SFM_exampleBOARD - ENU 4134 On-Board SFM Example D....

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Unformatted text preview: ENU 4134 On-Board SFM Example D. Schubring 1 Impact of slip model on the predicted void fraction adapted from T&K Problem 11-5 For the following conditions, compute the void fraction with the indicated models: m = 0 . 15 kg s- 1 (1) A = 1 cm 2 (2) x = 0 . 125 (3) T sat = 270 C (4) The liquid and vapor densities, along with pressure, need to be obtained using steam tables as: v = 28 . 1 kg m- 3 (5) f = 768 kg m- 3 (6) P sat = 5 . 505 MPa (7) a. HEM HEM implies S = 1. The equation for void fraction is then { } = 1 1 + 1- x x v l S (8) { } = 1 1 + 1- . 125 . 125 28 . 1 768 1 (9) { } = 0 . 796 (10) b. Martinelli-Nelson (Figure 11-17, page 497 youll need to interpolate between lines) (2 points) One needs to visually interpolate where a fine of 55.05 bar would appear, and then figure out where (on a semilog-x plot) 0.125 is. Your instructor estimates { } . 71, but theres about a 5% on this estimate. c. Bankoffs slip correlation ( i.e. , version of the drift flux model) { } is the same as { } HEM (0.796). This correlation then proceeds as: { } = K { } (11) { } = (0 . 71 + 0 . 0001 P abs ) . 796 (12) This pressure must be in psi for this equation to work. 5.505 MPa is equivalent to 800 psi.This pressure must be in psi for this equation to work....
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SFM_exampleBOARD - ENU 4134 On-Board SFM Example D....

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