Hydrodynamic lubrication nptel. NPTEL IITm
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Hydrodynamic lubrication nptel. 5. If there is a some lubricant, which Courses NPTEL STARS Coordinators NPTEL Testimonials Exam Schedule Help Videos More And whenever we talk about hydrodynamic lubrication or elastohydrodynamic lubrication, viscosity is going to play major role. Therefore in hydrodynamic lubrication hmin ן U0. 87. 6. graphite) is preferable choice. 8K views 4 years ago Viscous Fluid Flow Viscous Fluid Flow Course URL: https://onlinecourses. ac. Liquid lubrication is more common compared to gaseous lubrication. So, you can see that we can classify this fluid film lubrication as hydrodynamic, squeezed film, and hydrostatic. 15M subscribers Subscribed Modeling systems as hydrostatic, squeeze film and elasto-hydrodynamic lubrication will be studied as infinite and later finite structures. For more details on NPTEL visit http://nptel. Capillary Fluid (incompressible) Flow and Hydrodynamic Lubrication tutorial of Fundamentals of Industrial Oil Hydraulics and Pneumatics course by Prof Prof. This transition from static rest to dynamic, full-film lubrication is fundamental to Mechanical-Syllabus NPTEL - Free download as PDF File (. in Modeling systems as hydrostatic, squeeze film and elasto-hydrodynamic lubrication will be studied as infinite and later finite structures. in) Lecture 10 - Design Considerations for Hydrodynamic Lubrication Systems 1x Search within video (e. When two surfaces, containing viscous fluid in between, approach towards each other the viscosity of fluid resists this motion and builds fluid pressure to prevent contact between the surfaces. 4 Hydrostatic and Hydrodynamic Systems A hydrostatic system uses fluid pressure to transmit power. in Lecture 10 - Wear Analysis Lecture 11 - Lubrication and Lubricants Lecture 12 - Boundary Lubrication Lecture 13 - Lubrication Mechanisms Lecture 14 - Hydrodynamic Lubrication Lecture 15 - Lubricant Classifications Lecture 16 - Solid and Semi Solid Lubricants Lecture 17 - Liquid Lubricants Lecture 18 - Lubricant Additives Lecture 19 - Fluid Film Many times using only classical hydrodynamic lubrication theory predicts a negligible fluid film in contacts such as exist in rolling element bearings and gears, but on considering the influence of pressure on both elastic deformation and lubricant viscosity, a significant thickness becomes possible. Since a finite time is required to squeeze the viscous Lecture 10 - Wear Analysis Lecture 11 - Lubrication and Lubricants Lecture 12 - Boundary Lubrication Lecture 13 - Lubrication Mechanisms Lecture 14 - Hydrodynamic Lubrication Lecture 15 - Lubricant Classifications Lecture 16 - Solid and Semi Solid Lubricants Lecture 17 - Liquid Lubricants Lecture 18 - Lubricant Additives Lecture 19 - Fluid Film Modeling systems as hydrostatic, squeeze film and elasto-hydrodynamic lubrication will be studied as infinite and later finite structures. in) Micro fluidics by Prof. Chakraborty,Department of Mechanical Engineering,IIT Kharagpur. 5 is used. iitm. May 6, 2020 · Classical lubrication theory naturally assumes that a lubricating oil is a Newtonian fluid with a fixed viscosity, and that the bearings are elastic solids, which might bend under oil pressure or Lecture 14 - Hydrodynamic LubricationLecture 14 - Hydrodynamic Lubrication HomePrevious Under these unfavorable conditions, hydrodynamic pressure developed is inadequate to support the load and they operate under either mixed-film or boundary lubricated conditions as depicted in the Stribeck curve shown in Fig. The salient features of this type of motion can be understood from a study of slipper bearing (Fig. Squeeze is English word, meaning act of gripping and pressing firmly. This course will cover the derivation of Navier-Stokes equations, exact solutions for simplified configurations, creeping flows , Stokes’s first and second problems, laminar boundary layers, wall-bounded and free-shear Tribology by Dr. An attempt has been made to clear Tribology by Dr. Some of the questions address topics like the relationship between lubrication efficiency and safety/reliability, types of magnetic We can classify that lubrication theory based on these four basic characteristics 1 is hydrodynamic lubrication another is hydrostatic lubrication and then hydro magnetic lubrication, last 1 is thermodynamic lubrication. Lubrication makes relative motion between COURSE OUTLINE Tribology deals with design of fluid containment systems like seals and gasket, Lubrication of surfaces in relative motion to achieve reduced friction and wear. This lubrication regime is important for all lubrication regimes to understand because of its application in various mechanical components such as roller bearings, cam-tappet system, flexible seals, and bio-medical applications of human This course will cover the derivation of Navier-Stokes equations, exact solutions for simplified configurations, creeping flows , Stokes’s first and second problems, laminar boundary layers, wall-bounded and free-shear boundaries and hydrodynamic stability with an introduction to turbulence. 01/12/2017 NPTEL :: Mechanical Engineering - Tribology Module 5 : Fluid Film Lubrication Fluid Mechanics Concepts Fluid is defined as a substance that easily moves and changes its relative position without a separation from the bulk mass. Modeling systems as hydrostatic, squeeze film and elasto-hydrodynamic lubrication will be studied as infinite and later finite structures. As the name indicates we are going to combine thermal effects with hydrodynamic effects and find out the pressure distribution based on that. in In hydrodynamic lubrication, increase in viscosity increases load capacity but also increases friction and temperature (Eq. Theory of Hydrodynamic Lubrication Thin film of oil, confined between the interspace of moving parts, may acquire high pressures up to 100 MPa which is capable of supporting load and reducing friction. The journal bearing (Fig. For a vast majority of the surfaces encountered in nature Hydrodynamic Lubrication In subject area: Materials Science Hydrodynamic lubrication (HL) is defined as a lubrication method where a thick fluid film prevents direct contact between friction-coupled elements, enabling them to operate without measurable wear over extended periods. Introduction The lubrication regime that occurs due to the elastic deformation of the lubricated contacts is the elastohydrodynamic lubrication regime. in Elastohydrodynamic lubrication (EHL) is a mode of fluid-film lubrication in which hydrodynamic action is significantly enhanced by surface elastic deformation and lubricant viscosity increases due to high pressure. This slipper face Tribology by Dr. The structure of the bearing and the nature of fluid flow determine the loads that can be supported. S. 3) develops its force by the same action, except that the surfaces are curved. Symbols - (Including fundamentals of fluid flow, fluids etc. g: "acoustic", "hydraulics" or "friction") Speech Recogniser Status: Not Recognising Search and Play Video / Home Previous Next Lecture No. 27. Fluid includes all gases, liquids and easy flowing solids. Harish Hirani, Department of Mechanical Engineering, IIT Delhi. In hydrostatic lubrication external pressure is supplied to separate two surfaces, while relative velocity between two surfaces is used to generate liquid pressure between two surfaces. The slipper moves with a constant velocity U past the bearing plate. Fluid film lubrication is a generic term used for full film lubrication, in which solids surfaces are completely separated by fluid and wear is negligible. Basic Components, Symbols and Circuits Incompressible Fluids - Some Fundamental Properties Incompressible Fluid Flow related to Fluid Drive Capillary Fluid (incompressible) Flow and Hydrodynamic Lubrication Basis for Calculating Hydraulic Systems Different types of Valves - Features and Operations - I Definition of Hydrodynamic Lubrication (HL) Hydrodynamic lubrication is a term that defines a situation in which two rubbing surfaces are separated by a thin film of a lubricant. NPTEL____Mechanical_Engineering_-_Tribology - Free download as PDF File (. This document provides course details for two engineering courses: 1) Engineering Mechanics, which covers topics like statics, dynamics, friction, and vibrations through 16 modules. R. Elastohydrodynamic Lubrication – or EHL – is a lubrication regime (a type of hydrodynamic lubrication (HL)) in which significant elastic deformation of the surfaces takes place and it considerably alters the shape and thickness of the lubricant film in the contact. The theory is applied for capillary flow as well as to develop hydrodynamic lubrications theory in sliding contact bearing which include the slipper pad and the journal bearing lubrication. Modeling systems as hydrostatic squeeze film and Elasto-hydrodynamic lubrication will be studied as infinite and later Nov 11, 2012 · Tribology by Dr. COURSE OUTLINE Tribology deals with design of fluid containment systems like seals and gasket, Lubrication of surfaces in relative motion to achieve reduced friction and wear. NPTEL IITm NPTEL IITm Tribology by Dr. com NPTEL IITm NPTEL IITm COURSE OUTLINE Introduction to Hydraulic and Pneumatic Systems. txt) or read online for free. in Viscous fluid flow covers the fundamentals of fluid mechanics from an advanced point of view. . This slipper face The question comes, how lubrication really helps? It was earlier mentioned it reduces the friction it reduces the wear, but, in addition to that there are couple of more advantages of lubrication. in) Anyway, we will look into the hydrodynamic lubrications and the pressure field in case of capillary passage. In case of hydrodynamic, you can see it is a converging wedge shaped geometry and there is a applied load and it is having the tangential velocity. In Elastohydrodynamic lubrication we consider the viscosity thickening due to increase in pressure, which in turn increases the fluid pressure. (Refer Slide Time: 01:44). 2) Basic Thermodynamics, which covers thermodynamics relations, properties of pure substances and mixtures Lecture 5 - Capillary Fluid (incompressible) Flow and Hydrodynamic Lubrication 1x Search within video (e. in Mar 1, 2013 · This lecture from NPTel, Indian Institute of Technology, discusses the principles and applications of journal bearings. in The video is first part of topic "Mechanism of lubrication" and it includes mechanism of hydrodynamic lubrication also known as thick film lubrication in detail. Gas (air) lubricated and rolling contact type motions with deformation at contact will be studied as special systems. Basic Components. This course focusses largely on viscous flows in the incompressible regime. Maiti of IIT Kharagpur. This situation is often beneficial and lubrication is used to reduce friction and/or wear of rubbing solids with the aid of liquid (or semi-solid) lubricant. in) Modeling systems as hydrostatic, squeeze film and elasto-hydrodynamic lubrication will be studied as infinite and later finite structures. e. Fluid may be gas or liquid. in NPTEL IITm NPTEL IITm The analysis of a hydrodynamic lubrication problem with allowance for viscous heating and dissipation of thermal heat is commonly known as thermo-hydrodynamic lubrication. in Access NPTEL Online IIT Kanpur for advanced courses and resources in engineering, science, and technology. ) Hydraulic valves General Purpose+Servo valves + NPTEL IITm NPTEL IITm Tribology by Dr. In previous we have studied elasto hydrodynamic lubrication. C. pdf), Text File (. 5. in Question 8: In hydrodynamic lubrication the major source of friction is A. in) Theory of Hydrodynamic Lubrication Thin film of oil, confined between the interspace of moving parts, may acquire high pressures up to 100 MPa which is capable of supporting load and reducing friction. Question 17: In hydrodynamic lubrication minimum film thickness (hmin), a critical design criterion, is a function of : Nov 11, 2012 · Tribology by Dr. g: "acoustic", "hydraulics" or "friction") Speech Recogniser Status: Not Recognising Search and Play Video / Home Previous Next The Genesis and Mechanics of the Hydrodynamic Wedge in Journal Bearings Section 1: The Formation Sequence: From Static Contact to Dynamic Lift The formation of a load-bearing hydrodynamic wedge in a journal bearing is not an instantaneous event but a sequential process that traverses distinct physical regimes. Shearing of lubricant film. Here, we combine elastic NPTEL IITm VDOM Modeling systems as hydrostatic, squeeze film and elasto-hydrodynamic lubrication will be studied as infinite and later finite structures. (from nptel. Nov 11, 2012 · Tribology by Dr. The pump used in hydrostatic systems is Liquid lubrication is more common compared to gaseous lubrication. in) Nov 11, 2012 · Tribology by Dr. 58), therefore careful selection of viscosity is important. Today’s topic is thermo hydrodynamic lubrication. in/nocmore COURSE OUTLINE Tribology deals with design of fluid containment systems like seals and gasket, Lubrication of surfaces in relative motion to achieve reduced friction and wear. 2). Bearings operating in this regime have extensive metal-to-metal contact and partial hydrodynamic lubrication. We said many times it reduces the failure possibility due to the certain change in load certain, change in lubrication conditions, certain change in misalignment. in Tribology by Dr. Abrasion of tribo-surfaces due to free particles. May 6, 2020 · The development of EHL theory from its tentative beginnings is outlined, with an account of how Ertel explained its relation to Hertz contact theory. inmore Lecture 6 - Principles of Lubrication, types of Lubricants and their properties Lecture 7 - Lubrication regimes and film thickness calculations Lecture 8 - Mixed Lubrication Lecture 9 - Hydrodynamic Lubrication Theory Lecture 10 - Design Considerations for Hydrodynamic Lubrication Systems Lecture 11 - Elastohydrodynamic Lubrication 1. Question 17: In hydrodynamic lubrication minimum film thickness (hmin), a critical design criterion, is a function of : Subscribed 92 7. The system creates high pressure, and through a transmission line and a control element, this pressure drives an actuator (linear or rotational). Early methods of measuring the film thickness NPTEL __ Mechanical Engineering - Tribology2 - Free download as PDF File (. This document contains a list of 25 questions related to tribology, the branch of science pertaining to friction, wear, and lubrication. Modeling systems as hydrostatic squeeze film and Elasto-hydrodynamic lubrication will be studied as infinite and later Lecture No. Here, we combine elastic Lecture 10 - Wear Analysis Lecture 11 - Lubrication and Lubricants Lecture 12 - Boundary Lubrication Lecture 13 - Lubrication Mechanisms Lecture 14 - Hydrodynamic Lubrication Lecture 15 - Lubricant Classifications Lecture 16 - Solid and Semi Solid Lubricants Lecture 17 - Liquid Lubricants Lecture 18 - Lubricant Additives Lecture 19 - Fluid Film So, first let us classify the fluid film lubrication. Michell, works on the principles based on the theory of hydrodynamic lubrication . Modeling systems as hydrostatic, squeeze film and elasto-hydrodynamic lubrication will be studied as infinite and later Lecture -07 Lubrication regimes and film thickness calculations Lecture -08 Mixed Lubrication Lecture -09 Hydrodynamic lubrication theory Week 4: Data-Enabled Tribological approaches Lecture -10 Design considerations for hydrodynamic lubrication systems Four Types of Lubricant Regimes | Boundary | Mixed | Hydrodynamic | Elasto hydrodynamic Lubrication What are the main differences between grease and oil? Michell thrust bearing, named after A. And naturally, we need to choose proper lubricating oil having appropriate viscosity. in NPTEL IITm NPTEL IITm Lecture 26 - Thermo Hydrodynamic LubricationLecture 26 - Thermo Hydrodynamic Lubrication Home NPTEL IITm NPTEL IITm Effective full film (hydrodynamic) lubrication can be achieved by continously feeding lubricant (as pressure greater than ambient pressure) through oil groove arrangement as shown in Fig. The problems caused by the failure of the early numerical analysts to understand that the film thickness depends on only two variables are emphasised, and answers of the form H = F ( P , S ) given. nptel. N. Abrasion due to asperities on tribo-surfaces. In hydrostatic lubrication external pressure is supplied to However, there is very short span of EHL regime compare to hydrodynamic and mixed lubrication, therefore exact knowledge of operating conditions (which is often very difficult) is a must for EHL design. G. Hydrostatics deals with the mechanics of still fluids and uses the theory of equilibrium conditions in fluid. Nov 2, 2015 · mod-05 lec-05 Capillary Fluid (incompressible) Flow and Hydrodynamic Lubrication nptelhrd 2. Tribology by Dr. Film means an exceedingly thin layer or a thin covering. For more details on NPTEL visit http://nptel. Lecture 5 - Capillary Fluid (incompressible) Flow and Hydrodynamic Lubrication Due to fluid pressure two surfaces get separate and minimum fluid film exists. 4. B. It is important to consider the thermal effect because several lubricants show reduction in fluid viscosity on increasing temperature, which may reduce load carrying capacity Lecture 14 - Hydrodynamic LubricationLecture 14 - Hydrodynamic Lubrication HomePrevious Lecture 11 - Lubrication and Lubricants Lecture 12 - Boundary Lubrication Lecture 13 - Lubrication Mechanisms Lecture 14 - Hydrodynamic Lubrication Lecture 15 - Lubricant Classifications Lecture 16 - Solid and Semi Solid Lubricants Lecture 17 - Liquid Lubricants Lecture 14 - Hydrodynamic LubricationLecture 14 - Hydrodynamic Lubrication HomePrevious Lecture 14 - Hydrodynamic LubricationLecture 14 - Hydrodynamic Lubrication HomePrevious Lecture 26 - Thermo Hydrodynamic LubricationLecture 26 - Thermo Hydrodynamic Lubrication Home Lecture 14 - Hydrodynamic LubricationLecture 14 - Hydrodynamic Lubrication HomePrevious NPTEL IITm NPTEL IITm NPTEL IITm NPTEL IITm Lecture 9 - Hydrodynamic Lubrication TheoryNPTEL Video Course : NOC:Data-Enabled Tribological Engineering: From Experiments to Predictive Models Lecture 10 - Design Considerations for Hydrodynamic Lubrication Systems Lecture 14 - Hydrodynamic Lubrication Home Previous Next Thumbnails Acadooghostwriter. Hydrostatic and hydrodynamic lubrications are two mechanisms of liquid lubrications. This type of lubrication is termed as Squeeze Film Lubrication Mechanism. M. # 26 Thermo – Hydrodynamic Lubrication Welcome to twenty sixth lecture of video course on Tribology. in Due to such extreme operating conditions there is hardly any possibility of hydrodynamic lubrication, so grease mixed with solid lubricants (i. NPTEL Phase II :: Tribology Lecture 7 - Lubrication regimes and film thickness calculations Lecture 8 - Mixed Lubrication Lecture 9 - Hydrodynamic Lubrication Theory Tribology by Dr. qee3nmn7n9anatexsasqpgsqij7yxpgzeuavutvb72te