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Unformatted text preview: • Fourier’s Law – heat transfer is Q-dot = k t A(ΔT/Δx) where k t is thermal conductivity • k t A(dT/dx) Convection – mostly in liquids, relies on the fact that particles could move • Q-dot = hA(T s- T ∞ ) where h is a huge function, A is surface Area Radiation – • Q-dot = ΕσA(T s- T ∞ ) Work – any energy crossing a system boundary that is not heat transfer o Forms of Work Flow work/flow energy • How much energy it takes to push it into the control volume o Pressure/density Mechanical energy – energy that can be converted to work if using a perfect turbine • e mech ≡ pressure/ρ + ke + pe o W = work W = W/m o W-dot = power = rate of work o Δw => integral of delta w from 1 to 2 is work o W = FΔx = integral Fdx from x1 to x2 w = integral F/A x Adx from x1 to x2 = integral of pdV from V to V Δx F p 1 p 2 2 t...
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- Fall '08