Publication result detail

Objective function for numerical mean absorption bands optimization

KLOC, P.; AUBRECHT, V.; BARTLOVÁ, M.

Original Title

Objective function for numerical mean absorption bands optimization

English Title

Objective function for numerical mean absorption bands optimization

Type

Scopus Article

Original Abstract

Mean absorption coefficients (MACs) offer great potential for fast numerical calculation of radiation heat transfer. They are based on replacing complex absorption coefficient spectrum by a handful of frequency bands with a single, temperature dependent value assigned to each band. Accuracy of radiation transfer calculation thus depends on the accurate interpretation of the mean value inside each frequency band as well as on the proper band distribution. Yet finding optimal band distribution is not an easy task often requiring numerical optimization process. This contribution focuses on the parameters of such optimization process, namely selection of an objective function and its effect on the optimal band distribution. It demonstrates, that improper objective functions can produce physically unreasonable artifacts in the calculation of radiation heat transfer. Optimal formulation of the objective function is proposed in this contribution.

English abstract

Mean absorption coefficients (MACs) offer great potential for fast numerical calculation of radiation heat transfer. They are based on replacing complex absorption coefficient spectrum by a handful of frequency bands with a single, temperature dependent value assigned to each band. Accuracy of radiation transfer calculation thus depends on the accurate interpretation of the mean value inside each frequency band as well as on the proper band distribution. Yet finding optimal band distribution is not an easy task often requiring numerical optimization process. This contribution focuses on the parameters of such optimization process, namely selection of an objective function and its effect on the optimal band distribution. It demonstrates, that improper objective functions can produce physically unreasonable artifacts in the calculation of radiation heat transfer. Optimal formulation of the objective function is proposed in this contribution.

Keywords

mean absorption coefficients; numerical optimization; radiation transfer

Key words in English

mean absorption coefficients; numerical optimization; radiation transfer

Authors

KLOC, P.; AUBRECHT, V.; BARTLOVÁ, M.

RIV year

2018

Released

04.09.2017

Publisher

Czech Technical University in Prague

Location

Praha

ISBN

2336-2634

Book

Plasma Physics and technology

ISBN

2336-2626

Periodical

Plasma Physics and Technology

Volume

4

Number

3

State

Czech Republic

Pages from

269

Pages to

272

Pages count

4

URL

https://ojs.cvut.cz/ojs/index.php/PPT/article/view/6232

BibTex

@article{BUT141325,
  author="Petr {Kloc} and Vladimír {Aubrecht} and Milada {Bartlová}",
  title="Objective function for numerical mean absorption bands optimization",
  journal="Plasma Physics and Technology",
  year="2017",
  volume="4",
  number="3",
  pages="269--272",
  doi="10.14311/ppt.2017.3.269",
  issn="2336-2626",
  url="https://ojs.cvut.cz/ojs/index.php/PPT/article/view/6232"
}