A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 4 ppt
A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 1 Part 3 pptx
... parallel, black, opaque plates transfer heat by radiation, as shown in Fig. 1. 18. Find T 2 . 1. 15 Four infinite, parallel, black, opaque plates transfer heat by radiation, as shown in Fig. 1. 19. ... electrical resistance heater, releasing 10 00 W/m 2 . Calculate (a) the heater temperature, (b) the heat transfer from the methanol to the heater, and (c) the heat transfer f...
Ngày tải lên: 07/08/2014, 10:20
A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 1 Part 4 potx
... with weather data to estimate heating and cooling loads [2.5]. 78 Heat conduction, thermal resistance, and the overall heat transfer coecient Đ2 .4 transfer coecient h e = h + h rad = 18 .44 W/m 2 K. ... = ∆T R t total = T ∞ 1 −T ∞ r 1 hA + 1 k p A p L + k s A s L + 1 hA and U = Q A T = 1 2 h + 1 k p L A p A + k s L A s A The approach illustrated in...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 1 Part 6 ppt
... multipass shell- and-tube heat exchangers and one-pass cross-flow exchangers. 11 9 a. F for a one-shell-pass, four, six-, tube-pass exchanger. b. F for a two-shell-pass, four or more tube-pass exchanger. Figure ... (Data provided by A. D. Krauss.) 12 4 Problems 13 1 3 .13 Air at 2 kg/s and 27 ◦ C and a stream of water at 1. 5 kg/s and 60 ◦ C each enter a heat exchanger. E...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 1 Part 9 ppt
... 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...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 1 doc
... [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 (...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 3 pot
... = 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
A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 4 ppt
... 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...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 5 pptx
... 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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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 6 pptx
... 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...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 8 docx
... 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]...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 9 pdf
... 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...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 10 pptx
... 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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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 3 Part 4 potx
... The geometrical mean beam length is defined as L 0 ≡ 4 (volume of gas) boundary area that is irradiated (10. 54) Thus, for two infinite parallel plates a distance apart, L 0 = 4A / 2A = 2. Some other values ... net heat transfer is calculated using the surface area of the wall: Q net g-w = A w g T 4 g g T 4 w = (0 .4) (5.67 ì 10 8 ) (0.098)( 14 73) 4 (0.12)(5 73) 4...
Ngày tải lên: 07/08/2014, 10:20