Download A Heat Transfer Textbook, Third Edition by John H. Lienhard IV and John H. Lienhard V PDF

By John H. Lienhard IV and John H. Lienhard V

ISBN-10: 0971383529

ISBN-13: 9780971383524

This textbook is an advent to warmth and mass move orientated towards engineering scholars. the themes coated contain warmth conduction, compelled and common convection, thermal radiation, boiling, condensation, warmth exchangers, and mass move. The publication contains labored examples and end-of-chapter workouts. The 3rd version (2003) has been broadly revised and up-to-date from the previous moment variation (1987).

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Additional resources for A Heat Transfer Textbook, Third Edition

Example text

8 as the sphere cools from 40◦ C to 0◦ C. Plot the net entropy increase resulting from the cooling process above, ∆S vs. T (K). 10 A truncated cone 30 cm high is constructed of Portland cement. 5 cm. The lower surface is maintained at 6◦ C and the top at 40◦ C. The other surface is insulated. Assume one-dimensional heat transfer and calculate the rate of heat transfer in watts from top to bottom. To do this, note that the heat transfer, Q, must be the same at every cross section. Write Fourier’s law locally, and integrate it from top to bottom to get a relation between this unknown Q and the known end temperatures.

Find T2 . 15 Four infinite, parallel, black, opaque plates transfer heat by radiation, as shown in Fig. 19. Find T2 and T3 . 16 Two large, black, horizontal plates are spaced a distance L from one another. The top one is warm at a controllable temperature, Th , and the bottom one is cool at a specified temperature, Tc . A gas separates them. The gas is stationary because it is warm on the top and cold on the bottom. Write the equation qrad /qcond = fn(N, Θ ≡ Th /Tc ), where N is a dimensionless group containing σ , k, L, and Tc .

H= 6000 q = = 120 W/m2 K ∆T 120 − 70 If the heat flux is reduced, h should remain unchanged during forced convection. 67◦ C Lumped-capacity solution. We now wish to deal with a very simple but extremely important, kind of convective heat transfer problem. The problem is that of predicting the transient cooling of a convectively cooled object, such as we showed in Fig. 9. With reference to Fig. 10, we apply our now-familiar First law statement, eqn. 19) d [ρcV (T − Tref )] dt where A and V are the surface area and volume of the body, T is the temperature of the body, T = T (t), and Tref is the arbitrary temperature at which U is defined equal to zero.

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