9/29/20101Mass Conservation,Flow EnergyME 200Thermodynamics IL15Purdue University , Dr. Tim Pourpoint – [email protected]Lecture 15September 29th, 2010Flow going the “wrong” way out of a rocketmotor (Purdue University, M. Zucrow Labs).Last Lecture• Ideal gas properties• Internal energy and enthalpy depend only on temperature• Cp – Cv = R• Change in internal energyhih lME 2002• Change in enthalpy
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9/29/20102• Conservation of Mass• Flow EnergyTodayME 2003Mass Flow Rate• Amount of mass flowing through a cross section per unittime (kg/s)ˆAmV dAVVn• For most cases of practical interest– One‐dimensional flow i.e. properties vary in the bulk flowdirection only– Velocity and density almost constant across the cross‐sectionnnAME 2004avmρVA