P. J. Gamez-Montero

Bio: P. J. Gamez-Montero is an academic researcher from Polytechnic University of Catalonia. The author has contributed to research in topics: Gear pump & Gerotor. The author has an hindex of 15, co-authored 45 publications receiving 613 citations.

Particle dispersion processes in two-dimensional turbulence: a comparison with 2-D kinematic simulation.

Abstract: We study numerically the comparison between Lagrangian experiments on turbulent particle dispersion in 2-D turbulent flows performed, on the one hand, on the basis of direct numerical simulations (DNS) and, on the other hand, using kinematic simulations (KS). Eulerian space-time structure of both DNS and KS dynamics are not comparable, mostly due to the absence of strong coherent vortices and advection processes in the KS fields. The comparison allows to refine past studies about the contribution of non-homogeneous space-time 2-D Eulerian structure on the turbulent absolute and relative particle dispersion processes. We particularly focus our discussion on the Richardson's regime for relative dispersion.

Flipped learning and threshold concepts in the Turbomachinery section of Fluid Engineering course

Abstract: This paper outlines a practical intervention aiming to collect the effects of introducing flexible learning in engineering higher education. The work discusses the implementation of the flipped classroom method and the threshold concepts in the Turbomachinery section of Fluid Engineering course in the third year of Mechanical Engineering (Bachelor's degree) at the Universitat Politècnica de Catalunya. Fluid Engineering is traditionally one of the hardest courses involving a complex interaction between understanding concepts and using those concepts in the solution of cases, which also require the development of a set of skills. This case study is centred on two student cohorts, and the research spans over two consecutive Fall semesters. The study is based on sound pedagogy of educational technologies, in practice, frequent student‐to‐instructor interaction, academic results, and statistical and survey analyses. A principal conclusion is that overall class performance is much higher than that of the previous courses. The results indicate that learners gained understanding from semester to semester and no statistical significance was observed between group and exam format. Students were satisfied with the level of suitability and the degree of compliance of the new implementation and found it constructive in their learning process, an important educational benefit. This positive experience, in terms of benefit‐cost and outcomes, encourages the intervention without sacrificing any curriculum syllabus, but taking advantage and bringing the benefits of interactivity distance learning technologies and traditional face‐to‐face lectures. This scholarly research aims to contribute to this area, by abandoning traditional lecturing in favour of active learning.

Numerical study of the aerodynamics of sound sources in a bass-reflex port

Abstract: The aim of this paper is to study the aerodynamics phenomena of a bass-reflex port that causes noise in the audible frequency range. After discarding structural and mechanical vibration issues, the hypothesis considered is that vortex shedding is the source of the noise. Experimental and numerical evidences of the vortex, an analysis of its noise and the similarities between real and simulated performance are presented. The numerically simulated cases with the original geometry are excited at different frequencies and with modifications of the port geometry. Likewise, the internal performance of an enclosure with a closed port was simulated. The simulations have been performed with axisymmetrical geometries using the open-source OpenFOAM® toolbox. Moreover, experimental measurements were carried out. First, acoustic signal experiments were done to analyse the response of the bass-reflex ports. Secondly, a structure vibration measurement was conducted in order to exclude the cabinet structure vibra...

A simplified methodology to evaluate the design specifications of hydraulic components

Abstract: The fatigue of a hydraulic component inherently varies due to various factors that can be divided into two categories: structural and load spectrum variability. The effects of both variabilities must be considered when determining fatigue life. Compared with the structural variability, determining the variability in the load spectrums is more difficult because the service conditions are complicated and the measurements of the load parameters are slow and expensive. The problem that arises when studying the fatigue behaviour of such components is the transferability of short data samples from real-life load histories, which are application-dependant, to laboratory test methods. Derived from the experimental background and know-how of the authors, this paper proposes a methodology that allows the definition and establishment of the hydraulic cylinder design specificactions, while taking into account the probabilistic characterisation of the load spectrum variability. This methodology could be extrapolated to other hydraulic or mechanical components.

Pressure-Drop Coefficients for Cushioning System of Hydraulic Cylinder With Grooved Piston: A Computational Fluid Dynamic Simulation

Abstract: Cushioning is an important aspect in hydraulic cylinder performance. The piston has to be decelerated before it strikes the end cap in order to avoid stresses in the cylinder components and reduce vibration that can be transmitted to the machine. One of the least-studied methods is internal cushioning by grooves in the piston. In this method, the flow is throttled with adequately designed grooves when the piston reaches the outlet port position. The purpose of the present work is to present a method to estimate the pressure-drop coefficients for a certain design of piston grooves in order to provide a model to develop a dynamic system simulation of the cushion system. The method is based on a computational fluid dynamic simulation of flow through piston grooves to the outlet port for each piston’s static position. The results are compared with experimental measurements, and a correction, based on Reynolds number, is proposed. Good agreement, below 16%, was obtained for all the positions but particularly for the last grooves, for which the numerical result’s deviation to the experimental measurements was less than 10%. In general, the numerical simulation tended to underestimate the pressure drop for the first grooves and overestimate the calculation for the last grooves.

Seven Principles for Good Practice in Undergraduate Education: Faculty Inventory. Institutional Inventory.

Abstract: Arthur Chickering is Distinguished Professor of Higher Education at Memphis State University. On leave from the Directorship of the Center for the Study of Higher Education at Memphis State, he is Visiting Professor at George Mason University. Zelda Gamson is a sociologist who holds appointments at the John W. McCormack Institute of Public Affairs at the University of Massachusetts-Boston and in the Center for the Study of Higher and Postsecondary Education at the University of Michigan.

Principles Of Heat Transfer In Porous Media

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