• Scalar variance and the Beta Probability Density Function (PDF)

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Today a new paper (Article Number 200701, January 2007) has been published in the IFRF Combustion Journal (http://www.journal.ifrf.net), entitled:

Scalar variance and the Beta Probability Density Function (PDF)

by: Eduardo A. Brizuela


Eduardo A. Brizuela
Department of Mechanical Engineering
University of La Plata
Buenos Aires, Argentina.
Tel: (54-221) 423-6692
Email: Click here to send an e-mail message.

This Rapid Communication deals with specific aspects of the modelling of turbulent diffusion flames where the Beta probability distribution is used. The unique aspect of this paper is that the author shows that traditional limiting values for the transport equations, which can cause problems in the iterative solution process, may not be necessary. The Combustion Journal publishes this paper as a Rapid Communication in an effort to make developments available to the scientific community as quickly as possible.

This work applies especially to the modelling of turbulent diffusion flames when solving transport equations for a conserved scalar and its variance, and when adopting the Beta PDF as the assumed PDF, which is common practice. The solutions to the transport equations are limited to physically or mathematically valid ranges. However, setting limits to the temporary results during the iterative solution of the numerical model may lead to numerical difficulties, and it would be desirable to avoid them. This paper shows that in the present case there is no need for an upper limit to the variance equation.

Key Words:
turbulent diffusion flames, assumed Beta PDF, limits to moments, probability density function

The full paper may be downloaded from the server, in the “New Papers” section (http://www.journal.ifrf.net/articles.html), by clicking on the Acrobat PDF icon alongside the title.

Publication in the Journal
The Editor-in-Chief would like to remind all potential authors that publication in the Journal is open to all. If you have interesting results to publish in the field of, or related to, industrial combustion, we invite you to prepare a paper according to the guidelines given in the Author’s Guide on the website (http://www.journal.ifrf.net/).

Papers may be regular “articles” (typically up to 20 pages) or Communications (typically up to 4/5 pages). Review papers can of course be longer. Remember that figures and graphics in general can be in full color. This advantage should be encouraged.

All manuscripts and associated files, proposed for publication should be sent by the Corresponding Author in a compressed/zip file, as an email attachment clicking here. This file should include a statement that the proposal’s content is unpublished material that has not being submitted for publication elsewhere. When an article by the author(s) is cited in the proposed article as “in press”, a copy of this article should accompany the proposed article and should be included in the compressed file.
The Editor-in-Chief looks forward to receiving your proposals.