presenting deviations of 1.6% and 7.5%. Simulation results indicated a reduction in the minimum spouting velocity between 46.7 and 53.0% after the insertion of the draft tube in the equipment. However, the draft tube reduced the solids mass flow rate in the spout by approximately 70.5–78.0% when compared to configurations without the tube …

Energy analysis of the convective drying of iron ore fines: Original scientific paper

Authors

Amarílis Severino Souza,Thiago César de Souza Pinto,Alfredo Moisés Sarkis,Thiago Faggion De Pádua,Rodrigo Béttega

Journal

Chemical Industry & Chemical Engineering Quarterly

Published Date

2023/4/9

Drying operations in iron ore processing plants have a particularly high energy demand due to the massive solid flow rates employed in this industry. A 3 3 full-factorial design was applied to investigate the effects of air temperature, airflow velocity, and solids load on the drying time and the specific energy consumption (SEC) of the convective drying of iron ore fines in a fixed bed. The results demonstrated that each drying air condition was associated with an optimal solids load that minimized the SEC. A load of 73 g (bed height of about 0.8 cm) was identified and validated as the optimal condition in terms of energy consumption for the configuration with the highest air temperature (90 C) and airflow velocity (4.5 m/s). This condition resulted in a drying time of 29.0 s and a corresponding SEC of 12.8 MJ/kg to reduce the moisture from 0.11 kg water/kg dry solids to a target of 0.05 kg water/kg dry solids. Identifying the optimum values for the process variables should assist in designing and operating energy-efficient convective dryers for iron ore fines.

Secagem convectiva de concentrado de minério de ferro: abordagem experimental e simulações por fluidodinâmica computacional

Authors

Rodrigo Béttega

Published Date

2023/2/27

Os chutes de transferência convencionais são equipamentos utilizados para mudar a direção do escoamento de sólidos dos transportadores de correia. Durante a operação, o sólido transportado pela correia superior entra no chute e depois cai na parte de baixo, onde é direcionado para o transportador de correia inferior. Uma patente da empresa Vale SA prevê a adaptação do chute de transferência como unidade de secagem industrial, cujo funcionamento consiste na alimentação de ar quente na base do equipamento, que ascende e troca calor e massa com o minério úmido que cai. Uma das principais vantagens do equipamento adaptado é a implementação de um processo de redução de umidade para concentrados de minério de ferro em um equipamento já instalado na linha de produção. No entanto, por ser uma nova tecnologia, muitos aspectos de sua operação são desconhecidos. O objetivo deste trabalho foi simular por fluidodinâmica computacional (CFD) a operação do equipamento de secagem em chute, referente a uma unidade instalada na planta de pelotização de São Luís/MA, abordando e avaliando os fenômenos de transporte de movimento, calor e massa envolvidos. Primeiro, optou-se por obter experimentalmente uma correlação para o coeficiente de transferência de massa (K), que é um parâmetro-chave a ser implementado em simulações por CFD, a fim de descrever a taxa de secagem do minério de ferro com maior precisão. O procedimento para obtenção e validação da correlação para K foi feito inicialmente em um secador em escala de laboratório, denominado FB-2. Experimentos de secagem em camada …

Convective drying of iron ore fines: A CFD model validated for different air temperatures and air velocities

Authors

Amarílis S Souza,Thiago C Souza Pinto,Alfredo M Sarkis,Thiago Faggion de Pádua,Rodrigo Béttega

Journal

Drying Technology

Published Date

2023/11/20

In this research, a granular Eulerian multiphase model coupled with heat and mass transfer was used to simulate the convective drying process of iron ore fines. The CFD model was validated with experimental data for different air temperatures and air velocities. Convective drying experiments were performed using laboratory-scale equipment in order to obtain drying kinetics data for iron ore fines at air temperatures up to 140 °C and air velocities up to 15 m/s. The drying system had combined characteristics of fluidized bed and pneumatic transport. Numerical results showed good agreement with experimental data (average RMSE of 3.9 × 10−3) for the moisture content for nine drying air conditions. Since the coupled momentum, heat and mass transfer model could accurately and validly estimate the drying rate for iron ore fines according to the local conditions of the drying air in laboratory-scale equipment, it …

Hydrodynamic comparison of different geometries of square cross-section airlift bioreactor using computational fluid dynamics

Authors

Mateus N Esperança,Marcel O Cerri,Vítor T Mazziero,Rodrigo Béttega,Alberto C Badino

Journal

International Journal of Chemical Reactor Engineering

Published Date

2023/10/16

The hydrodynamics of airlift bioreactors, which offer an interesting alternative to conventional stirred-tank bioreactors, has generally been evaluated using experimental approaches, requiring time, energy, and reagents. However, computational fluid dynamics (CFD) has emerged as an important and valuable tool for the analysis and design of these devices, saving time and experimental effort, while providing a large amount of information. In this study, four geometries of a square cross-section 10-L split airlift bioreactor operating with distilled water were simulated using CFD, and the hydrodynamics variables gas hold-up and liquid velocity were evaluated. CFD satisfactorily predicted the hydrodynamic parameters, when compared to experimental data, allowing adequate prediction of the shear rate distribution in airlift bioreactors. The results indicated that different shear rate distributions were obtained by …

Evaluation of the effect of cone geometry on spouted bed fluid dynamics by CFD-DEM simulation

Authors

JNM Batista,R Béttega

Journal

Drying Technology

Published Date

2022/7/12

The spouted bed provides efficient gas-solid contact, favoring heat and mass transfer. Thus, it has been applied to various physical and chemical processes. In this work, the effects of six cone angles (28°, 30°, 45°, 60°, 75°, and 90°) on the fluid dynamics of a spouted bed with sorghum grains were analyzed by CFD-DEM. Based on fluid dynamics principles, the objective was to identify better configurations for the drying process performance. Smaller cone angles provided better solids circulation, with a higher mass transfer coefficient (kc), granular temperature (gt), and solids mass flow rate (Ws), together with a shorter cycle time (tc). For the range of cone angles analyzed, increase of the cone angle reduced Ws by about 75% and increased tc 4-fold.

Drying of Brazilian Iron Ore in Spherical Pellets

Authors

JH Okazaki,AS Souza,TC Souza Pinto,R Béttega,TF Pádua

Journal

Proceedings of the 22nd International Drying Symposium

Published Date

2022

Heating and drying are important in order to meet pellet specifications in the steel making industry. Besides, the drying of iron ore for trading may be effected by the intermittent formation of agglomerates. As a consequence, it is important to understand the drying of such materials. Drying assays of spherical pellets suspended in an oven at 50oC were developed. We analyzed and compared the drying kinetics of two pellets (2.0 cm and 1.4 cm). A discussion was presented about the drying behavior. Moreover, the critical moisture content, constant drying rate, and effective diffusivity for the hindered drying were estimated.

SECAGEM CONVECTIVA DE MINÉRIO DE MANGANÊS

Authors

LETÍCIA F HIDALGO,THIAGO CS PINTO,ALFREDO M SARKIS,THIAGO F PÁDUA,RODRIGO BÉTTEGA

Published Date

2022

O minério de manganês tem ampla utilização no setor siderúrgico para a produção de aço com alta qualidade. Entre a extração junto às minas até sua exportação, o minério passa por processos que afetam sua umidade. A umidade pode ser útil na redução da geração de finos e consequentes perdas ou risco ambiental durante o transporte. Entretanto, elevados valores de umidade prejudicam operações de manuseio e transporte por navios. Dessa forma, o presente trabalho avaliou a secagem convectiva do minério de manganês em diferentes umidades iniciais (0, 25, 0, 33 e 0, 43 bs) e temperaturas (70, 80 e 90 C). Foi utilizado material com granulometria inferior a 1 mm, proveniente da mina do Azul no Pará. Nas condições avaliadas, o minério apresentou um período bem definido de secagem a taxa constante, seguido do período a taxa decrescente, com valores de umidade crítica próximos de 0, 18 bs Foram observadas diferenças estruturais no minério de acordo com sua umidade, com tendência a aglomeração para valores de 0, 33 e 0, 43 bs, as quais podem ter influenciado nas maiores taxas durante o período constante. O modelo de Overhults foi ajustado aos dados de secagem do período decrescente com valores de R² entre 0, 9946 a 0, 9979.

Linking maximal shear rate and energy dissipation/circulation function in airlift bioreactors

Authors

Mateus N Esperança,Mariane M Buffo,Caroline E Mendes,Guilherme Y Rodriguez,Rodrigo Bettega,Alberto C Badino,Marcel O Cerri

Journal

Biochemical Engineering Journal

Published Date

2022/1/1

The interest in pneumatic bioreactors is related to their good mass transfer capacity, as well as lower operating costs, due to the simple mechanical structure. Knowledge of the transport phenomena and hydrodynamics of bioreactors is important to enable definition of the best bioreactor model and operating conditions for a specific bioprocess, with the imposed shear being one of the most difficult to quantify. For stirred tanks, the fragmentation of microorganisms has been well correlated with a hydrodynamic parameter called the “energy dissipation/circulation function” (EDCF). However, there have been no estimates of the EDCF for pneumatic bioreactors. The present work proposes a methodology to estimate the EDCF for different pneumatic bioreactors and operating conditions using two approaches: Computational Fluid Dynamics and, comparison of pellet fragmentation in conventional and pneumatic …

Analysis of the interfacial force effect on simulated oxygen transfer of a bubble column using computational fluid dynamics

Authors

Ana Carolina Borges Silva,Gustavo Batista,Mateus Nordi Esperança,Alberto Colli Badino,Rodrigo Béttega

Journal

Digital Chemical Engineering

Published Date

2022/12/1

Pneumatic bioreactors are a class of reactors increasingly used in bioprocesses, since they provide adequate heat and mass transfer, rapid mixing and good suspension of solids. In this work, oxygen transfer from a square-cross section bubble column bioreactor was evaluated experimentally and numerically using computational fluid dynamics (CFD), and the results were compared with data obtained experimentally. Different specific air flow rates (1.0, 3.0 and 5.0 vvm) and drag and lift interfacial forces, were considered in the numerical simulations using the two-fluid Eulerian model. The simulations considering the presence of lift force showed results closer to the experimental data, with the highest values of kLa found for the higher specific air flow rate (5 vvm) analyzed in this study.

PROJETO DE UMA UNIDADE DE SECAGEM CONVECTIVA ADAPTADA PARA OPERAÇÃO COM PRODUTOS DA MINERAÇÃO

Authors

Luca Martins Marini,Rodrigo Béttega

Published Date

2021/2/25

Dentre os principais meios de transporte para o minério de ferro, o ferroviário se destaca. Entretanto, o transporte ferroviário tem como dificuldade a perda de material particulado ao longo do trajeto da produção para os terminais portuários de embarque. Maiores teores de umidade do minério podem auxiliar com as perdas de transporte, porém, essa umidade pode ser um problema para o transporte hidroviário seja pela depreciação do produto ou mesmo eventuais problemas com a legislação que regula a umidade máxima permitida para o transporte de minério de ferro por navios. Assim, o estudo de operações de secagem almejando a redução da umidade do material é de alta importância neste setor, resultando em possíveis economias e maior valor agregado do produto final/exportado. Considerando o contexto da secagem de minério e os desafios presentes, o projeto proposto teve como objetivo geral …

Determination of the physical and interaction properties of sorghum grains: Application to computational fluid dynamics–discrete element method simulations of the fluid …

Authors

JNM Batista,DA Santos,R Béttega

Journal

Particuology

Published Date

2021/2/1

Computational simulation is an important tool for design and improvement of industrial units. Computational fluid dynamics (CFD) coupled with the discrete element method (DEM) has been applied to simulate drying equipment that usually involves gas–solid flow. For reliable results of CFD–DEM simulations, the properties related to the interactions of the material within the industrial equipment, such as the restitution or friction coefficients, must be known. In this study, CFD–DEM was applied to simulate the fluid dynamics inside a conical spouted bed operating with sorghum grains. The physical properties of the particulate phase and the particle–particle and particle–wall interaction parameters were determined by the direct measurement approach and applied to CFD–DEM. The interaction parameters were experimentally determined, including the particle–particle interaction parameters of η = 0.46, μS = 0.79, and …

Evaluation of different mathematical models in the CFD-DEM simulation of conical spouted bed fluid dynamics

Authors

JNM Batista,Rodrigo Béttega

Journal

Chemical Industry & Chemical Engineering Quarterly

Published Date

2021

The input parameters, empirical, and semi-empirical models significantly influence the responses obtained by CFD-DEM simulations. In this work, the effects of three turbulence models, three conditions of the particle rotation, and five drag models, on the fluid dynamic behavior of a conical spout bed applied to the drying of sorghum grains were evaluated. Experimental data on the solids pressure drop, height, and shape of the fountain were used to validate the simulations. Results showed the importance of including the particle rotation in the model to approximate the results simulated with the experimental behavior. Compared with experimental data, considering the particle rotation by the Dennis et al. model, the deviation was 2% for the fountain height and 9.18% for the pressure drop. Whereas, for the model without the particle rotation, the deviations were 106.33 and 42.31% for the fountain height and pressure drop, respectively. For the analyzed case, the standard k-ε turbulence model showed a greater agreement with the experimental data. For the drag models evaluated, the best fit with the experimental data was obtained by the Koch-Hill drag model, followed by the Gidaspow model, with deviations less than 10%.

Characterization and drying kinetics of iron ore pellet feed and sinter feed

Authors

TC Souza Pinto,AS Souza,JNM Batista,AM Sarkis,Laurindo de Salles Leal Filho,Thiago Faggion de Pádua,R Béttega

Journal

Drying Technology

Published Date

2021/7/12

The moisture content of iron ore must be suitable for safe handling and transporting operations. Here, the characterization and drying kinetics of iron ore concentrates were presented and recommendations for the design of dryers were discussed. Pellet feed and sinter feed showed a high amount of fine particles (8–20% dp<10 µm) and a low pore volume (Vpore<10 µm). An ample period for drying at constant rate was observed (critical moisture around 5%), indicating that drying processes aiming at a moderate moisture reduction could be performed within this period. These findings contribute to the design of dryers and support economic operations.

Análise do diâmetro e da velocidade de bolhas de ar sob diferentes tensões superficiais: Estudo experimental e simulação numérica cfd

Authors

Hugo Henrique Jacomini,Junia Natalia Mendes Batista,Rodrigo Béttega

Journal

The Journal of Engineering and Exact Sciences

Published Date

2020/9/4

No presente trabalho, avaliou-se a formação de bolhas de ar em um tanque de flotação empregando diferentes tensões superficiais através de testes experimentais e utilizando a fluidodinâmica computacional (Computational Fluid Dynamics-CFD). As simulações foram conduzidas utilizando o software FLUENT® 18.2. Para a verificação do modelo proposto, os dados simulados de velocidade e diâmetro de bolha foram comparados aos resultados experimentais, tanto quantitativamente quanto qualitativamente. Através dos experimentos e das simulações CFD foi possível obter o comportamento e a dinâmica das bolhas para as diferentes tensões superficiais, verificando-se desvios aceitáveis entre os dados de velocidade de bolha obtidos experimentalmente e por meio de simulações. Os diâmetros das bolhas experimentais e simulados seguiram a mesma tendência.

Sparger design as key parameter to define shear conditions in pneumatic bioreactors

Authors

Mateus N Esperanca,Caroline E Mendes,Guilherme Y Rodriguez,Marcel O Cerri,Rodrigo Bettega,Alberto C Badino

Journal

Biochemical engineering journal

Published Date

2020/4/15

The average shear rate (γ˙ a v) is a parameter used to characterize the shear environment in bioreactors, enabling comparison of the performances of different bioreactor models in terms of microorganism morphology and viability, and consequently bioproduct formation. Based on this approach, pneumatic bioreactors have been classified as low shear devices. However, the shear behavior cannot be generalized over a wide range of operating conditions, suggesting that the maximum shear rate (γ˙ m a x) may be more suitable for the purpose of bioreactor performance comparison. Therefore, the aim of this work was to evaluate average and maximum shear rates in pneumatic bioreactors (bubble column and airlift), based on computational fluid dynamics (CFD) simulations. Concentric-duct and split airlift bioreactors exhibited higher γ˙ a v values, compared to the bubble column design, due to the nature of the liquid …

Oxygen Transfer and Fragmentation of Aspergillus niger Pellets in Stirred Tank and Concentric-Duct Airlift Bioreactors

Authors

Mariane M Buffo,Mateus N Esperança,Rodrigo Béttega,Cristiane S Farinas,Alberto C Badino

Journal

Industrial biotechnology

Published Date

2020/4/1

The hydrodynamic environment in bioreactors is an important parameter because cultivation conditions that provide satisfactory oxygen transfer rates tend to be harmful to microorganisms, due to the effect of shear on the cellular structure. Consequently, it is a challenge to find the ideal set of bioreactor operating conditions that favor production of the metabolites of interest. The present work evaluated the fragmentation of Aspergillus niger pellets in two different types of bioreactor: a conventional stirred tank bioreactor (STB) and a concentric-duct airlift (CDA) bioreactor. Both were operated under similar oxygen transfer or shear conditions. Oxygen transfer was quantified by means of the volumetric oxygen transfer coefficient (kLa). The shear condition was determined using the average shear rate (), obtained using computational fluid dynamics (CFD), together with pellet fragmentation. The findings showed that the …

Experimental and CFD Study of Heat Transfer in Spouted Beds: Analysis of Nusselt Number Correlations

Authors

J NM Batista,RC Brito,JT Freire,R Béttega

Journal

Theoretical Foundations of Chemical Engineering

Published Date

2020/11

Abstract The application of CFD to evaluate heat transfer in spouted beds remains scarce. Furthermore, the few reported studies about this have used a correlation proposed to determine the Nusselt number for fixed and fluidized beds. Therefore, the aim of this work was to investigate the effects of the different correlations in describing heat transfer in a conical spouted bed, using a two-dimensional Euler-Euler approach. Correlations proposed specifically for a spouted bed were implemented by means of a user-defined function. The simulated fluid phase temperatures within the bed were compared with experimental data obtained for a spouted bed operating with sorghum seeds (Sorghum bicolor (L.) Moench). Correlations that take into consideration geometric parameters that are important in spouted bed design were implemented. The comparison among experimental and simulated data …

AVALIAÇÃO POR CFD DA INFLUÊNCIA DO MODELO DE BALANÇO POPULACIONAL NA DISPERSÃO DE LÍQUIDO EM UM LAVADOR VENTURI

Authors

Luca Martins Marini,Amarílis Severino,Vádila Giovana Guerra Béttega,Rodrigo Béttega

Journal

The Journal of Engineering and Exact Sciences

Published Date

2020/9/4

Neste trabalho foi analisada a influência da inclusão do Modelo de Balanço Populacional (MBP) em simulações por Fluidodinâmica Computacional (CFD) na dispersão do líquido injetado em um Lavador Venturi. Foram comparados os resultados de simulações com e sem a inclusão do MBP, bem como avaliada a inclusão dos efeitos dos modelos de quebra e coalescência de gotas. Os resultados mostraram que a inclusão do MBP apresentou efeito pouco pronunciado sobre a queda de pressão no Lavador Venturi. Nos contornos de fração volumétrica das gotas, foi observado que a inclusão do MBP possibilitou avaliar a variação de diâmetro de gota e a sua dispersão no equipamento. Simulações por CFD utilizando o MBP podem contribuir para projetos de Lavadores Venturi, de modo a verificar a dispersão de líquido injetado que a geometria correspondente proporciona.

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Rodrigo Bettega FAQs

What is Rodrigo Bettega's h-index at Universidade Federal de São Carlos?

The h-index of Rodrigo Bettega has been 13 since 2020 and 15 in total.

What are Rodrigo Bettega's top articles?

The articles with the titles of

Numerical and experimental estimation of global gas holdup in a bubble column using computational fluid dynamics (CFD)

CFD evaluation of the influence of the draft tube on solids circulation in conical spouted beds

Energy analysis of the convective drying of iron ore fines: Original scientific paper

Secagem convectiva de concentrado de minério de ferro: abordagem experimental e simulações por fluidodinâmica computacional

Convective drying of iron ore fines: A CFD model validated for different air temperatures and air velocities

Hydrodynamic comparison of different geometries of square cross-section airlift bioreactor using computational fluid dynamics

Evaluation of the effect of cone geometry on spouted bed fluid dynamics by CFD-DEM simulation

Drying of Brazilian Iron Ore in Spherical Pellets

...

are the top articles of Rodrigo Bettega at Universidade Federal de São Carlos.

What is Rodrigo Bettega's total number of citations?

Rodrigo Bettega has 609 citations in total.

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