ME200 - Lecture 151

ME200 - Lecture 151 - 9/29/2010 MassConservation,...

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9/29/2010 1 Mass Conservation, Flow Energy ME 200 Thermodynamics I Purdue University , Dr. Tim Pourpoint – [email protected] Lecture 15 September 29 th , 2010 Flow going the “wrong” way out of a rocket motor (Purdue University, M. Zucrow Labs). Last Lecture •Idea l gas properties •In te rna l energy and enthalpy depend only on temperature •Cp – Cv = R • Change in internal energy ME 200 2 •Change in enthalpy
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9/29/2010 2 • Conservation of Mass •F low Energy Today ME 200 3 Mass Flow Rate • Amount of mass flowing through a cross section per unit time (kg/s) ˆ A mV d AV V n  •Fo r most cases of practical interest –One dimensional flow i.e. properties vary in the bulk flow direction only –Ve lo c i ty and density almost constant across the cross section nn A ME 200 4 av m ρ VA
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9/29/2010 3 Mass Flow Rate ME 200 5 Figures from Cengel and Cimbala, Fluid Mechanics: Fundamentals and Applications Volume Flow Rate • Amount of volume flowing through a cross section per unit time (m 3 /s) VdA   VA V A  •Ma s s flow rate and volume flow rate related by specific volume . For uniform flow, perpendicular to control surface: n A av   av V r VV ME 200 6 vv VA mV A  
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9/29/2010 4 Comparison of velocity profiles for (a) laminar and (b) turbulent pipe flow The Laminar and Turbulent Pipe Flow turbulent pipe flow. The average velocity and the volumetric flow rate are the same for each profile. Figure
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This note was uploaded on 12/11/2011 for the course ME 200 taught by Professor Gal during the Fall '08 term at Purdue.

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ME200 - Lecture 151 - 9/29/2010 MassConservation,...

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