Modeling and simulation using OpenFOAM of biodiesel synthesis in structured microreactor

Sousa, Marcos R.P. de; Santana, Harrson Silva; Taranto, Osvaldir Pereira

doi:10.1016/j.ijmultiphaseflow.2020.103435

Cited by 11 publications

(5 citation statements)

References 34 publications

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“…Major drawbacks of commonly commercially used batch reactors for biodiesel production are long reaction time, low energy efficiency, problematic selectivity, slow response to change in process parameters, heat and mass transfer issues (especially with heterogeneous catalyst), etc. Some novel reactors, such as microchannel reactors, have been developed to achieve high mixing performance and improve mass transfer and, therefore, increase reaction yield [ 11 ]. Microreactors present microfluidic systems in which chemical reactions are performed in a controlled manner within a network of microchannels (widths and depths range from tens to hundreds of micrometers), where the fluid flow is laminar and mass and heat transfer are strongly enhanced [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Transesterification of Sunflower Oil over Waste Chicken Eggshell-Based Catalyst in a Microreactor: An Optimization Study

et al. 2021

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The statistical experimental design (DoE) and optimization (Response Surface Methodology combined with Box–Behnken design) of sunflower oil transesterification catalyzed by waste chicken eggshell-based catalyst were conducted in a custom-made microreactor at 60 °C. The catalyst was synthesized by the hydration–dehydration method and subsequent calcination at 600 °C. Comprehensive characterization of the obtained catalyst was conducted using: X-ray powder diffractometry (XRD), X-ray fluorescence (XRF), Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), N2 physisorption, and Hg-porosimetry. Structural, morphological, and textural results showed that the obtained catalyst exhibited high porosity and regular dispersity of plate-like CaO as an active species. The obtained optimal residence time, catalyst concentration, and methanol/oil volume ratio for the continuous reaction in microreactor were 10 min, 0.1 g g−1, and 3:1, respectively. The analysis of variance (ANOVA) showed that the obtained reduced quadratic model was adequate for experimental results fitting. The reaction in the microreactor was significantly intensified compared to a conventional batch reactor, as seen through the fatty acid methyl esters (FAMEs) content after 10 min, which was 51.2% and 18.6%, respectively.

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Section: Introductionmentioning

confidence: 99%

Transesterification of Sunflower Oil over Waste Chicken Eggshell-Based Catalyst in a Microreactor: An Optimization Study

et al. 2021

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“…Governing equations for FEF modeling include continuity equation, momentum equilibrium equation and phase fraction equation. Each equation of the two-phase incompressible laminar flow is written as follows [40]: Continuity equation:…”

Section: Volume Of Fluid Methodsmentioning

confidence: 99%

Modeling and evaluation of freeform extruded filament based on numerical simulation method for direct ink writing

Hassan

Arrieta‐Escobar

et al. 2022

Int J Adv Manuf Technol

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Direct ink writing (DIW) is an extrusion-based additive manufacturing (AM) technique. One of the required factors for printing quality in DIW is to extrude continuous and tubular freeform extruded filaments (FEF) with diameters close to the nozzle inner diameter. This paper established a simulation model of FEF with volume of fluid (VOF) method and then evaluated the FEF based on the simulation results. First, ink properties including density, surface tension coefficient and rheological properties were determined by properties tests. Then, the model of FEF was established using VOF simulation method with the software OpenFOAM and two evaluation indicators, mean diameter and stability, were proposed to evaluate the FEF. Two inks, a cellulose ink and a Nivea Crème, were used under three levels of piston velocity to verify the method universality for different inks and variable process parameters. The prediction accuracy of the established simulation model was verified as the relative error between simulation and experimental results of diameter was less than 10.22%. In this work, it was found that: (1) piston velocity needed to be set higher than a minimum value to overcome yield stress and surface tension to successfully extrude filaments; (2) mean diameter of FEF decreased while stability of FEF decreased firstly and then increased as piston velocity increased. The proposed model and evaluation indicators gave an accurate and effective framework to analyze effect of the piston velocity on FEF, characterize the ink printability and find suitable printable windows for process parameters in DIW.

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“…The governing equations for the numerical simulation include continuity equation, momentum equilibrium equation and phase fraction equation. Each equation is written as follows [32]:…”

Section: Volume Of Fluid Methodsmentioning

confidence: 99%

Numerical simulation and experimental validation of deposited corners of any angle in direct ink writing

Hassan

Siadat

et al. 2022

Int J Adv Manuf Technol

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Direct ink writing (DIW) belongs to material extrusion based additive manufacturing (MEAM) and the molding quality of deposited corners has an impact on the geometrical quality of three dimensional (3D) parts fabricated by DIW. To fully understand the DIW process and improve the geometrical quality of parts, numerical simulations have been widely used to model the DIW process. However, the previous research works for numerical simulation of deposited corners could only achieve the corner simulation under the condition of small angle and failed to realize corner simulation of any angel. Herein, we propose an improved numerical simulation of deposited corners of any angle based on the use of volume of fluid (VOF) method and validate the proposed numerical simulation experimentally. For this purpose, the numerical simulation is conducted through geometrical modeling, meshes generation and boundary conditions determination. In the numerical simulation, deposited corner is realized by constructing two calculation areas where two nozzle velocities with the corner angle as the velocity direction angle are applied on the substrates of two calculation areas. The effectiveness of the proposed numerical model is validated through corners deposition experiments using a commercially available microcrystalline wax (MW)-based ink in a DIW 3D printer as simulated results fit experimental results well. The current work demonstrates an effective approach for the prediction of the deposited corners of any angle in DIW based on numerical simulations.

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Modeling and simulation using OpenFOAM of biodiesel synthesis in structured microreactor

Cited by 11 publications

References 34 publications

Transesterification of Sunflower Oil over Waste Chicken Eggshell-Based Catalyst in a Microreactor: An Optimization Study

Transesterification of Sunflower Oil over Waste Chicken Eggshell-Based Catalyst in a Microreactor: An Optimization Study

Modeling and evaluation of freeform extruded filament based on numerical simulation method for direct ink writing

Numerical simulation and experimental validation of deposited corners of any angle in direct ink writing

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