Ponències/Comunicacions de congressoshttp://hdl.handle.net/2117/964882024-03-29T05:47:12Z2024-03-29T05:47:12ZCFD Studies of the convective heat transfer coefficients and pressure drops in geometries applied to water cooling channels of the crotch absorbers of ALBA synchrotron light sourceGrozavu, StefaniaRaush Alviach, Gustavo AdolfoCasas Bullich, JoanColldelram, CalesQuispe, Marcoshttp://hdl.handle.net/2117/3739302022-10-04T12:50:14Z2022-10-04T12:45:23ZCFD Studies of the convective heat transfer coefficients and pressure drops in geometries applied to water cooling channels of the crotch absorbers of ALBA synchrotron light source
Grozavu, Stefania; Raush Alviach, Gustavo Adolfo; Casas Bullich, Joan; Colldelram, Cales; Quispe, Marcos
Currently, the storage ring vacuum chambers of ALBA are protected by 156 crotch absorbers made of copper and Glidcop. After more than 10 years of operation as a thirdgeneration light source, the ALBA II project arose, aiming to transform this infrastructure into a fourth-generation synchrotron. This introduces new challenges in terms of the thermal and mechanical design of the future absorbers. The absorbers’ cooling channels consist of a set of 8-mmdiameter holes parallel to each other and drilled in the body of the absorbers. In each hole, there is a 6x1 mm stainless steel concentric inner tube coiled in spiral wires, whose aim is to enhance the heat transfer. The convective heat transfer coefficients used for the original design of the absorbers come from experimental correlations from the literature, and are applied as a global value for the whole system. In this work, Heat Transfer-Computational Fluid Dynamics (HT-CFD) studies of the convective heat transfer coefficients and pressure gradients in three different cooling channel geometries are carried out, aiming at leading the way of designing the cooling systems toward the CFD simulations rather than applying global experimental values. This information will be useful for the sizing of the new absorbers for the ALBA II project
2022-10-04T12:45:23ZGrozavu, StefaniaRaush Alviach, Gustavo AdolfoCasas Bullich, JoanColldelram, CalesQuispe, MarcosCurrently, the storage ring vacuum chambers of ALBA are protected by 156 crotch absorbers made of copper and Glidcop. After more than 10 years of operation as a thirdgeneration light source, the ALBA II project arose, aiming to transform this infrastructure into a fourth-generation synchrotron. This introduces new challenges in terms of the thermal and mechanical design of the future absorbers. The absorbers’ cooling channels consist of a set of 8-mmdiameter holes parallel to each other and drilled in the body of the absorbers. In each hole, there is a 6x1 mm stainless steel concentric inner tube coiled in spiral wires, whose aim is to enhance the heat transfer. The convective heat transfer coefficients used for the original design of the absorbers come from experimental correlations from the literature, and are applied as a global value for the whole system. In this work, Heat Transfer-Computational Fluid Dynamics (HT-CFD) studies of the convective heat transfer coefficients and pressure gradients in three different cooling channel geometries are carried out, aiming at leading the way of designing the cooling systems toward the CFD simulations rather than applying global experimental values. This information will be useful for the sizing of the new absorbers for the ALBA II projectGears or rotors-three approaches to design of working units of hydraulic machinesStryczek, JaroslawBednarczyk, S.Codina Macià, EstebanGámez Montero, Pedro JavierIvanovic, LozicaMatejic, Miloshttp://hdl.handle.net/2117/3293292023-09-10T14:00:16Z2020-09-29T08:20:12ZGears or rotors-three approaches to design of working units of hydraulic machines
Stryczek, Jaroslaw; Bednarczyk, S.; Codina Macià, Esteban; Gámez Montero, Pedro Javier; Ivanovic, Lozica; Matejic, Milos
The gerotor pump has many advantages over other hydraulic pumps, such as high reliability, compactness, lower noise in running conditions etc. Considering the increasingly stringent regulations in the field of environmental protection, one of the main goals in the industrial applications of gerotors is to improve their design by using light materials and optimize their performance. This paper will give an overview of modern research that focuses on improving the performance of gerotor pumps. A joint publication of three university centers, namely of Wroclaw, Terrassa and Kragujevac, presents their original approaches to the problem of designing gerotor and orbital systems. The presentations have been prepared in separate parts, but according to similar rules. The first part of the paper focuses on meshing between internal and external gear of gerotor. Analysis for both cases, moved axis and fixed axis, will be provided in accordance to their working characteristics and their application. The second part of the paper provides the design of a gerotor pump strikes a balance between volumetric efficiency, manufacturability and mechanical efficiency. The third part of the paper defines the methodology for selecting the best combination of geometric form parameters of the trochoidal gearing in relation to the reduction of contact stresses and improving other characteristics of the pump. All three parts provide manufacturing and application review in the fluid power machines. Paper concludes with presented theoretical and experimental review of the authors and their practice achievements
2020-09-29T08:20:12ZStryczek, JaroslawBednarczyk, S.Codina Macià, EstebanGámez Montero, Pedro JavierIvanovic, LozicaMatejic, MilosThe gerotor pump has many advantages over other hydraulic pumps, such as high reliability, compactness, lower noise in running conditions etc. Considering the increasingly stringent regulations in the field of environmental protection, one of the main goals in the industrial applications of gerotors is to improve their design by using light materials and optimize their performance. This paper will give an overview of modern research that focuses on improving the performance of gerotor pumps. A joint publication of three university centers, namely of Wroclaw, Terrassa and Kragujevac, presents their original approaches to the problem of designing gerotor and orbital systems. The presentations have been prepared in separate parts, but according to similar rules. The first part of the paper focuses on meshing between internal and external gear of gerotor. Analysis for both cases, moved axis and fixed axis, will be provided in accordance to their working characteristics and their application. The second part of the paper provides the design of a gerotor pump strikes a balance between volumetric efficiency, manufacturability and mechanical efficiency. The third part of the paper defines the methodology for selecting the best combination of geometric form parameters of the trochoidal gearing in relation to the reduction of contact stresses and improving other characteristics of the pump. All three parts provide manufacturing and application review in the fluid power machines. Paper concludes with presented theoretical and experimental review of the authors and their practice achievementsThree dimensional simulation of gerotor with deforming mesh by using OpenFOAMCastilla López, RobertoGámez Montero, Pedro JavierRaush Alviach, Gustavo AdolfoCodina Macià, Estebanhttp://hdl.handle.net/2117/1219992023-09-10T10:30:32Z2018-10-08T13:47:54ZThree dimensional simulation of gerotor with deforming mesh by using OpenFOAM
Castilla López, Roberto; Gámez Montero, Pedro Javier; Raush Alviach, Gustavo Adolfo; Codina Macià, Esteban
A new-born design and construction of a mini gerotor metering pump with trochoidal-teeth is presented. The technical innovation in this new-born design is to study the fluid dynamic effects of interteeth and lateral clearances by using OpenFOAM toolbox, an open source CFD software. This work is based on two critical aspects, the deforming of the mesh following the solid gears rotation, a complex interaction between mesh and gear profile surface that has to maintain a moderate quality of the mesh, and the simulation by means of a new boundary condition of the interteeth contact, reproducing actual contact points between the rotors. The posibility of contact point simulation by means of a proper mesh motion model is also suggested.
2018-10-08T13:47:54ZCastilla López, RobertoGámez Montero, Pedro JavierRaush Alviach, Gustavo AdolfoCodina Macià, EstebanA new-born design and construction of a mini gerotor metering pump with trochoidal-teeth is presented. The technical innovation in this new-born design is to study the fluid dynamic effects of interteeth and lateral clearances by using OpenFOAM toolbox, an open source CFD software. This work is based on two critical aspects, the deforming of the mesh following the solid gears rotation, a complex interaction between mesh and gear profile surface that has to maintain a moderate quality of the mesh, and the simulation by means of a new boundary condition of the interteeth contact, reproducing actual contact points between the rotors. The posibility of contact point simulation by means of a proper mesh motion model is also suggested.Numerical study in a mini trochoidal-gear pump with multi-meshing contact pointsGámez Montero, Pedro JavierCastilla López, RobertoBuza Barambones, AlexisKhamashta Shahin, Munir AndrawesCodina Macià, Estebanhttp://hdl.handle.net/2117/966222023-09-10T01:37:25Z2016-11-14T14:38:07ZNumerical study in a mini trochoidal-gear pump with multi-meshing contact points
Gámez Montero, Pedro Javier; Castilla López, Roberto; Buza Barambones, Alexis; Khamashta Shahin, Munir Andrawes; Codina Macià, Esteban
A numerical study in a mini trochoidal-gear pump based on an ingenious strategy to adapt the background mesh to the profiles shape and a new boundary condition is presented. The strategy achieves a final background mesh better adapted to the geometries and, additionally, the cells are more homogenous and less distorted when the trochodial-profiles are moved. The new boundary condition to simulate the multi-meshing contact points is applied at every time step by means of the viscous wall approach, a home-made ad-hoc code, which has been integrated in an OpenFOAM solver that also includes the dynamic mesh functionality by deforming the mesh following the trochoidal-gear rotation. The presented numerical study establishes the basis that will allow simulating more realistic aspects of a new design of a mini trochoidal-gear pump once the need for a continuous fluid domain is overcome reproducing actual contacts between the rotors and will guide to a better understanding of the new design.
2016-11-14T14:38:07ZGámez Montero, Pedro JavierCastilla López, RobertoBuza Barambones, AlexisKhamashta Shahin, Munir AndrawesCodina Macià, EstebanA numerical study in a mini trochoidal-gear pump based on an ingenious strategy to adapt the background mesh to the profiles shape and a new boundary condition is presented. The strategy achieves a final background mesh better adapted to the geometries and, additionally, the cells are more homogenous and less distorted when the trochodial-profiles are moved. The new boundary condition to simulate the multi-meshing contact points is applied at every time step by means of the viscous wall approach, a home-made ad-hoc code, which has been integrated in an OpenFOAM solver that also includes the dynamic mesh functionality by deforming the mesh following the trochoidal-gear rotation. The presented numerical study establishes the basis that will allow simulating more realistic aspects of a new design of a mini trochoidal-gear pump once the need for a continuous fluid domain is overcome reproducing actual contacts between the rotors and will guide to a better understanding of the new design.Development of an app for compressible flow “App4Comp”Adam Alberdi, AndrésGámez Montero, Pedro Javierhttp://hdl.handle.net/2117/964872020-07-23T21:11:59Z2016-11-10T13:59:42ZDevelopment of an app for compressible flow “App4Comp”
Adam Alberdi, Andrés; Gámez Montero, Pedro Javier
In this paper is discussed the development and operation of a new Android App made through Google’s platform App Inventor 2. This App is focused on solving classic problems related to compressible flow, dealing with the typical cases seen in the subject of Fluid Mechanics of a degree in Aeronautics. It is downloadable from [1], or through the QR code at the end of this paper.
The main objective of this project was to bring in a new, useful app about compressible flow to the market, but also to test the platform App Inventor and see it usefulness in engineering applications.
2016-11-10T13:59:42ZAdam Alberdi, AndrésGámez Montero, Pedro JavierIn this paper is discussed the development and operation of a new Android App made through Google’s platform App Inventor 2. This App is focused on solving classic problems related to compressible flow, dealing with the typical cases seen in the subject of Fluid Mechanics of a degree in Aeronautics. It is downloadable from [1], or through the QR code at the end of this paper.
The main objective of this project was to bring in a new, useful app about compressible flow to the market, but also to test the platform App Inventor and see it usefulness in engineering applications.