CHEN 3101 Lecture Notes - Lecture 1: Opata Language, Inta, Energy Economics
25 Dec 2014
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B= boundary q = heat flux/area on boundary. Friction/viscosity (anything that converts mechanical energy into heat) Over short time (infinetesimal) dt, heat dq is transfered frp, 1 --> 2 dstot = ds1 + ds2 for any isolated system. Entropy increases, but each individual block can be treated as quasistaticbut then that doesn"t generate entropy. Entropy generation comes from heat flow down a t gradient in a film. Consider hypothetical quasistatic heating/cooling for each block (take each block individually) Entropy generation by dissipation joule device (simple than covette cell) viscous liquid. Chen thermo page 6 (some generation rate, but flows out to environment with heat flux) Change of s for ideal gas isothermal compression m tf, vi. For ideal gas for ideal gas, it"s always true that. Rather than calculate entropy for any state, let"s look at adiabatic compression/expansion. Heat flow: differential view q(x,t) = heat energy flux/(area*time) Imagine you have regional space w/ cross-sectional area a.
