By John H Lienhard V, John H Lienhard IV
Written through famous specialists within the box, this creation to warmth and mass move for engineering scholars has been utilized in the study room for over 32 years, and it has been revised and up-to-date usually. labored examples and end-of-chapter routines seem in the course of the booklet, besides well-drawn, illuminating figures.
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Additional info for A Heat Transfer Textbook: Fourth Edition
39). These are probably closest to having a “theoretical” objective. 3. 21). Such problems are usually the most difficult and the most valuable to you. 4. 41). 5. They require that you develop your ability to handle numerical and algebraic computation effectively. 17). Partial numerical answers to some of the problems follow them in brackets. Tables of physical property data useful in solving the problems are given in Appendix A. 1 A composite wall consists of alternate layers of fir (5 cm thick), aluminum (1 cm thick), lead (1 cm thick), and corkboard (6 cm thick).
Biot, although younger than Fourier, worked on the analysis of heat conduction even earlier—in 1802 or 1803. He grappled with the problem of including external convection in heat conduction analyses in 1804 but could not see how to do it. Fourier read Biot’s work and by 1807 had determined how to analyze the problem. (Later we encounter a similar dimensionless group called the Nusselt number, Nu = hL/kfluid . The latter relates only to the boundary layer and not to the body being cooled. 3 Modes of heat transfer 25 the surroundings.
1 A composite wall consists of alternate layers of fir (5 cm thick), aluminum (1 cm thick), lead (1 cm thick), and corkboard (6 cm thick). The temperature is 60◦ C on the outside of the for and 10◦ C on the outside of the corkboard. Plot the temperature gradient through the wall. Does the temperature profile suggest any simplifying assumptions that might be made in subsequent analysis of the wall? 2 Verify eqn. 16. 3 q = 5000 W/m2 in a 1 cm slab and T = 140◦ C on the cold side. 5 % carbon) • Ice • Spruce • Insulation (85 % magnesia) • Silica aerogel Indicate which situations would be unreasonable and why.