Lec_1.pdf - ME 370A Thermodynamics Lecture 1 Summary • Thermodynamics is based on four conceptual quantities(mass momentum energy and entropy and on

Lec_1.pdf - ME 370A Thermodynamics Lecture 1 Summary •...

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ME 370A - Thermodynamics Lecture 1 - Summary • Thermodynamics is based on four conceptual quantities (mass, momentum, energy, and entropy) and on empirical statements about the behavior of matter, expressed in terms of these quantities, and called basic principles . Mass : a measure of the resistance to velocity change under an applied force. Momentum : a measure of the tendency of a system to move at a constant velocity; a measure of the time it takes for a system moving at a constant velocity to come to rest when under an applied force. Energy : a measure of the ability to do work or to cause change. Entropy : a measure of our uncertainty about the molecular state of a system. • In this course, we will express all of the basic principles in a common form, termed production accounting . We apply the production accounting form of the basic principles to two types of systems – a control mass (no mass crosses system boundaries) or a control volume . Time-interval basis: production ( ) = outflow ( ) - inflow ( ) + accumulation ( ) final ( ) - initial ( ) Rate basis: production rate ( ) = outflow rate ( ) - inflow rate ( ) + accumulation rate ( ) d( )/dt The basic principles are statements about the left-hand side of these equations. - production (M) = production rate (M) = 0 - production rate ( ) = 0, where ( ) - production (E) = production rate (E) = 0 - product (S) 0; production rate (S) 0 • Application of production accounting to a control mass (outflow (M) = inflow (M) = 0) - conservation of mass Þ production (M) = accumulation (M) = ∆M = 0 production rate (M) = accumulation rate (M) = 0, since no mass crosses system boundary -
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