CHEN 3005 Lecture Notes - Lecture 16: Pega, Black Body, Photon
25 Dec 2014
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Non-newtonian fluid version of heat transfer --> not described by fourier"s law. Radiation is transmitted in vacuum (doesn"t need medium of heat transfer) Moves @ speed of light (conductive mechanisms we had moved @ speed of sound) Depends on absolute temperature (what we did before depended on t difference importance to chemical engineering. Typical wavelengths: close to visible --> lambda = 0. 1 - 10 micrometers [nanometers?] remember: wavelength = {speed of light}/{frequency} For opaque body a = adsorption = q(a)/q(i) = {amount absorbed}/{incident radiation} a (i) this is @ a specific frequency (a)/q. = q emission = e = q(e)/qb(e) for black body e (e)/q (e) Stephan-boltzmann law black body radiation temperature stephan-boltzmann constant: 1. 355*10-12 cal/(s cm2 k4) Note: depends just on absolute t above = for black body. Plank distribution: statistical mechanics part comes from boltzmann"s constant quantum comes from h need to integrate the eqn.
