Fluids

This thesis studies a specific relationship between matter and form which can no longer be related to stability, solidity and objectuality, as it has been traditionally interpreted. To this aim, it firstly explores the plurivocity in the concepts of 'matter' and 'artistic material'; and secondly it examines a case study about water as a material presence in contemporary art. Over the course of the study, certain issues arise, such as the problematic use of notions like form, information and memory in the specific context of the artwork .

The  methodological lines of this thesis are an alternative approach to the artwork technical and material system, this understood as a synergistic and complex structure of symbolic, technological and imaginative relations. This methodology focuses on the evolution of the technical and technological thinking in the 20th century, establishing the connection between past and current uses of media and materials. Based on the principle of transversality, this study contributes to the expansion of the Third Culture by visualizing the dialogical relationship between art, science, technology and aesthetics. Thus, its starting point is the states of water (solid, liquid, and gas) as well as the technical and conceptual operations associated with this specific material. A selection of 258 artists or working groups and more than 500 works have been gathered along diverse actional and conceptual tendencies of water in its three states.

Archeology, technological thinking, anthropology, and material imagination are the key epistemological elements used to reflect on the encounter between the so-called traditional art mediums and new media in the 20th century —or from a broader perspective, between both the deterministic-mechanistic and the systemic-cybernetic currents of thought. In this context, water provides a paradoxical and exemplary temporal connectivity.

Resumen
La presente investigación tiene por objeto definir una zona muy poco tratada dentro de la historia del arte, en la que la relación entre materia y forma deja de poder aprehenderse como un fenómeno vinculado a los sentidos de estabilidad, solidez y objetualidad tal como se ha interpretado tradicionalmente. Para ello explora la plurivocidad de los sentidos de `materia´ y `material artístico´, confrontando esta perspectiva con el estudio del agua como presencia material en el arte contemporáneo, de lo que se derivan una serie de problemáticas respecto a los conceptos de forma, información, y por extensión memoria de la obra de arte.

Paralelamente se dibujan las líneas metodológicas de la semántica material como alternativa de aproximación al sistema técnico-material de la obra de arte, entendiendo éste como una estructura sinérgica y compleja de relaciones simbólicas, tecnológicas e imaginativas. La metodología propuesta pretende incidir en la evolución del pensamiento técnico y tecnológico del siglo XX, estableciendo puntos de conexión entre el uso actual de los medios y materiales artísticos, y sus antecedentes. Partiendo de la transversalidad, esta investigación se propone en última instancia contribuir a la expansión de la tercera cultura visibilizando las relaciones dialógicas entre creación artística, ciencia, tecnología y estética. Su puesta en práctica toma como punto de partida el agua en todos sus estados y las operaciones técnico-conceptuales asociadas a este material concreto. Una selección constituida por 258 artistas o grupos de trabajo y más de quinientas obras han sido recogidas en torno a las tendencias accionales y conceptuales del agua en sus estados sólido, líquido y gaseoso.

En definitiva, arqueología y antropología del pensamiento tecnológico e imaginación material son los elementos epistemológicos clave utilizados para reflexionar acerca de las cuestiones que definen el encuentro en el siglo XX entre los medios artísticos llamados tradicionales y los new media −o en un plano más amplio entre el pensamiento determinista-mecanicista y el sistémico-cibernético−, vehiculizadas por la paradójica conectividad temporal que ofrece el agua.

La investigación en el campo de las técnicas y materiales en el arte contemporáneo requiere la aplicación de nuevas metodologías transdisciplinares que permitan obtener una perspectiva renovada sobre los contenidos que entraña la amplia experimentación artística desarrollada en esta dirección durante el siglo  XX. El cambio de paradigma de la física y el progreso tecnológico han dado lugar a un caudal de nuevas narrativas posibles en las que se ha visto alterado profundamente el sentido tradicional de nociones como las de
materia
o
memoria
en el arte. La presencia material del agua en el arte de la segunda mitad del siglo  XX como objeto de estudio, nos permite proponer una metodología que revisa dichos conceptos a través del análisis de los planos imaginativo y técnico-operativo, así como afrontar los problemas que plantea a nivel teórico una estética de lo fluido.

Referencia completa:
MOÑIVAS, Esther. “Narrativas fluidas. El agua como presencia material en las artes plásticas contemporáneas” en: Dept. Història de l'Art i CEHA-Comité Español de Historiadores del Arte (coords.). CEHA, XVII Congrés Nacional d´História de l´art. Art i Memóri. [Actas]. Granada: Editorial Atrio, 2012, pp. 249-263.

In recent years, the use of dielectric spectroscopy as an investigation technique to determine the chemical–physical characteristics of biological materials has had a great increase. This study used the non-equilibrium thermodynamics with internal variables theory to test the potential pathological features of lung cancer. After a brief exploration of the dielectric polarization concept highlighting some aspects that were used, some thermodynamic functions were obtained as functions of the frequency, both for lung tumor cells and physiological ones. Variations in the intensity of values but not in the trend of the curves were observed and this was attributed to the perturbing field. The trend of this field explains the behavior of phenomena described by other functions, as related to the frequencies of the perturbing field. Compared to the physiological ones, the cancer cells appeared to be “more predisposed” to conserve their state as characterized by minor entropy production, prob...

The aeration of an oil film flowing between the faces of two closely spaced circular plates (one stationary, and one rotating) is examined experimentally, numerically, and with an improved lubrication model. The gap between the plates is small compared to their radii, making lubrication theory appropriate for modeling the flow. However, standard lubrication boundary conditions suggested by Reynolds (1886, "On the Theory of Lubrication and its Application to Mr. Beauchamp Tower’s Experiments, Including an Experimental Determination of the Viscosity of Olive Oil," Philos. Trans. R. Soc. London, 177, pp. 157-234) of p = 0 and pn = 0 (Dirichlet and Neumann conditions on pressure) at the gas-liquid interface do not allow for the inclusion of a contact line model, a phenomenon that is important in the inception of aeration. Hence, the standard theory does not adequately predict the experimentally observed onset of aeration. In the present work, we modify the Neumann boundary con...

Analytical expressions correlating the volumetric flow rate to the inlet and outlet pressures are derived for the time-independent flow of Newtonian fluids in cylindrically-shaped elastic tubes using a one-dimensional Navier-Stokes flow model with two pressure-area constitutive relations. These expressions for elastic tubes are the equivalent of Poiseuille and Poiseuille-type expressions for rigid tubes which were previously derived for the flow of Newtonian and non-Newtonian fluids under various flow conditions. Formulae and procedures for identifying the pressure field and tube geometric profile are also presented. The results are validated by a finite element method implementation. Sensible trends in the analytical and numerical results are observed and documented.

Passive methods using vortex generators (VGs) to enhance heat transfer have been a concern of researchers in recent decades. This study is intended to investigate the strength of the vortex generated by VGs by trying to reduce the pressure drop in the flow. The present work also takes into account the influence of the vortex intensity on the improvement of heat transfer, which can be indicated by the low value of the synergy angle. Experiments were carried out in the current investigation to validate the results of the numerical simulations in the Reynolds number range of 3102 to 16,132. The study results indicate that the observed heat transfer coefficients from the experimental and simulation results have a similar tendency with relatively small errors. A reduction in pressure drop is observed with the use of perforated concave rectangular winglets (PCRWs) against the nonperforated ones although there was a slight decrease in heat transfer improvements.

Study Objective: To determine whether intraoperative fluid management in spine surgery predicts postoperative intensive care unit length of stay (ICU LOS).Design: Retrospective case series.Setting: University-affiliated medical center.Patients: 103 adult ASA physical status I, II, and III patients undergoing spine surgery.Interventions: Patients were divided into three LOS groups: no ICU stay (LOS0) (n = 26), 1 day ICU stay (LOS1) (n

The European Union defined ambitious targets for the production of energy from renewable energy sources. Most European markets trade now high levels of variable renewable energy (VRE). Renewable generation increases the variability and uncertainty of the net-load (i.e., demand minus VRE). To a large extent, this variability and uncertainty can be compensated by hydroelectric power plants. Typically, hydro power producers (HPPs) consider the periods of time with low market prices (and normally low demand and/or high VRE production) to pump, and the periods with high market prices (and normally high demand and/or low VRE production) to produce energy. This article presents a model for hydro power plants and a study to analyse the hydro-wind balance in a real-world setting, namely a simplified version of the Portuguese power system, involving a significant penetration of hydro and wind power (more than 50%). The study is conducted with the help of the multi-agent system MATREM. The res...

The current project is a study of the Laplace equation that is used nowadays in many applications related to the electrical, magnetic, gravitational potentials, steady state temperatures, and in hydrodynamics.. The system corresponds to an elliptic second order partial differential equation and is widely used in the study of the inviscid incompressible potential flow in fluid mechanics. To solve this equation, numerical methods are used and different schemes are introduced to better control the solution through stability, accuracy and consistency. In what follows, a numerical study and investigation of the 2D Laplace Equation.

A common challenge faced by engineers in the hydraulic industry is the formation of free surface vortices at pump and power intakes. This undesirable phenomenon which sometimes entrains air could result in several operational problems: noise, vibration, cavitation, surging, structural damage to turbines and pumps, energy losses, efficiency losses, etc. This paper investigates the numerical simulation of an experimentally observed air-core vortex at an intake using the LTSInterFoam solver in OpenFOAM. The solver uses local time-stepping integration. In simulating the air-core vortex, the standard k − ε, realizable k − ε, renormalization group (RNG) k − ε and the shear stress transport (SST) k − ω models were used. The free surface was modelled using the volume of fluid (VOF) model. The simulation was validated using a set of analytical models and experimental data. The SST k − ω model provided the best results compared to the other turbulence models. The study was extended to simulat...

One of the most advantages of hybrid vehicles is that the wasted braking energy can be captured and reused during driving cycle. In this paper, a regenerative braking system for hydraulic hybrid vehicles is investigated. Based on Matlab/Simulink, the model ...

This paper considers the effect of heat transfer between fluid streams on the work output of a turbine. To correctly characterize the effect of heat transfer requires a new property, ‘mechanical work potential’, which is a measure of the maximum useful work that can be extracted from a fluid by an isentropic turbine exhausting to a fixed exit static pressure. A balance equation for the property, over a control volume, is developed. The equation shows that entropy creation through thermal mixing has no effect on turbine work. It does, however, show that a second heat transfer term, ‘thermal creation’, does alter turbine work. Thermal creation occurs in regions of the turbine where heat transfer occurs across a finite pressure difference. The term is the non-linear version of the acoustic energy creation term proposed by Lord Rayleigh in his thermo-acoustic criterion. The balance equation is then used to link local regions of thermal creation to changes in stage efficiency. The method is used to show that, in a modern high pressure turbine stage, heat transfer due to thermal mixing in the freestream causes a negligible change in efficiency and therefore can be ignored in the design process. The method is also used to show that heat transfer due to convective cooling results in ∼0.5% rise in stage efficiency. This is a significant and should be accounted for in the design process.Copyright © 2013 by ASME

During the fifteenth century the organic body politic metaphor was gradually associated or superseded by a physiological paradigm built on the ancient humoral theory. The new body politic, based on humours rather than on organs, eventually became a dynamic and fluid entity. Authors such as Nicole Oresme or Jean Gerson alleged that the etiology of humoral imbalance had its origins in growing social inequalities; Claude de Seyssel subsequently urged that the cure to restore the humoral balance should focus on creating new hope and bridges for the gifted. Seyssel was able to draw up his pioneering manifesto for social mobility thanks to the new physiological image of the civic body. The present study argues that such a physiological conception transformed anxiety about motion and disarray into a belief that social fluidity was indispensable to the well-being and health of the whole body, but the idea that (social) order and movements are not conflicting, was soon eradicated by new perspectives on nobility constructed on race and blood.

The Navier-Stokes differential equations describe the motion of fluids which are incompressible. The three-dimensional Navier-Stokes equations misbehave very badly although they are relatively simple-looking. The solutions could wind up being extremely unstable even with nice, smooth, reasonably harmless initial conditions. A mathematical understanding of the outrageous behaviour of these equations would dramatically alter the
field of fluid mechanics. This paper describes why the three-dimensional Navier-Stokes equations are not solvable, i.e., the equations cannot be used to model turbulence, which is
a three-dimensional phenomenon.

The ongoing and primary goal of the research is the pursuit of understanding of nonlinear processes in natural phenomena arising in optics and fluids. A considerable share of our attention is devoted to nonlinear optics, a relatively young subject, extremely rich in scientific and technological potential. While the studies focus on scientific questions connected with laser diode arrays, beam instabilities and the behavior of light beams at interfaces between nonlinear dielectrics, the technological ramifications and future opportunities are in many cases obvious. Optics also serves as a useful paradigm for gaining an increased understanding in other fields. For example, turbulence in optics, the study of the complex space-time filaments, patterns and defects which appear in feedback cavities and counterpropagating beams may be more analytically tractable than in other branches of continuous mechanics. There is little doubt that nonlinear optics is a subject in which interest is increasing.

En este libro de cálculo, hay dos opciones, la hoja 1 en la que introduce manualmente sus datos del sistema, fluido y tubería. No hay restricción y puede añadirle celdas de accesorios. Las gráficas la usa manualmente, por medio de flechas y puntos, para ubicar los tipos de bombas, o el tipo de flujo. En la hoja 2, ya es solo para acero cédula 40, pero le da inmediatamente los datos de ft, diámetro interior y rugosidad.

Fluidity is about materials in motion – materials active and activated, mobile and mobilised. It addresses processes of change, movement, and agency in a wide range of contexts and on diverse spatial-temporal scales: from local to global, molecular to infrastructural, natural to industrial, instantaneous and short-lived to creeping and geo-historical, from inorganic substances to living organisms.

Fluidity relates to intricate entanglements and far-reaching mixtures of actual materials rather than to a general flux of matter. Moreover, it involves rhetorical tropes, material imaginations, and theoretical challenges. Flows and circulations of materials are rarely smooth, uniform, frictionless, and free; instead, they are often messy, unsteady, viscous, turbulent or erosive, and sometimes disastrous.

This volume contributes to a critical cultural rheology examining the material complexities, epistemic functions, political ramifications, and ecological dimensions of fluidity

The incompressible couette flow problem given in the book " CFD basics and applications " by J.D.Anderson Jr. was taken up and Matlab code to solve the same was developed. The flow was resolved into a staggered grid and the momentum equations were used to generate the velocity fields and then the Poisson equation was solved to generate the pressure field. This was done iteratively till the solution converged.

Prinsloo, G.J. 2011. Inlet Air Flow Meter for an Internal Combustion Engine. Bachelor Engineering Thesis, Mechatronic Engineering, Stellenbosch University, South Africa. doi 10.13140/2.1.3010.4649.
This project focus on the design an Inlet Air Flow Meter for accurate measurement of mass flow rate of atmospheric air into an engine during engine dynamometer tests. The meter will be used to determine the air-fuel ratio and volumetric efficiency of the engine. To determine if an Inlet Air Flow Meter can be designed and constructed to be sufficiently accurate for dynamometer applications, while evaluating the potential for commercial use in high performance engine management systems. The Inlet Air Flow Meter will be used to evaluate new Biofuel formulations and their performance in internal combustion engines, for example non-edible vegetable oils extracted for fatty acid compositions and biodiesel production, and to evaluate the air flow characteristics, engine performance and emissions production of non-edible oils.