Ignacio Carvajal-Mariscal
YOU?
Author Swipe
View article: Model-Free Identification of Heat Exchanger Dynamics Using Convolutional Neural Networks
Model-Free Identification of Heat Exchanger Dynamics Using Convolutional Neural Networks Open
Heat exchangers are widely used process equipment in industrial sectors, making the study of their temperature dynamics particularly appealing due to the nonlinearities involved. Model-free approaches enable the use of input and output dat…
View article: Adiabatic and No-Adiabatic Absorption Chillers Using Ammonia-Lithium Nitrate Solutions
Adiabatic and No-Adiabatic Absorption Chillers Using Ammonia-Lithium Nitrate Solutions Open
One of the applications of ammonia has been the use of this element as a refrigerant in air conditioning systems for buildings, process industries and residential homes. The high electrical consumption of conventional chillers is one of th…
View article: Formation of η-Carbides by Mechanical Alloying of Co25Mo25C50 and Their Performance in Hydrodesulfurization
Formation of η-Carbides by Mechanical Alloying of Co25Mo25C50 and Their Performance in Hydrodesulfurization Open
Cobalt–molybdenum η-carbides are attractive hydrodesulfurization (HDS) catalysts, yet controlling their phase composition and nanostructure remains challenging. Here, a Co25Mo25C50 powder was prepared by mechanical alloying in a horizontal…
View article: Thermal performance estimation and optimisation of a shallow geothermal compound heat pumping system for combined process heating and cooling
Thermal performance estimation and optimisation of a shallow geothermal compound heat pumping system for combined process heating and cooling Open
The present study proposes a unique thermal loop assembly, between a ground-source vapour compression cycle and an absorption heat pump, for combined heating and cooling production. The feasibility of the setup is conducted through a, data…
View article: Polyplacophoran Assemblages in Shallow Waters of the West Antarctic Peninsula: Patterns of Diversity, Composition and Abundance
Polyplacophoran Assemblages in Shallow Waters of the West Antarctic Peninsula: Patterns of Diversity, Composition and Abundance Open
For the first time, field surveys for exploring the diversity and composition of shallow-water polyplacophorans in West Antarctica have been conducted. During the austral summer sampling campaigns of 2022, 2023 and 2024, a total of 1717 sp…
View article: Computer Science Techniques Applied to Temperature Control in Biodiesel Production: Mathematical Modeling, Optimization, and Sensorless Technique
Computer Science Techniques Applied to Temperature Control in Biodiesel Production: Mathematical Modeling, Optimization, and Sensorless Technique Open
This paper demonstrates that biodiesel production processes can be optimized through implementing a controller based on fuzzy logic and neural networks. The system dynamics are identified utilizing convolutional neural networks, enabling t…
View article: Improvement Efficiency and Emission Reduction in Used Cars for Developing Regions Using Gasoline–Bioethanol Blends
Improvement Efficiency and Emission Reduction in Used Cars for Developing Regions Using Gasoline–Bioethanol Blends Open
Energy demand is continuously increasing owing to rapid technological developments and population growth. Additionally, it has been shown that the consumption of fossil fuels contributes to the emission of gases that increase the greenhous…
View article: Novel validity indices for dynamic clustering and an Improved Dynamic Fuzzy C-Means
Novel validity indices for dynamic clustering and an Improved Dynamic Fuzzy C-Means Open
Dynamic clustering algorithms play a crucial role in numerous real-world applications by continuously adapting to evolving data patterns and identifying changes within the underlying cluster structure. However, unlike static clustering, wh…
View article: Pulsatile Flow in Elastic Pipes: An Experimental Study
Pulsatile Flow in Elastic Pipes: An Experimental Study Open
This article examines experiments with elastic material, specifically the deformation of an elastic tube under hydrostatic pressure with a constant flow of fluid inside. This flow induces a pulsatile movement within the elastic tube. Preli…
View article: CFD Turbulence Models Assessment for the Cavitation Phenomenon in a Rectangular Profile Venturi Tube
CFD Turbulence Models Assessment for the Cavitation Phenomenon in a Rectangular Profile Venturi Tube Open
This study investigates cavitation in a rectangular-profile Venturi tube using numerical simulations and four turbulence models. The unsteady Reynolds-averaged Navier–Stokes technique is employed to simulate vapor cloud formation and compa…
View article: SPH simulations and experimental investigation of water flow through a Venturi meter of rectangular cross-section
SPH simulations and experimental investigation of water flow through a Venturi meter of rectangular cross-section Open
The flow of water through a horizontal small-scale Venturi tube of rectangular cross-section is simulated using a modified version of the open-source code DualSPHysics, which is based on Smoothed Particle Hydrodynamics (SPH) methods. Water…
View article: Temperature Control of a Chemical Reactor Based on Neuro-Fuzzy Tuned with a Metaheuristic Technique to Improve Biodiesel Production
Temperature Control of a Chemical Reactor Based on Neuro-Fuzzy Tuned with a Metaheuristic Technique to Improve Biodiesel Production Open
This work deals with the problem of choosing a controller for the production of biodiesel from the transesterification process through temperature control of the chemical reactor, from the point of view of automatic control, by considering…
View article: Numerical Evaluation of the Flow within a Rhomboid Tessellated Pipe Network with a 3 × 3 Allometric Branch Pattern for the Inlet and Outlet
Numerical Evaluation of the Flow within a Rhomboid Tessellated Pipe Network with a 3 × 3 Allometric Branch Pattern for the Inlet and Outlet Open
This study presents a comprehensive assessment of the hydrodynamic performance of a novel pipe network with tessellated geometry and allometric scales. Numerical simulations were used to evaluate flow behaviour and pressure drop. The compa…
View article: SPH simulations of water flow through a Venturi meter of rectangular cross-section: Comparison with experiments
SPH simulations of water flow through a Venturi meter of rectangular cross-section: Comparison with experiments Open
We present three-dimensional simulations of water flow through a horizon- tal, small-scale Venturi tube of rectangular cross-section at Reynolds numbers between 13272 and 33180, using the method of Smoothed Particle Hydrody- namics (SPH) f…
View article: Statistical analysis of observed Faraday wave patterns
Statistical analysis of observed Faraday wave patterns Open
We present experimental observations of Faraday wave patterns when a liquid in a square recipient is submitted to vertical vibrations with forcing frequencies and amplitudes in the intervals 10 ≤ F ≤ 80 Hz and 0.1 ≤ A ≤ 3 mm, respectively.…
View article: Virus-laden droplet nuclei in vortical structures associated with recirculation zones in indoor environments: A possible airborne transmission of SARS-CoV-2
Virus-laden droplet nuclei in vortical structures associated with recirculation zones in indoor environments: A possible airborne transmission of SARS-CoV-2 Open
Droplet nuclei dispersion patterns in indoor environments are reviewed from a physics view to explore the possibility of airborne transmission of SARS-CoV-2. This review analyzes works on particle dispersion patterns and their concentratio…
View article: Performance of DBD Actuator Models under Various Operating Parameters and Modifications to Improve Them
Performance of DBD Actuator Models under Various Operating Parameters and Modifications to Improve Them Open
Simulation is a valuable tool for the study of DBD actuators, therefore accurate, computationally efficient, and robust numerical models are required. The performance of three DBD actuator models was studied: the phenomenological Shyy and …
View article: Experimental assessment and semi empirical estimation of frost accretion—A case study on a spine-finned inverted-V tube array evaporator
Experimental assessment and semi empirical estimation of frost accretion—A case study on a spine-finned inverted-V tube array evaporator Open
Present work focuses on frost accretion in a spine-finned inverted-V tube array evaporator. An experimental evaluation was performed using a standard issue, vertical top-mount, 18 cubic feet, 0.5 m 3 , refrigerator. Evaporator temperature …
View article: Experimental study on the rise of aqueous foams in vertical pipes
Experimental study on the rise of aqueous foams in vertical pipes Open
In this paper we report experiments on the growth of dry foams and their rise in vertical pipes of different circular cross-sectional radii with length over diameter ratios in the interval 25 ≤ h / D ≤ 80 for applications in the study of f…
View article: Numerical Study of Water-Oil Two-Phase Flow Evolution in a Y-Junction Horizontal Pipeline
Numerical Study of Water-Oil Two-Phase Flow Evolution in a Y-Junction Horizontal Pipeline Open
The work aims to numerically evaluate different injection configurations for the analysis of a two-phase flow behavior and evolution through a staggered Y-junction pipeline. To minimize agglomeration between inlets, the injection zones hav…
View article: Le Maya Q’atzij/Our Maya Word: Poetics of Resistance in Guatemala.
Le Maya Q’atzij/Our Maya Word: Poetics of Resistance in Guatemala. Open
Review of the book Emil Keme's book Le Maya Q’atzij/Our Maya Word: Poetics of Resistance in Guatemala.
View article: Numerical Simulations of the Flow Dynamics in a Tube with Inclined Fins Using Open-Source Software
Numerical Simulations of the Flow Dynamics in a Tube with Inclined Fins Using Open-Source Software Open
Finned tubes increase the convective heat transfer in heat exchangers, reducing the total energy consumption of integrated industrial processes. Due to its stability and robustness, Computational Fluid Dynamics (CFD) commercial software is…
View article: Effect of Working Fluid-Filling Ratio Combination on Thermosyphon Performance as Add-In Enhancer for Indoor Air Conditioning Devices
Effect of Working Fluid-Filling Ratio Combination on Thermosyphon Performance as Add-In Enhancer for Indoor Air Conditioning Devices Open
An experimental study is presented to account for the implementation of a two-phase closed thermosyphon pipe, for energy-saving purposes, in air conditioning systems in the context of COVID-19. The experimental setup consisted of a 0.5 m ×…
View article: Experimental study on the rise of aqueous foams in vertical pipes
Experimental study on the rise of aqueous foams in vertical pipes Open
In this paper we report experiments on the growth of dry foams and their rise in thin vertical pipes of different circular cross-sectional radii. Air injection at the bottom of the pipes is performed at a constant flow rate by means of a s…
View article: Experimental Analysis of a Slab Continuous-Casting SEN with an Inner Flow Divider
Experimental Analysis of a Slab Continuous-Casting SEN with an Inner Flow Divider Open
In slab continuous-casting machines, the quality of the finished product mainly depends on the hydrodynamic behavior of the molten steel in the cavity of the continuous-casting mold, where the submerged entry nozzle is the central element.…
View article: Numerical Study of Multiphase Water–Glycerol Emulsification Process in a Y-Junction Horizontal Pipeline
Numerical Study of Multiphase Water–Glycerol Emulsification Process in a Y-Junction Horizontal Pipeline Open
This work aims to analyse different injection configurations for the analysis of the emulsification process in a Y-junction staggered horizontal pipeline. The case study comprises a multiphase analysis between two liquids, one with high an…
View article: Analysis of a New SEN Design with an Inner Flow Divider
Analysis of a New SEN Design with an Inner Flow Divider Open
To minimize the product imperfections due to slag entrapment and surface defects, the fluid flow pattern inside the mold must be symmetric, commonly named double-roll flow. Thus, the liquid steel must enter into the mold evenly distributed…
View article: Visualization and measurement of turbulent flow inside a SEN and off the ports
Visualization and measurement of turbulent flow inside a SEN and off the ports Open
This work describes a visualization technique that allows to register and analyze flow inside a Submerged Entry Nozzle (SEN) model. The internal flow has a swirling pattern that produces characteristic flow conditions that can be used in e…