HW3_SOLUTIONS - ENU 4134 Homework Assignment #3 SOLUTIONS...

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Unformatted text preview: ENU 4134 Homework Assignment #3 SOLUTIONS Fall 2011 D. Schubring 1 Task 1. Void Fraction Correlations (16 points total) a. HEM (2 points) HEM = 1 1 + 1- x x v l (1) HEM = 1 1 + 1- . 07 . 07 144 528 (2) HEM = 0 . 216 = (3) b. Martinelli-Nelson (2 points) Read off chart: MN . 20 c. Armand and Treshev (2 points) AT = K (4) AT = [0 . 833 + 0 . 05ln(10 p )] (5) AT = [0 . 833 + 0 . 05ln(10 18 . 674)] . 216 (6) AT = 0 . 237 (7) Remark: AT > HEM = . This implies a slip ratio less than 1. This result is likely unphysical. d. Drift flux model (10 points), solving with each of the below sets of assumptions. Comment on the variability in { } you predict and how important flow regime is in this case. (a) Take C as 1.2; use the small bubbles correlation in Table 11-2. = 1 C 1 + 1- x x v l + V vj v xG (8) V vj = (1- ) n V (9) V = g ( l- v ) d 2 18 f (10) V = 9 . 81 (528- 144)0 . 001 2 18 6 . 25 10- 5 (11) V...
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HW3_SOLUTIONS - ENU 4134 Homework Assignment #3 SOLUTIONS...

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