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HW4_FINAL

# HW4_FINAL - ENU 4134 Homework Assignment#4 Fall 2011 D...

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ENU 4134 – Homework Assignment #4 – Fall 2011 – D. Schubring 1 ENU 4134 – Homework Assignment #4 – Fall 2011 DUE: Monday, October 17 ALLOWED COLLABORATION: This assignment may be completed in groups of up to 2, who may turn in one paper. Task 1. Liquid Superheat Required for Nucleation at Elevated Pressure – 5 points Repeat the computations of Boiling Example #1 for water at a saturation temperature of 250 C, using 20 μ m bubbles. Properties: P = 3 . 978 MPa (1) ρ g = 19 . 98 kg m - 3 (2) ρ f = 799 kg m - 3 (3) k f = 0 . 616 W m - 1 K - 1 (4) k g = 0 . 0495 W m - 1 K - 1 (5) Pr f = 0 . 859 (6) Pr g = 1 . 39 (7) h fg = 1 . 715 × 10 6 J kg - 1 (8) μ f = 1 . 087 × 10 - 4 kg m - 1 s - 1 (9) μ g = 1 . 751 × 10 - 5 kg m - 1 s - 1 (10) σ = 0 . 02619 N m - 1 (11) R = 461 . 5 J kg - 1 K - 1 (12) Task 2. Use of an Annular-Specific Correlation for htc boil – 5 points A two-phase mixture flows in a tube at a saturation temperature of 250 C. Given: x = 0 . 2 (13) D = 0 . 012 m (14) G = 1000 kg m - 2 s - 1 (15) q 00 = 7 . 5 × 10 5 W m - 2 (16) Compute T

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HW4_FINAL - ENU 4134 Homework Assignment#4 Fall 2011 D...

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