Questions & Answers II

State Bernoulli’s equation Bernoulli’s equation may be stated as ‘the sum of the kinetic energy (velocity head) and pressure energy (static head) and potential energy (elevation head) of an ideal, incompressible fluid is constant along a stream line’ What is Control volume and Control Surface? To solve problems in fluid mechanics, a fixed region is [...]

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Thermodynamic Properties of Fluid | Gas Laws

  Boyle’s Law: states that Pressure and volume are inversely proportional  when temperature kept constant i.e. P α 1/V Charles’s Law: states that Pressure varies directly with temperature if volume kept constant and volume varies with temperature if pressure kept constant. Combining the two laws, the Gas law emerged PV= RT, where R is gas constant.

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Properties of Fluid | Vapour Pressure

Vapour Pressure:  Pressure exerted by the vapour formed at the surface of a liquid is called vapour pressure. The phenomenon of vaporization is due to the surface molecules escaping the liquid by overcoming the molecular attractive forces by virtue of their translational momentum. Vapour pressure of a liquid increases with its temperature due to increased [...]

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Properties of Fluid | Capillarity, Bubbles and Liquid Jets

  The force due to surface tension is generally negligible in comparison with the pressure and gravitational forces but the same assumes predominance for narrow liquid columns such as those in capillary tubes, in bubble mechanics and liquid-jet studies for flow through porous substances. Capillary implies the rise or depression of the level of a liquid [...]

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Properties of Fluid | Surface Tension

  Surface tension is the property of the apparent tension effect which occurs at the interface of a liquid and a gas or at the interface of two immiscible liquids. The origin of surface tension is explained by considering the mechanism of cohesive forces within a liquid.

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