A HEAT TRANSFER TEXTBOOK - THIRD EDITION Episode 2 Part 7 pps

... 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 ...

... 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,...

... 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:...

... 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...

... 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, ...

... 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...

... possi-bilities in turn. Heat transfer at low rates of mass transfer One very common case of low-rate heat and mass transfer is the evapora-tion of water into air at low or moderate temperatures. ... mass transfer. Coupling can arise when temperature-dependent mass transfer pro-cesses cause heat to be released or absorbed at a surface. For example,during evaporation, latent heat is absorbed at a liquid surface ... surfacetemperature of the burning carbon.Simultaneous heat and mass transfer processes may be classified aslow-rate or high-rate. At low rates of mass transfer, mass transfer hasonly a negligible influence...

... tempera-ture. We may evaluate h∗and g∗m,iin the same way when heat and mass transfer occur simultaneously. If composition variations are not large,as in many low-rate problems, it may be adequate to ... whenmore than one species is transferred? §11.9 Simultaneous heat and mass transfer 667Stagnant film model of heat transfer at high mass transfer ratesThe multicomponent energy equation. Each species ... transfer Transpiration cooling. To calculate simultaneous heat and mass trans-fer rates, one must generally look at the energy balance below the wall aswell as those at the surface and across the boundary...