Integral_Energy_Balance_web

Integral_Energy_Balance_web - ENU 4133 Integral...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
ENU 4133 – Integral Conservation of Energy January 25, 2011
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Applying Reynolds Transport to Energy For energy, B = E , β = dE / dm = e . Most general case (in scope of class) for this equation, stationary CV: dE dt = d dt ±Z CV e ρ d V ² + Z CS e ρ ³ ~ V · ~ n ´ dA (1) dE dt = dQ dt - dW dt (2) e = e internal + e kinetic + e potential + e other (3) e other this equation.
Background image of page 2
Heat and Work Terms dQ / dt is the primary focus of heat transfer texts; in this course, we’ll take it as an input, sometimes written as ˙ Q . Work term: dW dt = ˙ W = ˙ W shaft + ˙ W pressure + ˙ W viscous stress (4) ˙ W = ˙ W s + ˙ W p + ˙ W v (5) Work from gravity forces is in the potential energy term, e potential . Electromagnetic (etc.) forces are ignored. Shaft work: work from some machine, usually given in the problem.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Pressure and Viscous/Shear Work Terms Pressure work: d ˙ W p = - ( pdA ) V n , in = p ~ V · ~ ndA (6) ˙ W p = Z CS p ~ V · ~ ndA
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 8

Integral_Energy_Balance_web - ENU 4133 Integral...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online