Appropriate Mean Absorption Coefficients for Infrared Radiation of Gases

Abu-Romia, M. M.; Tien, C. L.

doi:10.1115/1.3614392

Cited by 64 publications

(18 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on experiments, Cess and Mighdoll [4] have shown that, in the optically thin limit, these coefficients can be adequately Downloaded by [ (3) for carbon monoxide, carbon dioxide and water vapor where the temperature ratio T [T; = 1/2 and 2. Values of the Planck mean absorption coefficients for these gases have been reported by Abu-Rornia and Tien [5) in the range from 1000 R to 5000 R. Introducing the customary transformations…”

Section: Interaction Of Thermal Radiation In the Laminar Pipe Flow Ofmentioning

confidence: 96%

Interaction of Thermal Radiation in the Laminar Pipe Flow of Optically Thin Gases

Campo

Morales

Lacoa

1989

Chemical Engineering Communications

View full text Add to dashboard Cite

The influence of thermal radiation on laminar forced convection of a gray gas in a pipe flow is studied semi-analytically. The gas is considered as an absorbing-emitting medium and the 'thin gas model approximation is used to describe the radiative heat flux in the energy equation. Invoking the method of lines (MOL), the nonlinear boundary value problem is reduced to an initial value problem which is eventually solved by a standard Runge-Kutta integration scheme. Numerical results are presented graphically for a selected group of thermal parameters encompassing the thin gas behavior. Additionally, it is found that limiting cases namely: laminar plug flow and laminar parabolic flow, both in the absence of radiation define an envelope for the curves of bulk temperature and total Nusselt number describing the combined thermal process for a thin gas in laminar motion. In general, the comparisons reveal that these asymptotic solutions are valid when the entrance-to-wall temperature ratio is less than 2.

show abstract

Section: Interaction Of Thermal Radiation In the Laminar Pipe Flow Ofmentioning

confidence: 96%

Interaction of Thermal Radiation in the Laminar Pipe Flow of Optically Thin Gases

Campo

Morales

Lacoa

1989

Chemical Engineering Communications

View full text Add to dashboard Cite

show abstract

“…Hence the radiative flux may be written as: ∇ · Q RAD = 4σ T 4 (a P,CO 2 + a P,H 2 O ); where σ is the Stefan-Boltzmann constant, and a P,CO 2 , a P,H 2 O are the Planck mean absorption coefficients for CO 2 and H 2 O, respectively. The values of absorption coefficients were obtained from Abu-Romia and Tien [18], and their accuracy was checked by using Grosshandler's narrow band model [19].…”

Section: Conservation Of Speciesmentioning

confidence: 99%

Effect of unequal fuel and oxidizer Lewis numbers on flame dynamics

Shamim¹

2006

International Journal of Thermal Sciences

View full text Add to dashboard Cite

“…For intermediate values of the optical thickness of the emitting layer to reveal a natural process requires additional experimental studies, because in some cases it is possible to use absorption coefficients averaged Planck (approximation of an optically thin layer) or the Rosseland (zoom optically thick layer) [3].…”

mentioning

confidence: 99%

Method of calculating heat transfer in furnaces of small power

Khavanov

2016

MATEC Web Conf.

View full text Add to dashboard Cite

Abstract. This publication presents the experiences and results of generalization criterion equation of importance in the analysis of the processes of heat transfer and thermal calculations of low-power heat generators cooled combustion chambers. With generalizing depending estimated contribution of radiation and convective heat transfer component in the complex for the combustion chambers of small capacity boilers. Determined qualitative and quantitative dependence of the integrated radiative-convective heat transfer from the main factors working combustion chambers of small volume.Study of heat transfer in cooled combustion chambers and study the effect on the intensity of various factors is difficult and urgent task.From the analysis of theoretical and experimental data on heat transfer in combustion chambers of various plants it should be that the existing methods do not take into account the peculiarities of heat transfer in furnaces of small dimensions and can't be used for their thermal design.The process of heat transfer in furnaces from the radiating flow of combustion products is determined by the intensity of convection, molecular and radiative transfer, depending on the conditions of entry, ignition and combustion of the fuel-air mixture, changes in physicochemical properties of the medium, the hydrodynamic process conditions and other factors. Convective heat transfer, radiation and molecular thermal conductivity as heat transfer components of the complex, depending on the conditions of development of the process and make a different to-quantitative contribution to the resulting heat transfer. Neglecting any of these components without a detailed analysis of the process may lead to a distortion of the actual physical side of heat transfer and, consequently, to incorrect quantitative relations in the process. The same result is obtained and the analysis of the individual contribution of each component without consideration of their mutual influence [1].Analysis of heat transfer by convection processes, molecular and turbulent heat conduction and radiation in the flow of gas leads to a system of differential equations to be solved simultaneously. The mathematical difficulties in solving this system, make it necessary to search for an approximate solution methods. The basic assumption in this case is connected with the exception of the integral members of the energy transfer equations, which are introduced into it as a result of the presence of radiation. The operation exception

show abstract

Appropriate Mean Absorption Coefficients for Infrared Radiation of Gases

Cited by 64 publications

References 0 publications

Interaction of Thermal Radiation in the Laminar Pipe Flow of Optically Thin Gases

Interaction of Thermal Radiation in the Laminar Pipe Flow of Optically Thin Gases

Effect of unequal fuel and oxidizer Lewis numbers on flame dynamics

Method of calculating heat transfer in furnaces of small power

Contact Info

Product

Resources

About