Marcio Ferreira Martins

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Verified

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• Doctor of Philosophy
• Professor (Associate) at Federal University of Espírito Santo

Smouldering combustion is an important and complex phenomenon that is central to a wide range of problems (hazards) and solutions (applications). A rich history of research in the context of fire safety has yet to be integrated with the more recent, rapidly growing body of work in engineered smouldering solutions. The variety of disciplines, materi...

Resumo-Electrical Resistance Tomography (ERT) is a technique employed in the industrial environment that reconstructs images formed by the impedance distributions inside a vessel. The method relies on measures from a data acquisition system, responsible to inject a current inside the vessel and measures the voltage on the boundaries, and sequential...

It is elementary to recognize the benefits and the negative impacts of the use of plastic materials on modern societies. Polyethylene (PE) is the major plastic component present in the municipal solid waste. In this paper, two types of low-density PE (LDPE) waste with different mechanical recycling stress histories were used to investigate the infl...

The dust generated and spread by free fall of bulk materials is analyzed through CFD simulations that allow visualization of the velocity vector field and the air masses close to the main material stream (core) that generate preferential paths for the formation and escape of dust. The air velocity field near a free-falling bulk material is obtained...

Residues with a large amount of organic content represent a potential for energy recovery. Specifically human feces, given the amount of global production and the environmental appeal, appear as a potential candidate for a new feed-stock. The objective of this work is to perform a thermodynamic assessment of human feces gasification considering for...

Marine biomass and fish by-products represent an underutilized resource, often discarded as waste by the fishing and processing industries, but with great bioenergy potential. This review explores their use as feedstocks in thermochemical processes such as combustion, pyrolysis, and gasification. Recent advancements in these conversion methods are...

In this study, we introduce a novel model for predicting the degradation of polymers subjected to mechanical stress. We begin by utilizing the dumbbell model, which describes a harmonic force centered around equilibrium, and then present a new model inspired by the finitely extensible nonlinear elastic approach, which imposes limits on polymeric de...

Ultrasonic flow meters (UFMs) by transit time are ubiquitous in industrial applications, mainly for their versatility and practicality. They are widely used in gas and liquid installations, such as the oil and gas industry or feedwater systems in nuclear power plants. Computational Fluid dynamics (CFD) techniques can be used as a tool to potentiall...

In the Reynolds-Averaged Navier-Stokes (RANS) approach in computational fluid dynamics, the paradigms that drive the procedure of the mesh sensitivity test are: the successive mesh refinement leads to more accurate results, and the choice of the turbulence model and wall function dictates the level of mesh refinement. However, as far as the simulat...

In this study, we propose a novel polymer rupture model that focuses on the transition from elastic to softening deformation under mechanical stimuli. Starting with the end-to-end vector approach and drawing from the finitely extensible nonlinear elastic (FENE) model, we develop a criterion for polymer breakage. This model improves upon previous ap...

Resumo: Um medidor de Pressão Diferencial é um instrumento de medição no qual possui a função de medir a diferença de pressão entre dois pontos, entre esses medidores destaca-se a placa de orifício, um dispositivo simples, de baixo custo, e é muito utilizada para estimar a pressão e consequente vazão de fluido que escoa através do equipamento. O mo...

Understanding the packing dynamics of granular materials, particularly iron ore pellets (IOPs), holds crucial significance for the mining industry, particularly in managing dust generation during handling and transportation processes. This study focuses on understanding the packing behavior of IOPs, with a particular emphasis on the angle of repose...

There are several methods for measuring single-phase flow, but it becomes more challenging to have a single device perform these flow measurements when dealing with multiphase flow. One method developed to perform these multiphase measurements is electrical impedance tomography (EIT), a non-invasive technique used to create images by injecting weak...

In the current configuration of Vale S.A.'s Pelletizing Plants, a glycerin solution is applied to control very small particle dust formed during the handling and transport of iron ore pellets. However, glycerin wastage occurs due to the application layout. It was proposed to optimize the application system using atomizing sprinkler spray at strateg...

A emissão de poeira mineral decorrente do transporte de pelotas de minério de ferro se apresenta como um significativo problema ambiental e, portanto, é proposto o uso de aspersão de solução aquosa para mitigar esse problema. Para otimizar esse processo, é sugerida a modelagem CFD do sistema. O estudo descreve a modelagem do domínio sólido do siste...

This work presents the development of a research facility to evaluate dust emissions involving wagon and stockpile models, considering operational and environmental variables. Furthermore, the influence of wagon vibration along the railway was considered to match the experimental conditions more closely to reality. The experimental apparatus consis...

Viewing the complexity of multiphase flows, in which multi-dimensional and time-changing fluid structures, known as flow patterns, must be captured, electrical impedance tomography (EIT) stands out as an alternative. Using an EIT system, this study presents an enhanced approach for measuring film thickness in two-phase flows. Incorporating bulk res...

The Ammonia and hydrogen hold great potential as carbon-free fuels, with promising applications in energy systems. Hydrogen, in particular, has generated high expectations as a facilitator of the carbon-free economy, but issues related to storage, distribution, and infrastructure deployment are delaying its full implementation. Ammonia, on the othe...

Pyrolysis is an effective method to valorize plastic waste and obtain value-added fuels. This study adopted the ANN-GA (artificial neural network-genetic algorithm) coupled with a central composition factorial design to optimize the oil production from the pyrolysis of waste polyolefins (WP). The interactive effects of PE mass fraction (20–80 wt%),...

In this work, a new concept of an energetically self-sustaining pyrolysis reactor, C-DPyR, is presented as an alternative to transforming polyethylene waste into wax. TGA and DSC were used to characterize the wax regarding thermal behavior among the recovered materials and perform kinetics computations. ATR-FTIR identified the functional groups con...

Sludge dewatering and drying are the main processes related to sludge management in wastewater treatment plants (WWTPs). Sludge disposal is a high-cost activity, and drying the sludge reduces its mass and volume, resulting in savings in storage, handling and transportation. The discoveries regarding the use of solar energy in agricultural studies p...

Sanitation equity and climate actions are world concerns stated by the United Nations in the Sustainable Development Goals. A significant source of greenhouse gas emissions is inputted by human wastes, either in developing countries through wastewater treatment plants, or in the underdeveloped world, through anaerobic digestion of fecal sludge in p...

This study aims to maximize the waste polypropylene (WPP) pyrolysis oil yield by regulating the operating parameters. The interactions of operating parameters on the distributions of WPP pyrolysis products were studied comprehensively by the neural fuzzy model. The genetic algorithm was utilized to determine the optimal operating parameters for WPP...

Defecating in precarious facilities or even in the open environment is an undeniable reality in low-income countries. A thermochemically-driven treatment unit (TDTU) can be a fast, viable, and efficient solution to mitigate the impacts of fecal matter on the surrounding environment, using the energy potential of feces to transform them into solid a...

This work aims to assess the identity of waxy products from plastic waste pyrolysis through a systematic review of papers calling wax a product directly yielded from pyrolysis. Also, a comprehensive synthesis of the most practiced characterization techniques for wax materials is carried out. This review was guided by formulating and answering essen...

Electrical Resistance Tomography (ERT) has the potentialities of non-intrusive techniques and high temporal resolution which are essential characteristics for multiphase flow measurements. However, high background conductivities, such as saline water in oil extraction, impose a limitation in ERT image reconstruction. Focusing on the operational lim...

This work investigates for the first time the classical aspects of smoldering front propagation in an annular reactor while presenting new concepts and making new contributions in methodologies of establishing the longitudinal temperature profile, calculating the front velocity, and determining the combustion front’s regime. Twenty-nine experiments...

Isothermal and non-isothermal multiphase flows, with and without phase change or chemical reactions, are of interest to researchers and engineers working in mining, oil-and-gas, power, nuclear, chemical-process, space, food, biomedical, micro- and nanotechnology, and other industries. Over the years, the “Jornada de Escoamentos Multifásicos” (JEM),...

Electrical impedance tomography is being widely applied to multiphase flow investigation in techniques such as void fraction and dispersed phase flow velocity measurements. The technique is desirable since it presents no ionizing radiation, has a high time resolution, and is relatively low cost. The system works by injecting bidirectional electrica...

Multiphase flow measurements allow monitoring and control of flows in real time. The extraction of oil in new fields has resulted in the demand for technologies capable of acting in extreme conditions, such as the high conductivity of saline water. Conductivity variation can impact EIT image reconstruction, and an alternative to ensure image recons...

During the fall of bulk materials, the air around the material mainstream is dragged by the non-slip condition, modifying the near pressure and velocity fields generating air currents around the bulk material fall. A particle that comes off the mainstream will be subject to the drag force due to the moving air and can be transported away, character...

The citizens of urban regions constantly suffer from dust particles present in the air that are dispersed mainly from the local industries' facilities. To understand the dispersion of dust caused by the free fall of granular material, we have observed that the dust dispersion is made by forming a toroidal vortex. We studied a vertical vortex to car...

The concomitant flow of a mixture containing two phases is a complex phenomenon. One of the reasons is that the phases’ interactions depend on the variations of the operational condition imposing the formation of different flow patterns that, in turn, can undergo pattern transition depending on the geometric cross-section change. This paper propose...

In smoldering reactors, a simple change in the way air is supplied to the system directly im-pacts the entire combustion process. Buoyancy forces may compete with the airflow enteringthe reactor, resulting in recirculation zones and stagnating the smoldering front. This paper assesses the competition between free convection and vacuum-induced airfl...

Improving water and sanitation safeties is part of the global agenda aiming at equitable sanitation, hygiene for all, and the end of open defecation. Nevertheless, despite the efforts made in recent years, the use of unimproved facilities and the practice of open defecation are still generating around 70 wt% of the worldwide fecal matter. The purpo...

This study studied the ex-situ catalytic pyrolysis of waste polyethylene (WPE) with activated carbon (AC). It was found that the operating parameters and AC/WPE mass ratio had complex interactions on the WPE-AC catalytic pyrolysis oil and gas yields. A hybrid method of artificial neural network (ANN) coupled with genetic algorithm (GA) was used to...

Electrical Impedance Tomography (EIT) is a technique that enables the reconstruction of the impedance distributions inside a vessel in a multiphase flow of industrial processes. Such a technique combines a data acquisition (DAQ) system to inject a current and to measure the voltages on the sensors and an inverse problem technique to reconstruct the...

Thermal analysis is a powerful combination of techniques used to characterize materials. In this chapter, three case studies were proposed to demonstrate possible applications of thermal analysis in the context of recycled plastics. By analyzing the pyrolysis of waste of recycled polyethylene, and through methodological procedures, the materials’ t...

Electrical Impedance Tomography (EIT) is a technique utilized in multi-phase flow for identifying flow patterns and void-fraction calculation. An image made of the conductivity of the domain is formed by combining an inverse problem and measurements. Recursive statistical inversion, such as the particle filters, is scarce when dealing with EIT. For...

The film thickness of a two-phase flow is a parameter of interest since it is of importance to the heat and mass transfer phenomena. A novel method is proposed based on electrical impedance tomography (EIT) and conductance sensors to measure this quantity. An analytical equation is developed to relate the differential voltage associated with a curr...

A detailed parametric sensitivity analysis reveals the effect on the numerically calculated profile factor of ultrasonic flow meters of various modeling parameters such as mesh refinement, boundary conditions, turbulence model, wall treatment, interpolation schemes and numerical integration. The flow field is solved using a commercial CFD code and...

One of the problems of the scalability to industrial applications of pyrolysis reactors is the high electric energy consumption. In this study, a novel device in which a self-sustaining combustion front drives the input energy for pyrolysis is proposed. A new methodology to define a representative longitudinal temperature profile based on the time-...

A detailed parametric sensitivity analysis reveals the effect on the numerically calculated profile factor of ultrasonic flow meters of various modeling parameters such as mesh refinement, boundary conditions, turbulence model, wall treatment, interpolation schemes and numerical integration. Interesting relations of these numerical parameters conce...

Multiphase flow measurements allow monitoring and control of flows in real-time. The extraction of oil in new fields has resulted in the demand for technologies capable of acting in extreme conditions, such as the high conductivity of saline water. Conductivity variation can impact EIT image reconstruction and an alternative to ensure image reconst...

Electrical Impedance Tomography is being widely applied to multiphase flow investigation, in techniques such as void fraction and dispersed phase flow velocity measurements. The technique is desirable since it presents no ionizing radiation, has a high time resolution, and it is relatively low-cost. The system works by injecting bidirectional elect...

Electrical Impedance Tomography (EIT) is a non-invasive technique in the study for flow measurement of multiphase flow. Its high temporal resolution allows achieving images of the flow in real-time. In oil extraction, the demand for deepwater requires research and technologies capable of predicting the influence of the saline water’s high conductiv...

This study investigated the interactive effects of temperature, residence time, and carrier gas flow rate on the liquid fuel production through the pyrolysis of waste polyethylene (WPE) in a bench-scale semi-batch reactor. To enhance the liquid fuel production, fifteen experiments were conducted based on a central composite design. The adaptive neu...

Electrical Impedance Tomography (EIT) is a technique that produces an image from a current injection inside the vessel. Since the problem is severely ill-posed, errors and noise can lead to instabilities in the image. One of these errors’ primary sources is the parasitic capacitances that shunt the signal to the ground. These non-idealities are pre...

Adaptive neural fuzzy model Simulated annealing algorithm A B S T R A C T In the present study, the waste polyethylene (PE) pyrolysis under different non-isothermal conditions was investigated to estimate the optimal conversions and pyrolysis rates. The pyrolysis study was carried out using Thermogravimetry (TG) of the virgin and the waste PE under...

Numerical simulation was used to build the thermochemical structure of the gasification process of human feces in a downdraft reactor. Samples with different compositions were used during simulations. The temperature profiles showed reasonable results compared to experimental data. The samples with the largest amount of moisture produced a gas with...

The Post-Graduate Program in Mechanical Engineering (PPGEM/UFES) under the auspices of the Brazilian Society of Mechanical Sciences (ABCM) invites you to participate in the 6th Multiphase Flow Journeys, JEM 2021, that will be held virtually in Vitória – Espírito Santo on May 17-20, 2021. The aim is to bring together two-days of training - composed...

Microalgae are potential feedstock for biofuels due to higher heating value and rapid growth rate. It can be cultivated in sewage, avoiding costs associated with clean water and nutrients, making the possibility of energy generation from wastewater treatment plants appealing. Compact microgeneration systems involving biomass gasifiers are already c...

Understanding the role of the exothermic pyrolysis is important for the design of reactors and gasifiers that seek to convert or even destroy fecal matter. In the present work, we reveal clear experimental evidence of fecal matter exothermic pyrolysis from human, pig, and chicken, under the conditions of differential scanning calorimetry. The resul...

p>A produção de microalgas nas Estações de Tratamento de Esgoto (ETE) está deixando de ser vista como um problema e passando a ser vislumbrada como matéria prima para a obtenção de biocombustível. A biomassa algal apresenta poder calorífico superior (PCS) similar ao da madeira e pode ser usado em processos termoquímicos para a geração de energia. C...

For a long time, the logistic of transportation of bulk materials, such as iron dust and other minerals, has been of great interest for industrial propositions. Along with the necessity of enhancement of such process, there is also the environmental concerns, since handling these materials generates a large amount of air pollution due to the spread...

A produção de microalgas nas Estações de Tratamento de Esgoto (ETE) está deixando de ser vista como um problema e passando a ser vislumbrada como matéria-prima para a obtenção de biocombustível. A biomassa algal apresenta poder calorífico superior (PCS) similar ao da madeira e pode ser usado em processos termoquímicos para a geração de energia. Con...

Microalgae are a promising alternative energy source for the future due to their high growth rate, cultivation potential in a wastewater environment, and its higher heating value (HHV). However, until nowadays, only the properties for pure species of microalgae that disregard the presence of coagulants used at the harvesting stage are known. In thi...

Microalgae are a potential source of biomass for the production of energy, which is why the amount of research on this topic has increased in recent years. This work describes the state of the art of microalgae production from wastewater treatment plants (WWTP), its potential to generate electricity and the scale in which it is possible. The method...

The present work aims to verify the performance of the Volume of Fluid (VOF) model on flow pattern characterization in inclined circular cross-section pipe. For this purpose, a 42 mm diameter tube with 4.5 m length was used in numerical and experimental tests involving two flow patterns: slug and churn. VOF multiphase flow model combined with k − ε...

p>Microalgas sao consideradas urna fonte potencial para a produgáo de biocombustí- veis e o número de pesquisas sobre o tema vem crescendo nos últimos anos. Dentre os diferentes processos de conversáo de bio- massa em energia, a gaseificagáo apresenta algumas vantagens importantes, como maior eficiencia energética e menor emis- sáo de C02. Para map...

Sequential Monte Carlo or Particle Filter Methods have been widely used to deal with sequential Bayesian inference problems in several fields of knowledge. This technique involves approximation of probability sequences distributions of interest, by means of a large set of random samples, i.e. particles that are propagated along time with a simple S...

Given the large volume of waste generated each year, its associated environmental impact and the difficulties of their destination, especially hazardous waste, controlled combustion can provide a solution to the problem. Among hazardous waste, plastics, specifically polyethylene and human fecal waste stand out. However, a detailed study is necessar...

This work uses ThermoGravimetric (TG) and Differential ThermoGravimetric (DTG) analyses to evaluate the Arrhenius parameters, pre-exponential factor, and apparent activation energy, of biomass from stabilization ponds undergoing pyrolysis and combustion. The TGA was carried out by using a ramp temperature of 25-700 °C with a heating rate of 2 °C mi...

Due to the growing energy demands of the world and the rapid depletion of fossil fuels, it is necessary to study new energy sources. The waste have a great potential to be tapped, as besides being a raw material abundant, their use helps in reducing the level of environmental pollution and curbing the volume of waste in cities. However, one should...

ANP vem mantendo desde 1999 junto a Universidades brasileiras um Programa de Recursos Humanos (PRH/ANP) destinado à formação de pessoal de nível superior, em resposta à expansão da indústria do petróleo, gás natural e biocombustíveis. BIOCOMBUSTÍVEIS NO BRASIL: FUNDAMENTOS, APLICAÇÕES E PERSPECTIVAS é fruto de um trabalho conjunto, executado de man...

Enhanced technologies from oil recovery to unconventional fuels - oil shale, oil sands and extra-heavy oil – have in common complex chemical reactions processes. This paper is about the formulation and optimization of the chemical mechanism especially in oil shale and semi-coke combustion. The Levenberg–Marquardt algorithm was used to minimize the...

The kinetic parameters estimation is a very important step in building the reaction schemes commonly present in several fields of engineering. This step was reformulated as an optimization problem and it was minimized by using the Levenberg-Marquardt algorithm. The inverse technique was implemented with the help of thermogravimetric analysis. Thus,...

Co-current combustion front propagation in a bed of crushed oil shale (OS) leads to the production of liquid oil, of a flue gas and of a solid residue. The objective of this paper was to provide a detailed chemical characterization of Timahdit oil shale and of its smoldering combustion products. The amount of fixed carbon (FC) formed during devolat...

a b s t r a c t Timahdit oil shale was used as a porous medium to characterize the structure of a combustion front prop-agating with co-current downward air supply. A new 1D experimental device was first calibrated using a model porous medium. With the model porous medium, the front propagates as a plane and horizontal surface while using oil shale...

Oil shale are sedimentary rocks that can be found in many places over the world; they contain typically 20% of organic matter. The recovery of this matter as a liquid oil or as gas presents a considerable potential in energy supply. Among the processes to achieve this, in-situ combustion or the combustion in special reactors are very promising tech...

We describe here a new experimental device developed for the study of a combustion front propagation in a reactive medium: crushed oil shale (500 to 1000 µm). We are interested in the propagation of a front supplied by air in co-current. The cell is a vertical cylinder of 90mm internal diameter and 300mm height, made up of an insulating material. T...