A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 9 pdf

... 627 11 .6 Mass transfer at low rates 635 11 .7 Steady mass transfer with counterdiffusion 648 11 .8 Mass transfer coefficients at high rates of mass transfer . 654 11 .9 Simultaneous heat and mass transfer ... the right pass x Contents IV Thermal Radiation Heat Transfer 523 10 Radiative heat transfer 525 10 .1 The problem of radiative exchange 525 10 .2 Kirchhoff’s la...

Ngày tải lên: 07/08/2014, 10:20

... briefly at the dimensional analysis of transient con- duction in general and of lumped-capacity systems in particular. Dimensional analysis of transient heat conduction We first consider a fairly ... t/T can be viewed as t T = hk(V /A) t ρc(V /A) 2 k = h(V /A) k · αt (V /A) 2 = Bi Fo (5.7) Electrical and mechanical analogies to the lumped-thermal-capacity problem The term capacitance is...

Ngày tải lên: 07/08/2014, 10:20

... 0.7 910 3 1. 1 016 0.9903 1. 14897 1. 1724 0.9893 1. 43203 1. 2236 0.9904 0.90 0.82740 1. 110 7 0.9882 1. 20484 1. 1902 0.9869 1. 50442 1. 2488 0.9880 1. 00 0.86033 1. 119 1 0.98 61 1.25578 1. 20 71 0.9843 1. 57080 1. 2732 ... 0.94077 1. 114 3 0.9954 1. 16556 1. 14 41 0.9960 0.60 0.70507 1. 0 814 0.9940 1. 018 44 1. 1345 0.9936 1. 26440 1. 1 713 0.9944 0.70 0.75056...

Ngày tải lên: 07/08/2014, 10:20

... [5.6] 13 . Isothermal ellipsoid of semimajor axis b and semiminor axes a conducts heat into an infinite medium at T ∞ ; b> ;a( see 4) 4πb  1 a 2  b 2 tanh 1   1 a 2  b 2  meter [5 .16 ] 24 6 26 2 ... 5 .1 0a Φ 1 ( Fo 1 = 0.565, Bi 1 = 0 . 21 05 ) = 0 .10 Φ 2 ( Fo 2 = 0.565, Bi 2 = 0 . 21 05 ) = 0 .10 and, with eqn. (5.7 3a) , Φ = Φ 1 +Φ 2 (...

Ngày tải lên: 07/08/2014, 10:20

...  = 3 20 φ− 3 28 0 φ 3    = 3 2u ∞ (6. 52) Since φ is a constant for any Pr [recall eqn. (6.46)], we separate variables: 2 t dδ t dx = dδ 2 t dx = 3 /u ∞  3 20 φ − 3 28 0 φ 3  §6.5 Heat transfer ... 0.0 021 35 so τ yx = (0.0 021 35 ) 1 2 ρu 2 ∞ = (0.0 021 35 )(1.05)(15) 2 2 = 0 .25 22 kg/m·s 2 and the force is τ yx A = 0 .25 22( 0.5) 2 =...

Ngày tải lên: 07/08/2014, 10:20

... transitional value. Problems 335 6.31 A thin metal sheet separates air at 44 ◦ C, flowing at 48 m/s, from water at 4 ◦ C, flowing at 0.2m/s. Both fluids start at a leading edge and move in the same ... at 25 ◦ C flows at 0.7m/s over a 4 cm-long flat heater at 60 ◦ C. Find h, τ w , h(x = 0. 04 m), and δ(x = 0. 04 m). 6 .20 A large plate is at rest in water at 15 ◦ C. The plate i...

Ngày tải lên: 07/08/2014, 10:20

... and J. P. Hart- nett, editors, Advances in Heat Transfer, volume 6, pages 50 4 56 4. Academic Press, Inc., New York, 1970. [6.14] A. A. Žukauskas and A. B. Ambrazyavichyus. Heat transfer from a ... that of predicting laminar convection in a pipe. 7 .2 Heat transfer to and from laminar flows in pipes Not many industrial pipe flows are laminar, but laminar heating and cool- in...

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... fins of a heat exchanger may form a rect- angular passage through which air flows. Sometimes, the passage cross- section is very irregular, as might happen when fluid passes through a clearance between ... situations, but all must be viewed critically. Many are based on limited data, and many incorporate systematic errors of one kind or another. In the face of a heat transfer situa...

Ngày tải lên: 07/08/2014, 10:20

... by Fujii and Imura [8. 16], Vliet [8. 17], Pera and Gebhart [8. 18] , and Al-Arabi and El-Riedy [8. 19], among others. 8. 5 Film condensation 431 on the same basis. The integration of eqn. (8. 47) subject ... 434 Natural convection in single-phase fluids and during film condensation 8. 5 Figure 8. 12 Results of the exact b.l. analysis of laminar film condensation on a vertical plate [8. 36]...

Ngày tải lên: 07/08/2014, 10:20

... on natural convection heat transfer from a horizontal plates. Int. J. Heat Mass Transfer, 17(1):135–1 42, 197 4. 458 Heat transfer in boiling and other phase-change congurations 9. 1 Figure 9. 1 ... Natural convection heat transfer from a plate with arbitrary inclination. Int. J. Heat Mass Transfer, 15(4): 755–767, 19 72. [8.17] G. C. Vliet. Natural convection local...

Ngày tải lên: 07/08/2014, 10:20

... quite ac- curate and widely-used, semi-empirical equation for correlating surface 470 Heat transfer in boiling and other phase-change congurations Đ9 .2 Table 9 .2 Selected values of the surface ... 25 8 2. 80 25 5 2. 29 25 3 1.95 Isopropyl alcohol 10 to 100 22 .90 0.0789 Mercury 5 to 20 0 490.60 .20 49 Methane 90 18.877 100 16. 328 115 12. 371 Methyl alcohol 10 to 60 24...

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... 1 29 .3 304.4 1 096 35 0 231 5 895 .2 1 09. 0 112.5 30 4.1 1078 36 0 2 290 824.881. 891 .0 30 3.8 1054 37 3 2257 717.0 30 3 .3 1022 400 21 83 346 .9 30 2.4 94 5 500 1828 299 .2 39 1 600 11 73 295 .9 700 292 .3 T tp 2 73. 16 ... 8 ,95 4 38 4 39 8 11.57 4 83 420 401 39 1 38 9 38 4 37 8 36 6 35 2 33 6 DS-C15715 ∗ 8 ,90 0 38 4 36 5 ≈10.7 36 7 35 5 34 5 33 5 32 0...

Ngày tải lên: 07/08/2014, 10:20