Hottel

Hot-melt coatings Hottel zoning method Hot tub disinfection Hot tubs... 

H. C. Hottel, and J. B. Howard, Neu> Energy Technology Some Facts and Assessments, MIT Press, Cambridge, Mass., 1971. 

H. C. Hottel and E. S. Cohen, "Radiant Heat Exchange in a Gas-EiUed Enclosure," paper presented at ASME/AIChE Joint Heat Transfer Conference, University Park, Pa., Aug. 1957, AIChE Paper No. 57-HT-23. 

Thermodynamics Hendrick C. Van Ness, Michael M. Abbott Heat and Mass Transfer James G. Knudsen, Hoyt C. Hottel, Adel F. Sarofim, Phillip C. Wankat, Kent S. Knaebel Fluid and Particle Dynamics Janies N. Tilton Reaction Kinetics Stanley M. Walas... 

Hoyt C. Hottel, S.M., Professor Emeritus of Chemical Engineering, Massachusetts Institute of Technology Member, National Academy of Sciences, American Academy of Arts and Sciences, American Institute of Chemical Engineers, American Chemical Society, Combustion Institute (Section 5, Heat and Mass Transfer)... 

Resiilts for a large number of other cases are given by Hottel and Sarofim (op. cit., chap. 2) and Hamilton and Morgan (NACA-TN2836, December 1952). A comprehensive bibliography is provided by Siegel 3.nd [owe Thermal Radiation Heat Transfer, McGraw-HiU, 1992). 

NOTE Figures in this table are taken from plots in Hottel and Sarofim, Radiative Transfer, McGraw-HiU, New York, 1967, chap. 6. Values in parentheses are extrapolated. To convert degrees Ranldne to kelvins, multiply hy (5.556)(10 ). To convert atmosphere-feet to Idlopascal-meters, multiply hy 30.89. 

Clouds of Nonblack Particles The correction for nonblackness of the particles is complicated by multiple scatter of the radiation reflected by each particle. The emissivity . of a cloud of gray particles of individual surface emissivity 1 can be estimated by the use of Eq. (5-151), with its exponent multiplied by 1, if the optical thickness alv)L does not exceed about 2. Modified Eq. (5-151) would predict an approach of . to 1 as L 0°, an impossibihty in a scattering system the asymptotic value of . can be read from Fig. 5-14 as /, with albedo (0 given by particle-surface refleclance 1 — 1. Particles with a perimeter lying between 0.5 and 5 times the wavelength of interest can be handledwith difficulty by use of the Mie equations (see Hottel and Sarofim, op. cit., chaps. 12 and 13). 

If the gas volume is not isothermal and is zoned, an additional magnitude, the gas-to-gas total-exchange area QGj, arises (see Hottel and Sarofim. Radiative Tran.sfer, McGraw-Hill, New York, 1967, chap. 11). Space does not permit derivations of special cases only the single-gas-zone system is treated here. 

Treatment of radiative transfer in combustion chambers is available at varying levels of complexity, including allowance for temperature variation in both gas and refractory walls (Hottel and Sarofim,... 

Tlie equation of Hawtliome, Wenddell, and Hottel can be used to predict the flaine lengtli in the turbulent regime. 

Whilst the calculation of the radiant heat flux from a gas to an adjoining surface embraces inherent spectral and directional effects, a simplified approach has been developed by Hottel and Manglesdorf 54, which involves the determination of radiation emission from a hemispherical mass of gas of radius L, at temperature 7, ... 

Hottel, H, C. and Sarofim, A. F. Radiative Transfer (McGraw-Hill, New York, 1967)... 

During the 28th International Symposium on Combustion in 2000, Irvine Classman spoke about the importance of research in the area of combustion science to modem society in his Hottel Lecture. In his message he appealed to the combustion community to contribute to the solution of real issues and to be more creative in solving economic, social, and environmental problems. 

Hottel, H.C. and Hawthorne, W.R., Diffusion in laminar flame jets, Proc. Gombust. Inst., 3, 254, 1949. 

Hottel zoning method, 12 333 Hot trub (hot break), 3 579 Hot tubs, water treatment for, 26 194-196 Hot water fields, 12 530-531 Hot-water resources, electricity production from, 12 532... 

Unlike premixed flames, which have a very narrow reaction zone, diffusion flames have a wider region over which the composition changes and chemical reactions can take place. Obviously, these changes are principally due to some interdiffusion of reactants and products. Hottel and Hawthorne [5] were the first to make detailed measurements of species distributions in a concentric laminar H2-air diffusion flame. Fig. 6.5 shows the type of results they obtained for a radial distribution at a height corresponding to a cross-section of the overventilated flame depicted in Fig. 6.2. Smyth et al. [2] made very detailed and accurate measurements of temperature and species variation across a Wolfhard-Parker burner in which methane was the fuel. Their results are shown in Figs. 6.6 and 6.7. 

Williams, G.C., H.C. Hottel, and A. C. Scurlock. 1949. Flame stabilization and propagation in high-velocity gas streams. 3rd Symposium on Combustion, Flame and Explosion Phenomena Proceedings. Baltimore The Williams and Wilkins Co. 21-40. 

The question of radiative heat transfer is a complex one and the interested reader is referred to the books by Goody [43] and Hottel and Sarofim [44]. 

Rosenweig, R. E., Hottel, H. C., and Williams, G. C., Smoke-scattered light measurement of turbulent concentration fluctuation. Chem. Eng. Sd. 15, 111 (1961). 

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