By John H Lienhard V, John H Lienhard IV
Written by means of well-known specialists within the box, this creation to warmth and mass move for engineering scholars has been utilized in the school room for over 32 years, and it has been revised and up to date frequently. labored examples and end-of-chapter workouts look in the course of the e-book, in addition to well-drawn, illuminating figures.
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Extra resources for A Heat Transfer Textbook: Fourth Edition
Example text
7) To get the left-hand side into a convenient form, we introduce Gauss’s theorem, which converts a surface integral into a volume integral. 8) R Therefore, if we identify A with (k∇T ), eqn. 10) The limitations on this equation are: • Incompressible medium. ) • No convection. (The medium cannot undergo any relative motion. ) 2 Consider f (x) dx = 0. If f (x) were, say, sin x, then this could only be true over intervals of x = 2π or multiples of it. For eqn. 9) to be true for any range of integration one might choose, the terms in parentheses must be zero everywhere.
What fraction of the heat transfer from the bulb is by radiation directly from the filament through the glass? 31 produce? 6 W/m2 K). Methanol at 87◦ C flows over the other side (h = 141 W/m2 K). The metal functions as an electrical resistance heater, releasing 1000 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. 6 W/m2 K) and by radiation to a parallel black wall at 80◦ C. What is the temperature of the heater if it delivers 9000 W/m2 ?
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). The temperature is 60◦ C on the outside of the for and 10◦ C on the outside of the corkboard.