MECH 237 Study Guide - Midterm Guide: Thermodynamic Temperature, Clausius Theorem, Thermal Efficiency
29 Apr 2017
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Chapter 5: mass and energy analysis of control volumes. = a: where = the fluid density, v = average fluid velocity normal to a, and a = cross- sectional area normal to flow direction. The volume of the fluid flowing through a cross section per unit time is called the volume flow rate and is expressed as: = va = / : the work required to push a unit mass of fluid into or out of a control volume is called flow work or flow energy, and is expressed as wflow = pv. In the analysis of control volumes, it is convenient to combine the flow energy and internal energy into enthalpy. Then the total energy of a flowing fluid is expressed as: = h + ke + pe = h + + gz: the total energy transported by a flowing fluid of mass m with uniform properties is m .
