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Modes of Work Transfer P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Development of Power for Different Needs!!!

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Negative Work When a system does positive work, its surroundings do an equal quantity of negative work. Conversely, when surroundings do positive work, the system does and equal quantity of negative work.

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Types of Work Transfers Moving Boundary work (displacement work) Electrical work Shaft work Flowing fluid work

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Moving Boundary work (displacement work) Boundary work occurs when a change in the system causes a force to act on the boundary and make it move.

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Simple Processes for Displacement Work : Control Mass

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Control Mass : Constant Volume & Pressure Processes

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Isothermal Process by A Control Mass

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Isothermal Process of Real Gases in a Control Mass Van der Waals EOS

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Displacement Work done by Superheated Steam During An Isothermal Process

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Generalized Process in A Control Mass p = p 0 + k (V-V 0 ) p 2 = p 0 2 + k (V-V 0 ) 2 Polytropic Nature of Fluid Process: pV n = Constant –n: Polytropic constant. –n=0 : Constant Pressure Process. –n= : Constant Volume Process.

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The Polytropic Process by A Control Mass One in which the pressure-volume relation is given as PV n =constant n may have any value from minus to plus infinity. Work transfer during a polytropic process.

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For a vapour under going a polytropic process.

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