Mechanical energy balance_0919

Mechanical energy balance_0919 - Mechanical energy balance,...

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Mechanical energy balance, Bernoulli equation Energy balance for an open system For a steady flow system, energy of a process stream (J) includes internal energy ( ) Ei , potential energy ( = ) EPE mgz , kinetic energy ( = ) EkE mu22 , and pressure energy (PV). Total energy: = + + + E Ei PV EKE EPE i.e.: = + + + E Ei PV mu22 mgz Based on 1 st law of thermodynamics: = Ein Eout , + + + + = , + + + + Ei 1 P1V1 m2u12 mgz1 Q Ei 2 P2V2 m2u22 mgz2 W When expressed on a basis of unit mass: , + + + + = , + + + + Ei 1' P1ρ1 u122 gz1 Qm Ei 2' P2ρ2 u222 gz2 Wm Which is the general energy equation for a open system involving steady fluid flow: Qm : heat added to the fluid system per unit mass; Wm : work done per unit mass by the fluid system on its surroundings (such as a turbine). Ei : Internal : Flow Work (Pressure energy). The work required to move fluid across the control volume boundaries. u22
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This note was uploaded on 09/30/2011 for the course FDST 4050 taught by Professor Kong during the Fall '11 term at University of Georgia Athens.

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Mechanical energy balance_0919 - Mechanical energy balance,...

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