Appl Thermodynamics I
Appl Thermodynamics I MET 325
Purdue University Calumet
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This 0 page Class Notes was uploaded by Rowland Purdy on Sunday November 1, 2015. The Class Notes belongs to MET 325 at Purdue University Calumet taught by Staff in Fall. Since its upload, it has received 8 views. For similar materials see /class/232690/met-325-purdue-university-calumet in Mechanical Engineering at Purdue University Calumet.
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Date Created: 11/01/15
Thermodynamics 7 study of energy heat work properties of the media exploded and processes involved Science of heat energy how heat engines work Free body diagram 7 Sketch of a body with ALL external forces acting on it Cantilever beam Thermodynamic system 7 Matter with fixed mass and identify separated from the surroundings by system boundaries Boundaries can be xed or moveable Energy can be transferred to or form or stored in system Properties of a system External measurable characteristics Examples temp pressure volume position State of a system condition of a system including energy content etc Properties determine state of system When the properties of a system are the same at different times the state of the system is the same at different times If properties change there is a different state Change in properties do not depend on how we accomplish the change Calc Review Differentiate Integration Extensive Propertie 7 depend on size amp total mass of system Intensive Propertie 7 Independent of system size temp amp pressure Specific Propertie 7 Given per unit mass small letters Total Volume 7 Specific volume Vm Temperatur 7 Measure of the random motion of molecules Average temp of the molecules in the neighborhood of a point Thermal Eguilibrium 7 No noticeable change in properties occur 9 mix inert gases 7 no change Zeroth Law of Thermodynomics 7 Two systems having equal temp with a third also have equal temp with each other Or if two bodies are in thermal equilibrium with a third they are in thermal equilibrium with each other EX Thermometers Temperature System 7 C F 32 F2 C32 9 9 Absolute Temperature Systems Rankine R F 460 Kelvin K C 273 Cool gas to 0 volume absolute 0 temp Temperature Measurement Methods 1 Expansion of gages liquids solids 7 Thermometer 2 Change in electrical resistance 7 Resistance Thermometer 3 Change in electrical potential 7 Thermocouple 4 Optical sensors 7 Optical pyrometer Chapter 1 7 Due Monday 12907 Force amp Mass English system US Customary Units Base Units Length Time force Derived Units Mass SI System Base Units Length Time Mass Derived Units Force Mass Quantity of matter or inertia a body has in resisting acceleration From Newton Law of Universal Gravitation F cx may or F K m 2 Second law of motion F cx ma or F gc Two ways to de ne force For English system De ne l lbf as the force necessary to Give 1 lbm an acceleration of 3217 ftsAZ So FEE w go go gc 3217 ftlbmlbf sA2 Constent g acceleration of gravity varies w elevation at second level 1 lbm weighs 1 lbf In SI gcl EXAMPLES Problem 143 50 mzlesx5380ft 1hr 3 ft hr mile 3600sec 39sec Problem 150 500 R gt C F R 460 5 5 C 30F 32 340 32 44 C 500 K gt C C K 273 500 273 227 C 650 F gt C F R 460 190 F C 3617 32 119 32 877 C Problem 158 M5kg gap 109806 2 980612 S S 5kg9806 32 S 4 W 903k g2 go 1 ms W 4903N Problem 169 fJ llbf GivenMJ 31835Me 2 Je 1097Fe FezKoMezoMo FJ K M2M0Ubf J J llbfz k31835MeZM0 109742 W WFe2645 Fe 1be 3781bf 2645 B Kenitic Theory of gases Pressure ForceUnit area From Ideal gas laws we conclude 1 Pressure normal force per unit surface area from molecules colliding with walls Dependant on number of impacts per units time mass of particles velocity 2 Avogadro s Lawequal volumes of gases at same pressure amp temperature contain same number of particles 3 Temperature measure of the translational energy 4 Density massunit volume p m V 5 Speci c volume volumeunit mass v 1p 6 Speci c Weight Weight per unit volume y S g gc Pressure psi SI PA kPa or mPa m N mgs Z kg m2 m2 ms2 Atmospheric Pressure 1Atm 14696 psia 101325 kPa Pabs Patm Pgage Patm 7 Pvac PAGE 31 CALC pA dpA yAdH PA 9 dp ydh pggc dh jdpj fdh gtxlt Pr esure m hhight of uid column gc Phg 136gcmA3 13600 kgmA3 VACUUM 2 X 4 board pull 10 psi vacuum 2 X 4 X l44inA2ftA2 X lOibinAZ 115201b
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