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Papers by Pedro Miguel Rebelo Resende

Machines

Industry 5.0 combines automation/digitalization with human capabilities to create a more intuitiv... more Industry 5.0 combines automation/digitalization with human capabilities to create a more intuitive, interactive, and sustainable working environment. Additive manufacturing, widely known as 3D printing, is a key technology used to increase customization and efficiency and reduce waste in manufacturing. Industry 5.0 enables manufacturers to create environmentally sustainable and consumer-centric products. However, there is a lack of studies on the introduction of AM technologies to Industry 5.0. The present study investigates the use of additive manufacturing for the fabrication of metallic parts/assemblies and the correlation between human-centric technologies, additive manufacturing, and environmental sustainability. Effective communication between these components is the key to achieving the goals of Industry 5.0, and the important parameters are shown in this article. The present work is focused on an overview and the impact of the futuristic subdivision of additive manufacturing...

Clean Technologies

One of society’s major current challenges is carbon dioxide emissions and their consequences. In ... more One of society’s major current challenges is carbon dioxide emissions and their consequences. In this context, new technologies for carbon dioxide (CO2) capture have attracted much attention. One of these is carbon capture and utilization (CCU). This work focuses on the latest trends in a holistic approach to carbon dioxide capture and utilization. Absorption, adsorption, membranes, and chemical looping are considered for CO2 capture. Each CO2 capture technology is described, and its benefits and drawbacks are discussed. For the use of carbon dioxide, various possible applications of CCU are described, starting with the utilization of carbon dioxide in agriculture and proceeding to the conversion of CO2 into fuels (catalytic processes), chemicals (photocatalytic processes), polymers, and building supplies. For decades, carbon dioxide has been used in industrial processes, such as CO2-enhanced oil recovery, the food industry, organic compound production (such as urea), water treatmen...

International Journal of Heat and Fluid Flow, 2021

An improved k − ω turbulence model for viscoelastic fluids is developed to predict turbulent flow... more An improved k − ω turbulence model for viscoelastic fluids is developed to predict turbulent flows, with polymeric solutions described by the finitely extensible nonlinear elastic-Peterlin constitutive model. The k − ω model is tested against a wide range of direct numerical simulation data in fullydeveloped channel flow, with different rheological parameter combinations, and can predict all regimes of drag reduction (low, intermediate and high) with good performance. Closures are improved for the N LT ij term, which captures the polymer extension due to turbulent fluctuations; a modified damping function, f µ , which accounts for the turbulent kinetic energy redistribution process; and the viscoelastic destruction term, E τp. The main

Solid Fuel Chemistry, 2022

Sustainability, 2022

The growing increase in greenhouse gases, especially carbon dioxide (CO2), by anthropogenic activ... more The growing increase in greenhouse gases, especially carbon dioxide (CO2), by anthropogenic activities can be linked to extreme climate events, such as intensive droughts, floods, or hurricanes, and has led to several studies focused on reducing the concentration of this greenhouse gas in the atmosphere. Some technologies, such as carbon capture and storage (CCS), can potentially sequester billions of tons of CO2 per year. One of the promising methods is the use of carbon mineralization as a CCS methodology. For this approach, some minerals can be investigated, such as wollastonite, which can be obtained from agricultural waste recovery. One topic of interest in these studies is agriculture, demonstrating that it can play an important role in climate change mitigation. This work presents a critical review of the studies of rice waste use for potential synthesizing wollastonite as a path for CO2 storage, promoting the circular economy. Several works were analyzed and presented, addre...

Energies, 2022

This work reports a numerical investigation of microcombustion in an undulate microchannel, using... more This work reports a numerical investigation of microcombustion in an undulate microchannel, using premixed hydrogen and air to understand the effect of the burner design on the flame in order to obtain stability of the flame. The simulations were performed for a fixed equivalence ratio and a hyperbolic temperature profile imposed at the microchannel walls in order to mimic the heat external losses occurred in experimental setups. Due to the complexity of the flow dynamics combined with the combustion behavior, the present study focuses on understanding the effect of the fuel inlet rate on the flame characteristics, keeping other parameters constant. The results presented stable flame structure regardless of the inlet velocity for this type of design, meaning that a significant reduction in the heat flux losses through the walls occurred, allowing the design of new simpler systems. The increase in inlet velocity increased the flame extension, with the flame being stretched along the ...

Abstract. The new stress term in the time-average momentum equation of the modified generalised N... more Abstract. The new stress term in the time-average momentum equation of the modified generalised Newtonian fluid model of Cruz and Pinho (2003) is modeled for improved predictions of turbulent viscoelastic flows. The modified generalised Newtonian model was introduced by Pinho (2003) to mimic viscoelastic effects of fluids exhibiting drag reduction in turbulent pipe flow. The new stress quantifies the cross-correlation between the fluctuating viscosity and the fluctuating rate of strain and had been neglected in the k-ε low Reynolds number model originally developed by Cruz and Pinho (2003). The inclusion of this model for the new stress improves the predictions of turbulent kinetic energy ( k+) in drag reducing pipe flow at the cost of a negligible deterioration in the prediction quality of other quantities for some of other fluids tested and for which the literature provides data. The original model of Cruz and Pinho (2003) has also been modified to correct for a mistake and this w...

Applied Sciences

A viscoelastic turbulence model in a fully-developed drag reducing channel flow is improved, with... more A viscoelastic turbulence model in a fully-developed drag reducing channel flow is improved, with turbulent eddies modelled under a k–ε representation, along with polymeric solutions described by the finitely extensible nonlinear elastic-Peterlin (FENE-P) constitutive model. The model performance is evaluated against a wide variety of direct numerical simulation data, described by different combinations of rheological parameters, which is able to predict all drag reduction (low, intermediate and high) regimes with good accuracy. Three main contributions are proposed: one with a simplified viscoelastic closure for the NLTij term (which accounts for the interactions between the fluctuating components of the conformation tensor and the velocity gradient tensor), by removing additional damping functions and reducing complexity compared with previous models; second through a reformulation for the closure of the viscoelastic destruction term, Eτp, which removes all friction velocity depen...

AIP Conference Proceedings, 2008

A closure is developed for the time-averaged cross correlation between fluctuating conformation a... more A closure is developed for the time-averaged cross correlation between fluctuating conformation and rate of strain tensors appearing in the evolution equation of the conformation tensor for the polymer stress of the FENE-P fluid. The closure was calibrated against DNS data pertaining to the low and high drag reduction regimes.

A second order closure for predicting turbulent flows of viscoelastic fluids is proposed in this ... more A second order closure for predicting turbulent flows of viscoelastic fluids is proposed in this work and its performance is assessed by comparing its predictions with experimental data for fully-developed pipe flow. The model is an extension of an existing Reynolds stress closure for Newtonian fluids and includes low Reynolds number damping functions to properly deal with wall effects. The

Journal of Non-Newtonian Fluid Mechanics, 2011

Journal of Non-Newtonian Fluid Mechanics, 2004

A model is proposed for the new stress term in the momentum equation of a modified generalised Ne... more A model is proposed for the new stress term in the momentum equation of a modified generalised Newtonian fluid that is used to mimic viscoelastic effects of fluids exhibiting drag reduction in turbulent pipe flow. The new stress quantifies the cross-correlation between the fluctuating viscosity and the fluctuating rate of strain and had been neglected in the k-ε low Reynolds number model originally developed by Cruz and Pinho [J. Non-Newt. Fluid Mechanics 114 (2003) 109]. With the inclusion of this new stress, the predictions of turbulent kinetic energy (k +) in drag reducing pipe flow are significantly improved at the cost of a slight deterioration in the prediction of other quantities for some of the fluids. The value of the coefficient C in the original model of Cruz and Pinho was also modified to correct a mistake and this was shown to improve the predictions for all fluids except for the solution of 0.125% PAA used to calibrate the model. Comparison of predictions with DNS results for a FENE-P model showed large overprediction of drag reduction and emphasize the need for improvements in extensional rheometry.

Journal of Non-newtonian Fluid Mechanics, 2004

International Journal of Heat and Fluid Flow, 2006