A Fast Algorithm for Calculation of Radiative Energy Distributions Received by Pinhole Image-Formation Process From 2d Rectangular Enclosures

Zhou, Huaichun; Feng, Sheng; Han, Shu-Dong; Chen, Zheng

doi:10.1080/10407780050195689

Cited by 17 publications

(1 citation statement)

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“…The energy scattered by the medium, 1 ( ′, ), is the source of the indirect contribution to the radiation intensity. [156] Its contribution to the radiation intensity can be treated in the same way as the energy emitted by ( ′). The boundary condition in Eq.…”

Section: Dresor Methodsmentioning

confidence: 99%

A Review on the Applications of Non-gray Gas Radiation Models in Multi-dimensional Systems

Zheng¹,

Sui²,

Sun³

et al. 2021

ES Energy Environ.

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Keeping gas radiation is a major way of heat transfer in flames. It affects temperature distributions and hence causes energy transfer in the combustion gaseous as well as subsequent chemical reactions. Accurate and efficient modeling of radiative heat transfer in multi-dimensional combustion systems is challenging, due to the drastic and rapid change of the radiative properties of the reacting gases in the whole spectrum, and the extensive computational cost for solving the radiative transfer equation (RTE) in multi-dimensional space. Several gas radiation models and RTE solution methods have been proposed to treat non-gray radiation heat transfer in combustion systems. In this paper, we first review the development of spectral line databases, gas radiation models and RTE solution methods. Subsequently, the development of radiation model parameters for different gaseous species is discussed. Next, recent simulation investigations are reviewed for one-dimensional, twodimensional and three-dimensional systems involving these state-of-the-art radiation models. In addition, we also discuss machine learning approaches for establishing gas radiation models and solving RTEs in non-gray gas radiative problems, an alternative and flexible way to deal with the complex and dynamic systems. Hopefully, this review will provide an up-to-date knowledge about the numerical calculations of gas radiation heat transfers in combustion systems.

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Section: Dresor Methodsmentioning

confidence: 99%

A Review on the Applications of Non-gray Gas Radiation Models in Multi-dimensional Systems

Zheng¹,

Sui²,

Sun³

et al. 2021

ES Energy Environ.

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Road surface mirage: A bunch of hot air?

et al. 2011

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The inferior mirage from road surfaces is a common phenomenon, which can be easily seen in everyday life. It has been recognized in the literature as a light refraction phenomenon due to the refractive index gradient caused by the temperature gradient in the air strata above the road surfaces. However, it was also suggested that the mirage is just a phenomenon of specular reflection at grazing incidence. Because of the lack of reasonable and quantitative evidence, the generally accepted light refraction theory has not yet been refuted. Here we show some mirror-like reflection images captured from a road surface stretch in Yujiashan North Road, Wuhan, China, when there was no obvious temperature gradient on or above the road, measured on a winter day in December 2009. This provided direct evidence to doubt the temperature induced light refraction mechanism of the inferior mirage. Furthermore, the critical grazing angle of about 0.2° to the road plane where the mirror-like reflection appears could not make the rough surface scatter incident light as a smooth surface according to the Rayleigh criterion. Therefore the phenomenon is a mirrorlike observation effect of scattering from the surface, which cannot be entirely explained by light refraction via air strata. The results demonstrate that the image-formation mechanism and the observer-based-analysis method shown here potentially offer a means of understanding a wide range of scattering phenomena from rough surfaces at grazing angle; for example, the superior mirages of unusual brightness occasionally observed over frozen lakes and the off-specular reflection phenomenon.

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