HW3_FINAL

# HW3_FINAL - on the variability in α you predict and how...

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ENU 4134 – Homework Assignment #3 – Fall 2011 – D. Schubring 1 ENU 4134 – Homework Assignment #3 – Fall 2011 DUE: Friday, September 30 (to my mailbox in NSC 202, by close of business) ALLOWED COLLABORATION: You may discuss this assignment and the underlying con- cepts with your classmates, but your ﬁnal assignment must be yours alone and reﬂect your own understanding of the material. Consider the following conditions (vertical upﬂow): g = 9 . 81 m s - 2 (1) D = 1 cm (2) d = 1 mm (3) T sat = 360 C (4) P sat = 18 . 674 MPa (5) G = 1234 kg m - 2 s - 1 (6) x = 0 . 07 (7) dx dz = 0 . 2 m - 1 (8) ρ l = 528 kg m - 3 (9) ρ v = 144 kg m - 3 (10) μ l = 6 . 21 × 10 - 5 kg m - 1 s - 1 (11) μ v = 2 . 65 × 10 - 5 kg m - 1 s - 1 (12) Task 1. Void Fraction Correlations (16 points total) Compute { α } with the following methods: a. HEM (2 points) b. Martinelli-Nelson (2 points) c. Armand and Treshev (2 points) d. Drift ﬂux model (10 points), solving with each of the below sets of assumptions. Comment
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Unformatted text preview: on the variability in { α } 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. (b) Take C as 1.2; use the “slug ﬂow” correlation in Table 11-2. (c) Compute C from Dix’s model; use the “small bubbles” correlation in Table 11-2. (d) Compute C from Dix’s model; use the “slug ﬂow” correlation in Table 11-2. Task 2. SFM Pressure Drop (9 points) Calculating { α } as you did in Task 1-D-B, and taking φ 2 lo as 1.5, compute dp/dz SFM . Deliverable • Hard copy solutions/discussion, as required in the tasks above, with the tasks individually numbered (in order) and stapled. Do not include this assignment sheet. Do not include your UFID#....
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