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 byradiation, as shown in Fig. 1. 18. Find T2. 1. 15 Four infinite, parallel, black, opaque plates transfer heat byradiation, as shown in Fig. 1. 19. ... electrical resistance heater,releasing 10 00 W/m2. Calculate (a) the heater temperature, (b)the heat transfer from the methanol to the heater, and (c) the heat transfer from the heater to the air. 1. 34 ... issued as class notes at the University of California atBerkeley between 19 32 and 19 41. [1. 3] M. Jakob. Heat Transfer. John Wiley & Sons, New York, 19 49. [1. 4] W. H. McAdams. Heat Transmission....
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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 he= h + hrad= 18 .44 W/m2K. ... =∆TRttotal=T∞ 1 −T∞r 1 hA+ 1 kp A pL+ks A sL+ 1 hAandU =Q A T= 1 2h+ 1 kpL A p A +ksL A s A The approach illustrated in this example is very widely used in calcu-lating U values ... thetwo parallel resistances as follows: 1 Rtequiv= 1 Rtrad+ 1 Rtconv= Ahrad+Ah = A hrad+hThus,Requiv= 1 A hrad+h A calculation shows A = 13 3 mm2= 1. 33 ì 10 4 m2for...
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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 13 .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. Evaluate the exit tempera-tures if A ... The heat exchange surface for a steam genera-tor. This PFT-type integral-furnace boiler, with a surface areaof 4 560 m2, is not particularly large. About 88% of the areais in the furnace...
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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 conductionWe first consider a fairly ... t/T can be viewed astT=hk(V /A) tρc(V /A) 2k=h(V /A) k·αt(V /A) 2= Bi Fo (5.7)Electrical and mechanical analogies to thelumped-thermal-capacity problemThe term capacitance is adapted ... our attention, first, to an analysis of unsteady heat transfer, beginning with a more detailed consideration of the lumped-capacity system that we looked at in Section 1. 3.5.2 Lumped-capacity...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 1 doc
... [5.6] 13 . Isothermal ellipsoid of semimajoraxis b and semiminor axes a conducts heat into an infinitemedium 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 ( 1 − Φ 1 )= 0 .19 The mean temperature isΘ =T 20 10 0 − 20 = 1 −Φ = 0. 81 soT ... medium atT∞(see items 4 and 7)4πR 1 +R/2hmeter [5 .18 ]9. Parallel cylinders exchange heat inan infinite conducting medium 2 cosh 1 L 2 −R 2 1 −R 2 22R 1 R 2 none [5.6] 10 . Same as 9,...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 3 pot
... = 3 20 φ− 3 28 0φ 3 = 3 2u∞(6. 52) Since φ is a constant for any Pr [recall eqn. (6.46)], we separate variables: 2 tdδtdx=dδ 2 tdx= 3 /u∞ 3 20 φ − 3 28 0φ 3 §6.5 Heat transfer ... 0.0 021 35 soτyx= (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 isτyx A = 0 .25 22( 0.5) 2 = 0.0 630 5 kg·m/s 2 = 0.0 630 5 N= 0 . 23 oz6.7 Turbulent boundary layersTurbulenceBig ... pressure, especially in liq-uids.Example 6.5Air at 20 ◦C and moving at 15 m/s is warmed by an isothermal steam-heated plate at 110C, ẵ m in length andẵminwidth. Find theaverage heat transfer coecient...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 4 ppt
... transitionalvalue. Problems 3356.31 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 heaterat 60◦C. Find h, τw, 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 is suddenlytranslated ... W/m 2 ) were instead fixed at its average value of 76◦C, whatwould the average wall heat flux be?6 .26 A cold, 20 mph westerly wind at 20 ◦F cools a rectangular build-ing, 35 ft by 35 ft by 22 ...
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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 predictinglaminar convection in a pipe.7 .2 Heat transfer to and from laminar flows in pipesNot many industrial pipe flows are laminar, but laminar heating and cool-ing does occur in an ... from a plate in a liquid flow. Int. J. Heat Mass Transfer, 3(4):3 05 309,1961.[6. 15] A. Žukauskas and A. Šlanciauskas. Heat Transfer in TurbulentFluid Flows. Hemisphere Publishing Corp., Washington,...
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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 errorsof one kind or another.In the face of a heat transfer situation that has ... 3 .60 8Rectangular a = 2b 3.391 4. 123 a = 4b 4.439 5.331 a = 8b 5.597 6. 490Parallel plates 7.541 8 .23 5different wall boundary conditions and a wide variety cross-sectionalshapes, both practical and ridiculous:...
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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 andGebhart [8. 18] , and Al-Arabi and El-Riedy [8. 19], among others. 8. 5 Film condensation 431on the same basis. The integration of eqn. (8. 47) subject ... 434 Natural convection in single-phase fluids and during film condensation 8. 5Figure 8. 12 Results of the exact b.l. analysis of laminar filmcondensation on a vertical plate [8. 36].Sadasivan and ... trans- 8. 4 Natural convection in other situations 417Figure 8. 6 The data of many investigators for heat transfer from isothermal horizontal cylinders during natural convec-tion, as correlated...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 9 pdf
... onnatural 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. 1Figure 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 heat transfer on constant ... shapes. Int. J. Heat Mass Transfer, 19: 1 399 –1404, 197 6.[8 .20 ] L. Pera and B. Gebhart. Natural convection boundary layer flowover horizontal and slightly inclined surfaces. Int. J. Heat Mass Transfer, ...
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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 1.95Isopropyl alcohol 10 to 100 22 .90 0.0789Mercury 5 to 20 0 490.60 .20 49Methane 90 18.877 100 16. 328 115 12. 371Methyl alcohol 10 to 60 24 .00 0.0773Naphthalene 100 ... to 20 0 42. 84 0. 1107 Nicotine −40 to 90 41.07 0.11 12 Nitrogen −195 to −183 26 . 42 0 .22 65Octane 10 to 120 23 . 52 0.09509Oxygen 20 2 to −184 −33. 72 −0 .25 61Pentane 10 to 30 18 .25 0.11 021 Toluene 10...
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A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 3 Part 4 potx
... Thegeometrical mean beam length is defined asL0≡ 4 (volume of gas)boundary area that is irradiated(10. 54) Thus, for two infinite parallel plates a distance apart, L0= 4A / 2A =2. Some other values ... net heat transfer is calculated using the surface area ofthe wall:Qnetg-w= A wgT 4 ggT 4 w= (0 .4) (5.67 ì 108)(0.098)( 14 73) 4 (0.12)(5 73) 4 = 32 kW/mTotal emissivity charts and ... Solar radiation usually arrives at an angleof less than 90◦to the surface because the sun is rarely directly overhead.We have seen that a radiant heat flux arriving at an angle less than 90◦is...
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