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PEDAGOGY OF ADVANCED FLUID MECHANICS

PEDAGOGY OF ADVANCED FLUID MECHANICS. P M V Subbarao Professor Mechanical Engineering Department I I T Delhi. Faster Ways to Develop Balancing Skills for Omni Present & Non Countable Systems ……. The Importance. The Fort of thermo-fluid sciences rests on three pillars: T hermodynamics,

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PEDAGOGY OF ADVANCED FLUID MECHANICS

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  1. PEDAGOGY OF ADVANCED FLUID MECHANICS P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Faster Ways to Develop Balancing Skills for Omni Present & Non Countable Systems ……

  2. The Importance • The Fort of thermo-fluid sciences rests on three pillars: • Thermodynamics, • Fluid mechanics, • Heat transfer. • Fluid mechanics’ principles are involved in open system thermodynamics processes. • They play a primary role in every convective heat transfer problem.

  3. A Superior Method of Problem Solving • A Pedagogy to turn a science student into engineering student. • The corner stone of this subject is introduction of the framework of conservation and accounting. • All Fluid Flows are Viscous in reality. • One need to Pay …… To sustain Fluid Flow. • Pragmatic way of learning & Usage of conservation laws. • Collection of some fundamental physical variables which naturally show the behavior of conservation and amicable for accounting. • Develop pseudo variables which can be cast into this frame work for better problem solving. (May be very difficult….!)

  4. In Modern Era • An Essential Engineering Science for All Thermo-fluid Processes. • A Novel Science created by applying of Laws of conservation to a Control Volume. • Creation of devices by manipulation of scalar & vector fields using a system of tensors. • Describes a class of Thermo-fluid systems.

  5. 21st Century Made Fluid Mechanics as Universal Engineering Tool.

  6. Fluid Flows in Transportation Sector

  7. Environmental Fluid Flows

  8. Weather & Fluid Flows

  9. Biological Fluid Flows

  10. Knowledge of Viscous Fluid Flow for Design of Artificial Heart Valves

  11. Fluid Flows for Sports

  12. Development of Fluid Flow Systems using a selected combination of Forces • Systems only due to Body Forces. • Systems due to only normal surface Forces. • Systems due to both normal and tangential surface Forces. • Only mechanical forces. • Only electrical forces. • Electro-kinetic forces. • Thermo-dynamic Effects (Buoyancy forces/surface )….. • Physico-Chemical/concentration based forces (Environmental /Bio Fluid Mechanics

  13. Major Flow Systems due to Mechanical Forces : Level 1 • Incompressible – A vector dominated….. • Compressible – Both vector and scalar ….

  14. 1930’s Flying StoryCruising at High Altitudes ?!?!?! • Aircraft were trying to approach high altitudes for a better fuel economy. • This led to numerous crashes for unknown reasons. • These included: • The rapidly increasing forces on the various surfaces, which led to the aircraft becoming difficult to control to the point where many suffered from powered flight into terrain when the pilot was unable to overcome the force on the control stick. • The Mitsubishi Zero was infamous for this problem, and several attempts to fix it only made the problem worse. • In the case of the Super-marine Spitfire, the wings suffered from low torsional stiffness.

  15. The P-38 Lightning suffered from a particularly dangerous interaction of the airflow between the wings and tail surfaces in the dive that made it difficult to "pull out“. • Flutter due to the formation of thin high pressure line on curved surfaces was another major problem, which led most famously to the breakup of de Havilland Swallow and death of its pilot, Geoffrey de Havilland, Jr.

  16. The Jet Plane Vampire • The first to exceed a speed of 500 miles per hour. • A total of 3,268 Vampires were built in 15 versions, including a twin-seat night fighter, trainer and a carrier-based aircraft designated Sea Vampire. • DH108 was a newer version was built and released for test. • Initially DH 108 behaved very nicely. • As the speed was stepped up in was unsuspectingly drawn closer to an invisible wall in the sky. • It was unknown to anyone. • One evening the pilot hit this wall and the plane was disappered.

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