Boiling_Examples_3_4

Boiling_Examples_3_4 - Boiling Heat Transfer – Example...

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Unformatted text preview: Boiling Heat Transfer – Example 3 & 4 (Saturated Nucleate Boiling) – D. Schubring 1 Consider the following system: T sat = T bulk = 280 ◦ C (1) T wall = 285 ◦ C (2) P sat ≈ 6 . 419 MPa (3) D = 0 . 01 m (4) G = 1500 kg m- 2 s- 1 (5) x = 0 . 2 (6) Useful properties for both examples 3 and 4: ρ l = 751 kg m- 3 (7) ρ g = 33 . 2 kg m- 3 (8) μ l = 9 . 75 × 10- 5 kg m- 1 s- 1 (9) μ g = 1 . 87 × 10- 5 kg m- 1 s- 1 (10) Pr = 0 . 902 (11) h fg = 1 . 544 × 10 6 J kg- 1 (12) k l = 0 . 574 W m- 1 K- 1 (13) Example 3 Estimate q 00 using the simple correlations provided by Jens and Lottes and by Thom et al. Jens and Lottes: q 00 = exp 4 p 6 . 2 25 4 ( T w- T sat ) 4 (14) q 00 = exp 4 × 6 . 4191 6 . 2 25 4 (285- 280) 4 (15) q 00 = 0 . 101 MW m- 2 (16) q 00 = 1 . 01 × 10 5 W m- 2 (17) Thom et al. : q 00 = exp 2 p 8 . 7 22 . 7 4 ( T w- T sat ) 2 (18) q 00 = exp 2 × 6 . 4191 8 . 7 22 . 7 2 (285- 280) 2 (19) q 00 = 0 . 212 MW m- 2 (20) q 00 = 2 . 12 × 10 5 W m- 2 (21) Boiling Heat Transfer – Example 3 & 4 (Saturated Nucleate Boiling) – D. SchubringBoiling Heat Transfer – Example 3 & 4 (Saturated Nucleate Boiling) – D....
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Boiling_Examples_3_4 - Boiling Heat Transfer – Example...

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