Muhmmad Aidil (16DKA18F2049)

Muhmmad Aidil (16DKA18F2049)

Published on 5 November 2020
Transcript
00:01
FLUID MECHANICS
00:03
TOPIC 5 & 7
00:05
MUHAMMAD AIDIL BIN ABDUL BASSIT 16DKA18F2049
00:09
I'M HERE TO PRESENT ABOUT FLUID MECHANICS DCC5143 TOPIC 5 & 7
00:20
THE CONCEPT OF FLOW IN MOTION DUE TO PRESENCE OF SHEAR STRESS
00:22
A stress is defined as a force per unit area, acting on an infinitestimal surface element. Stresses have both magnitude (force per unit area) and direction, and the direction is relative to the surface on which stress acts. There are normal stresses and tangential stresses. Pressure is an example of a normal stress, and act inward, toward the surface,and perpendicular to the surface
00:27
THE BEHAVIOR OF FLUID IN PIPES
00:30
LAMINAR FLOW Laminar flow generally happens when dealing with small pipes and low flow velocities. In laminar flow the motion of the particles of fluid is very oderly with all particles moving in straight line parallel to the pipe walls. TURBULENT FLOW In turbulent flow vorticles and wakes make th eflow unpredictable. Turbulent flow happens in general at high flow rates and with larger pipes. TRANSITIONAL FLOW Transitional flow is a mixture of laminar and turbulent flow, with turbulence in the center of the pipe, and laminar flow near the edges. Each of these flows behave in different manners in terms of their frictional energy loss while flowing,and have different equations that predict their behavior.
00:35
THE ENERGY LOSSES AND MINOR LOSSES IN PIPE SYSTEM
00:37
The total energy lose in a pipe system is the sum of the major and minor losses. Minor losses occur due to a change in the magnitude of velocity. For a long pipeline, minor losses are small as compared to loss due to friction, which may be neglected without serious error. The minor losses of energy may be occur at the following places :
00:39
Entrance of pipe in a pipe Exit of pipe Sudden enlargement in a pipe Sudden contraction in a pipe Bend and pipe fittings
00:43
ENERGY LOSSES THAT OCCUR IN REAL PIPELINE
00:46
In real fluid flows, losses occur due to the resistance of the pipe walls and the fittings to this flow and lead to an irreversible transformation of the energy of the flowing fluid into heat.
00:47
Two forms of losses can be distinguished : losses due to friction and local losses
00:54
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