By John H. Lienhard IV and John H. Lienhard V
This textbook is an advent to warmth and mass move orientated towards engineering scholars. the themes lined contain warmth conduction, compelled and traditional convection, thermal radiation, boiling, condensation, warmth exchangers, and mass move. The booklet contains labored examples and end-of-chapter routines. The 3rd variation (2003) has been generally revised and up to date from the outdated moment version (1987).
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Additional info for A Heat Transfer Textbook, Third Edition
Identify the operating point on your curve and report the value of Th that you must maintain. 17 A blackened copper sphere 2 cm in diameter and uniformly at 200◦ C is introduced into an evacuated black chamber that is maintained at 20◦ C. • Write a diﬀerential equation that expresses T (t) for the sphere, assuming lumped thermal capacity. • Identify a dimensionless group, analogous to the Biot number, than can be used to tell whether or not the lumpedcapacity solution is valid. • Show that the lumped-capacity solution is valid.
33) where 0 < ε ≤ 1. 34) where the transfer factor, F1–2 , depends on the emittances of both bodies as well as the geometrical “view”. 4. Further suppose that the walls were not black and had a much larger surface area than the thermocouple. What temperature would the thermocouple read? Solution. Qnet is now given by eqn. 34) and F1–2 can be found with eqn. 6704 × 10−8 ) (100 + 273)4 − (Ttc + 273)4 W/m2 Trial-and-error yields Ttc = 35◦ C. Radiation shielding. The preceding examples point out an important practical problem than can be solved with radiation shielding.
This calculation is based entirely on the assumption that Bi 1 for the thermocouple. 00278 k 45 W/m·K This is very small indeed, so the assumption is valid. 2 Invent and carry out a simple procedure for evaluating the time constant of a fever thermometer in your mouth. Radiation Heat transfer by thermal radiation. All bodies constantly emit energy by a process of electromagnetic radiation. The intensity of such energy ﬂux depends upon the temperature of the body and the nature of its surface. Most of the heat that reaches you when you sit in front of a ﬁre is radiant energy.