Lecture 1: Introduction
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Fluid Mechanics
FLUID MECHANICS PROF. DR. METİN GÜNER COMPILER ANKARA UNIVERSITY FACULTY OF AGRICULTURE DEPARTMENT OF AGRICULTURAL MACHINERY AND TECHNOLOGIES ENGINEERING 1 1. INTRODUCTION Mechanics is the oldest physical science that deals with both stationary and moving bodies under the influence of forces. Mechanics is divided into three groups: a) Mechanics of rigid bodies, b) Mechanics of deformable bodies, c) Fluid mechanics Fluid mechanics deals with the behavior of fluids at rest (fluid statics) or in motion (fluid dynamics), and the interaction of fluids with solids or other fluids at the boundaries (Fig.1.1.). Fluid mechanics is the branch of physics which involves the study of fluids (liquids, gases, and plasmas) and the forces on them. Fluid mechanics can be divided into two. a)Fluid Statics b)Fluid Dynamics Fluid statics or hydrostatics is the branch of fluid mechanics that studies fluids at rest. It embraces the study of the conditions under which fluids are at rest in stable equilibrium Hydrostatics is fundamental to hydraulics, the engineering of equipment for storing, transporting and using fluids. Hydrostatics offers physical explanations for many phenomena of everyday life, such as why atmospheric pressure changes with altitude, why wood and oil float on water, and why the surface of water is always flat and horizontal whatever the shape of its container. Fluid dynamics is a subdiscipline of fluid mechanics that deals with fluid flow— the natural science of fluids (liquids and gases) in motion. It has several subdisciplines itself, including aerodynamics (the study of air and other gases in motion) and hydrodynamics (the study of liquids in motion). -
Fluid Mechanics
cen72367_fm.qxd 11/23/04 11:22 AM Page i FLUID MECHANICS FUNDAMENTALS AND APPLICATIONS cen72367_fm.qxd 11/23/04 11:22 AM Page ii McGRAW-HILL SERIES IN MECHANICAL ENGINEERING Alciatore and Histand: Introduction to Mechatronics and Measurement Systems Anderson: Computational Fluid Dynamics: The Basics with Applications Anderson: Fundamentals of Aerodynamics Anderson: Introduction to Flight Anderson: Modern Compressible Flow Barber: Intermediate Mechanics of Materials Beer/Johnston: Vector Mechanics for Engineers Beer/Johnston/DeWolf: Mechanics of Materials Borman and Ragland: Combustion Engineering Budynas: Advanced Strength and Applied Stress Analysis Çengel and Boles: Thermodynamics: An Engineering Approach Çengel and Cimbala: Fluid Mechanics: Fundamentals and Applications Çengel and Turner: Fundamentals of Thermal-Fluid Sciences Çengel: Heat Transfer: A Practical Approach Crespo da Silva: Intermediate Dynamics Dieter: Engineering Design: A Materials & Processing Approach Dieter: Mechanical Metallurgy Doebelin: Measurement Systems: Application & Design Dunn: Measurement & Data Analysis for Engineering & Science EDS, Inc.: I-DEAS Student Guide Hamrock/Jacobson/Schmid: Fundamentals of Machine Elements Henkel and Pense: Structure and Properties of Engineering Material Heywood: Internal Combustion Engine Fundamentals Holman: Experimental Methods for Engineers Holman: Heat Transfer Hsu: MEMS & Microsystems: Manufacture & Design Hutton: Fundamentals of Finite Element Analysis Kays/Crawford/Weigand: Convective Heat and Mass Transfer Kelly: Fundamentals -
Frictional Peeling and Adhesive Shells Suomi Ponce Heredia
Adhesion of thin structures : frictional peeling and adhesive shells Suomi Ponce Heredia To cite this version: Suomi Ponce Heredia. Adhesion of thin structures : frictional peeling and adhesive shells. Physics [physics]. Université Pierre et Marie Curie - Paris VI, 2015. English. NNT : 2015PA066550. tel- 01327267 HAL Id: tel-01327267 https://tel.archives-ouvertes.fr/tel-01327267 Submitted on 6 Jun 2016 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. THÈSE DE DOCTORAT DE L’UNIVERSITÉ PIERRE ET MARIE CURIE Spécialité : Physique École doctorale : «Physique en Île-de-France » réalisée Au Laboratoire de Physique et Mécanique des Milieux Hétérogènes présentée par Suomi PONCE HEREDIA pour obtenir le grade de : DOCTEUR DE L’UNIVERSITÉ PIERRE ET MARIE CURIE Sujet de la thèse : Adhesion of thin structures Frictional peeling and adhesive shells soutenue le 30 Novembre, 2015 devant le jury composé de : M. Etienne Barthel Examinateur M. José Bico Directeur de thèse M. Axel Buguin Examinateur Mme. Liliane Léger Rapporteure M. Benoît Roman Invité M. Loïc Vanel Rapporteur 1 Suomi PONCE HEREDIA 30 Novembre, 2015 Sujet : Adhesion of thin structures Frictional peeling and adhesive shells Résumé : Dans cette thèse, nous nous intéressons à l’adhésion d’élastomères sur des substrats rigides (interactions de van der Waals). -
Theoretical Studies of Non-Newtonian and Newtonian Fluid Flow Through Porous Media
Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory Title Theoretical Studies of Non-Newtonian and Newtonian Fluid Flow through Porous Media Permalink https://escholarship.org/uc/item/6zv599hc Author Wu, Y.S. Publication Date 1990-02-01 eScholarship.org Powered by the California Digital Library University of California Lawrence Berkeley Laboratory e UNIVERSITY OF CALIFORNIA EARTH SCIENCES DlVlSlON Theoretical Studies of Non-Newtonian and Newtonian Fluid Flow through Porous Media Y.-S. Wu (Ph.D. Thesis) February 1990 TWO-WEEK LOAN COPY This is a Library Circulating Copy which may be borrowed for two weeks. r- +. .zn Prepared for the U.S. Department of Energy under Contract Number DE-AC03-76SF00098. :0 DISCLAIMER I I This document was prepared as an account of work sponsored ' : by the United States Government. Neither the United States : ,Government nor any agency thereof, nor The Regents of the , I Univers~tyof California, nor any of their employees, makes any I warranty, express or implied, or assumes any legal liability or ~ : responsibility for the accuracy, completeness, or usefulness of t any ~nformation, apparatus, product, or process disclosed, or I represents that its use would not infringe privately owned rights. : Reference herein to any specific commercial products process, or I service by its trade name, trademark, manufacturer, or other- I wise, does not necessarily constitute or imply its endorsement, ' recommendation, or favoring by the United States Government , or any agency thereof, or The Regents of the University of Cali- , forma. The views and opinions of authors expressed herein do ' not necessarily state or reflect those of the United States : Government or any agency thereof or The Regents of the , Univers~tyof California and shall not be used for advertismg or I product endorsement purposes. -
Monday, July 26
USNCCM16 Technical Program (as of July 27, 2021) To find specific authors, use the search function in the pdf file. All times listed are in Central Daylight Saving Time. Monday, July 26 1 TS 1: MONDAY MORNING, JULY 26 10:00 AM 10:20 AM 10:40 AM 11:00 AM 11:20 AM Symposium Honoring J. Tinsley Oden's Monumental Contributions to Computational #M103 Mechanics, Chair(s): Romesh Batra Keynote presentation: On the Equivalence On the Coupling of Fiber-Reinforced Analysis and Between the Multiplicative Hyper-Elasto-Plasticity Classical and Non- Composites: Interface Application of and the Additive Hypo-Elasto-Plasticity Based on Local Models for Failures, Convergence Peridynamics to the Modified Kinetic Logarithmic Stress Rate Applications in Issues, and Sensitivity Fracture in Solids and Computational Analysis Granular Media Mechanics Jacob Fish*, Yang Jiao Serge Prudhomme*, Maryam Shakiba*, Prashant K Jha*, Patrick Diehl Reza Sepasdar Robert Lipton #M201 Imaging-Based Methods in Computational Medicine, Chair(s): Jessica Zhang Keynote presentation: Image-Based A PDE-Constrained Image-Based Polygonal Cardiac Motion Computational Modeling of Prostate Cancer Optimization Model for Lattices for Mechanical Estimation from Cine Growth to Assist Clinical Decision-Making the Material Transport Modeling of Biological Cardiac MR Images Control in Neurons Materials: 2D Based on Deformable Demonstrations Image Registration and Mesh Warping Guillermo Lorenzo*, Thomas J. R. Hughes, Angran Li*, Yongjie Di Liu, Chao Chen, Brian Wentz, Roshan Alessandro Reali, -
Fluid Inertia and End Effects in Rheometer Flows
FLUID INERTIA AND END EFFECTS IN RHEOMETER FLOWS by JASON PETER HUGHES B.Sc. (Hons) A thesis submitted to the University of Plymouth in partial fulfilment for the degree of DOCTOR OF PHILOSOPHY School of Mathematics and Statistics Faculty of Technology University of Plymouth April 1998 REFERENCE ONLY ItorriNe. 9oo365d39i Data 2 h SEP 1998 Class No.- Corrtl.No. 90 0365439 1 ACKNOWLEDGEMENTS I would like to thank my supervisors Dr. J.M. Davies, Prof. T.E.R. Jones and Dr. K. Golden for their continued support and guidance throughout the course of my studies. I also gratefully acknowledge the receipt of a H.E.F.C.E research studentship during the period of my research. AUTHORS DECLARATION At no time during the registration for the degree of Doctor of Philosophy has the author been registered for any other University award. This study was financed with the aid of a H.E.F.C.E studentship and carried out in collaboration with T.A. Instruments Ltd. Publications: 1. J.P. Hughes, T.E.R Jones, J.M. Davies, *End effects in concentric cylinder rheometry', Proc. 12"^ Int. Congress on Rheology, (1996) 391. 2. J.P. Hughes, J.M. Davies, T.E.R. Jones, ^Concentric cylinder end effects and fluid inertia effects in controlled stress rheometry, Part I: Numerical simulation', accepted for publication in J.N.N.F.M. Signed ...^.^Ms>3.\^^. Date Ik.lp.^.m FLUH) INERTIA AND END EFFECTS IN RHEOMETER FLOWS Jason Peter Hughes Abstract This thesis is concerned with the characterisation of the flow behaviour of inelastic and viscoelastic fluids in steady shear and oscillatory shear flows on commercially available rheometers. -
On Exact Solution of Unsteady MHD Flow of a Viscous Fluid in An
Rana et al. Boundary Value Problems 2014, 2014:146 http://www.boundaryvalueproblems.com/content/2014/1/146 R E S E A R C H Open Access On exact solution of unsteady MHD flow of a viscous fluid in an orthogonal rheometer Muhammad Afzal Rana1, Sadia Siddiqa2* and Saima Noor3 *Correspondence: [email protected] Abstract 2Department of Mathematics, COMSATS Institute of Information This paper studies the unsteady MHD flow of a viscous fluid in which each point of Technology, Attock, Pakistan the parallel planes are subject to the non-torsional oscillations in their own planes. Full list of author information is The streamlines at any given time are concentric circles. Exact solutions are obtained available at the end of the article and the loci of the centres of these concentric circles are discussed. It is shown that the motion so obtained gives three infinite sets of exact solutions in the geometry of an orthogonal rheometer in which the above non-torsional oscillations are superposed on the disks. These solutions reduce to a single unique solution when symmetric solutions are looked for. Some interesting special cases are also obtained from these solutions. Keywords: viscous fluid; MHD flow; orthogonal rheometer; eccentric rotation; exact solutions 1 Introduction Berker [] has defined the ‘pseudo plane motions’ of the first kind that: if the streamlines in a plane flow are contained in parallel planes but the velocity components are dependent on the coordinate normal to the planes. Berker [] has obtained a class of exact solutions to the Navier-Stokes equations belonging to the above type of flows. -
Rheology of Frictional Grains
Rheology of frictional grains Dissertation zur Erlangung des mathematisch-naturwissenschaftlichen Doktorgrades “Doctor rerum naturalium” der Georg-August-Universität Göttingen im Promotionsprogramm ProPhys der Georg-August University School of Science (GAUSS) vorgelegt von Matthias Grob aus Mühlhausen Göttingen, 2016 Betreuungsausschuss: • Prof. Dr. Annette Zippelius, Institut für Theoretische Physik, Georg-August-Universität Göttingen • Dr. Claus Heussinger, Institut für Theoretische Physik, Georg-August-Universität Göttingen Mitglieder der Prüfungskommission: • Referentin: Prof. Dr. Annette Zippelius, Institut für Theoretische Physik, Georg-August-Universität Göttingen • Korreferent: Prof. Dr. Reiner Kree, Institut für Theoretische Physik, Georg-August-Universität Göttingen Weitere Mitglieder der Prüfungskommission: • PD Dr. Timo Aspelmeier, Institut für Mathematische Stochastik, Georg-August-Universität Göttingen • Prof. Dr. Stephan Herminghaus, Dynamik Komplexer Fluide, Max-Planck-Institut für Dynamik und Selbstorganisation • Dr. Claus Heussinger, Institut für Theoretische Physik, Georg-August-Universität Göttingen • Prof. Cynthia A. Volkert, PhD, Institut für Materialphysik, Georg-August-Universität Göttingen Tag der mündlichen Prüfung: 09.08.2016 Zusammenfassung Diese Arbeit behandelt die Beschreibung des Fließens und des Blockierens von granularer Materie. Granulare Materie kann einen Verfestigungsübergang durch- laufen. Dieser wird Jamming genannt und ist maßgeblich durch vorliegende Spannungen sowie die Packungsdichte der Körner, -
Overview of Turbulent Shear Flows
Overview of turbulent shear flows Fabian Waleffe notes by Giulio Mariotti and John Platt revised by FW WHOI GFD Lecture 2 June 21, 2011 A brief review of basic concepts and folklore in shear turbulence. 1 Reynolds decomposition Experimental measurements show that turbulent flows can be decomposed into well-defined averages plus fluctuations, v = v¯ + v0. This is nicely illustrated in the Turbulence film available online at http://web.mit.edu/hml/ncfmf.html that was already mentioned in Lecture 1. In experiments, the average v¯ is often taken to be a time average since it is easier to measure the velocity at the same point for long times, while in theory it is usually an ensemble average | an average over many realizations of the same flow. For numerical simulations and mathematical analysis in simple geometries such as channels and pipes, the average is most easily defined as an average over the homogeneous or periodic directions. Given a velocity field v(x; y; z; t) we define a mean velocity for a shear flow with laminar flow U(y)^x by averaging over the directions (x; z) perpendicular to the shear direction y, 1 Z Lz=2 Z Lx=2 v¯ = lim v(x; y; z; t)dxdz = U(y; t)^x: (1) L ;L !1 x z LxLz −Lz=2 −Lx=2 The mean velocity is in the x direction because of incompressibility and the boundary conditions. In a pipe, the average would be over the streamwise and azimuthal (spanwise) direction and the mean would depend only on the radial distance to the pipe axis, and (possibly) time. -
Rheometry SLIT RHEOMETER
Rheometry SLIT RHEOMETER Figure 1: The Slit Rheometer. L > W h. ∆P Shear Stress σ(y) = y (8-30) L −∆P h Wall Shear Stress σ = −σ(y = h/2) = (8-31) w L 2 NEWTONIAN CASE 6Q Wall Shear Rateγ ˙ = −γ˙ (y = h/2) = (8-32) w h2w σ −∆P h3w Viscosity η = w = (8-33) γ˙ w L 12Q 1 Rheometry SLIT RHEOMETER NON-NEWTONIAN CASE Correction for the real wall shear rate is analogous to the Rabinowitch correction. 6Q 2 + β Wall Shear Rateγ ˙ = (8-34a) w h2w 3 d [log(6Q/h2w)] β = (8-34b) d [log(σw)] σ −∆P h3w Apparent Viscosity η = w = γ˙ w L 4Q(2 + β) NORMAL STRESS DIFFERENCE The normal stress difference N1 can be determined from the exit pressure Pe. dPe N1(γ ˙ w) = Pe + σw (8-45) dσw d(log Pe) N1(γ ˙ w) = Pe 1 + (8-46) d(log σw) These relations were calculated assuming straight parallel streamlines right up to the exit of the die. This assumption is not found to be valid in either experiment or computer simulation. 2 Rheometry SLIT RHEOMETER NORMAL STRESS DIFFERENCE dPe N1(γ ˙ w) = Pe + σw (8-45) dσw d(log Pe) N1(γ ˙ w) = Pe 1 + (8-46) d(log σw) Figure 2: Determination of the Exit Pressure. 3 Rheometry SLIT RHEOMETER NORMAL STRESS DIFFERENCE Figure 3: Comparison of First Normal Stress Difference Values for LDPE from Slit Rheometer Exit Pressure (filled symbols) and Cone&Plate (open symbols). The poor agreement indicates that the more work is needed in order to use exit pressures to measure normal stress differences. -
Guide to Rheological Nomenclature: Measurements in Ceramic Particulate Systems
NfST Nisr National institute of Standards and Technology Technology Administration, U.S. Department of Commerce NIST Special Publication 946 Guide to Rheological Nomenclature: Measurements in Ceramic Particulate Systems Vincent A. Hackley and Chiara F. Ferraris rhe National Institute of Standards and Technology was established in 1988 by Congress to "assist industry in the development of technology . needed to improve product quality, to modernize manufacturing processes, to ensure product reliability . and to facilitate rapid commercialization ... of products based on new scientific discoveries." NIST, originally founded as the National Bureau of Standards in 1901, works to strengthen U.S. industry's competitiveness; advance science and engineering; and improve public health, safety, and the environment. One of the agency's basic functions is to develop, maintain, and retain custody of the national standards of measurement, and provide the means and methods for comparing standards used in science, engineering, manufacturing, commerce, industry, and education with the standards adopted or recognized by the Federal Government. As an agency of the U.S. Commerce Department's Technology Administration, NIST conducts basic and applied research in the physical sciences and engineering, and develops measurement techniques, test methods, standards, and related services. The Institute does generic and precompetitive work on new and advanced technologies. NIST's research facilities are located at Gaithersburg, MD 20899, and at Boulder, CO 80303. -
Navier-Stokes-Equation
Math 613 * Fall 2018 * Victor Matveev Derivation of the Navier-Stokes Equation 1. Relationship between force (stress), stress tensor, and strain: Consider any sub-volume inside the fluid, with variable unit normal n to the surface of this sub-volume. Definition: Force per area at each point along the surface of this sub-volume is called the stress vector T. When fluid is not in motion, T is pointing parallel to the outward normal n, and its magnitude equals pressure p: T = p n. However, if there is shear flow, the two are not parallel to each other, so we need a marix (a tensor), called the stress-tensor , to express the force direction relative to the normal direction, defined as follows: T Tn or Tnkjjk As we will see below, σ is a symmetric matrix, so we can also write Tn or Tnkkjj The difference in directions of T and n is due to the non-diagonal “deviatoric” part of the stress tensor, jk, which makes the force deviate from the normal: jkp jk jk where p is the usual (scalar) pressure From general considerations, it is clear that the only source of such “skew” / ”deviatoric” force in fluid is the shear component of the flow, described by the shear (non-diagonal) part of the “strain rate” tensor e kj: 2 1 jk2ee jk mm jk where euujk j k k j (strain rate tensro) 3 2 Note: the funny construct 2/3 guarantees that the part of proportional to has a zero trace. The two terms above represent the most general (and the only possible) mathematical expression that depends on first-order velocity derivatives and is invariant under coordinate transformations like rotations.