Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12666/863
Title: A simple geometrical model for calculation of the effective emissivity in blackbody cylindrical cavities
Authors: De Lucas Veguillas, Javier
Keywords: Blackbody;Effective emissivity;Monte Carlo method;Ray tracing
Issue Date: 15-Oct-2015
Publisher: Springer Link
DOI: 10.1007/s10765-014-1757-3
Published version: https://link.springer.com/article/10.1007/s10765-014-1757-3
Citation: International Journal of Thermophysics 36: 267-282
Abstract: A simple geometrical model for calculating the effective emissivity in blackbody cylindrical cavities has been developed. The back ray tracing technique and the Monte Carlo method have been employed, making use of a suitable set of coordinates and auxiliary planes. In these planes, the trajectories of individual photons in the successive reflections between the cavity points are followed in detail. The theoretical model is implemented by using simple numerical tools, programmed in Microsoft Visual Basic for Application and Excel. The algorithm is applied to isothermal and non-isothermal diffuse cylindrical cavities with a lid; however, the basic geometrical structure can be generalized to a cylindro-conical shape and specular reflection. Additionally, the numerical algorithm and the program source code can be used, with minor changes, for determining the distribution of the cavity points, where photon absorption takes place. This distribution could be applied to the study of the influence of thermal gradients on the effective emissivity profiles, for example. Validation is performed by analyzing the convergence of the Monte Carlo method as a function of the number of trials and by comparison with published results of different authors.
URI: http://hdl.handle.net/20.500.12666/863
E-ISSN: 1572-9567
ISSN: 0195-928X
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