Transient Heat Transfer in a Conducting Particle With Internal Radiant Absorption

Tuntomo, A.; Tien, C. L.

doi:10.1115/1.2911276

Cited by 13 publications

(5 citation statements)

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“…Many of these studies are focused on single-component fuels. For example, data are available from several researchers on the spectral variation of the complex index of refraction of iso-pentane [96], iso-octane [96], n-hexane [96], n-heptane [96][97][98], n-nonane [96], n-decane [96][97][98][99], n-hexene [96], o-xylene [96], and toluene [96], isopropanol [99], and n-butanol [99]. Although many of these components are the components of real fuels, the radiative properties of real fuels such as Diesel vary noticeably from these components.…”

Section: Radiative Properties Of Fuel Dropletsmentioning

confidence: 99%

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Mazumder

Roy

2023

Energies

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Modeling thermal radiation in combustion environments can be extremely challenging for two main reasons. First, the radiative transfer equation (RTE), which is the cornerstone of modeling radiation in such environments, is a five-dimensional integro-differential equation. Second, the absorption and scattering coefficients of molecular gases and particulates prevalent in combustion environments oscillate strongly with the wavenumber (or wavelength), i.e., the medium is strongly nongray, requiring the solution of the RTE for a large number of wavenumbers. This article reviews the progress that has been made in this area to date with an emphasis on the work performed over the past three decades. Progress in both deterministic and stochastic (Monte Carlo) solutions of the RTE is reviewed, in addition to the review of the treatment of the spectral properties of gases, soot, and fuel droplets that dominate combustion environments, i.e., spectral or nongray models. The application of the various state-of-the-art nongray models and RTE solution methods to flames (particularly turbulent), fires, combustors, and other combustion systems are summarized along with a critical discussion of the pros and cons of the models and methods. Finally, the challenges that remain in modeling thermal radiation in combustion systems are highlighted and future outlooks are shared.

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Section: Radiative Properties Of Fuel Dropletsmentioning

confidence: 99%

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Mazumder

Roy

2023

Energies

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“…I 0 (in W m −2 ) is the maximum value of the timedependent part of the incident intensity (see A15)). If the superconducting film is sufficiently thin and the difference T m (ω) − T f (ω; z = d) ≈ 0 can be neglected, from equation (10) we can identify the two widespread approximations of (i) weak thermal coupling (σ k (1) σ s (ω))…”

Section: Theorymentioning

confidence: 99%

“…(17a) and according to equation (10) the ω dependence of the temperature increase is entirely due to the heat propagation into the substrate described by σ s (ω) (10a). The integral which appeared in (17a) can be estimated to be 2 3 f (0) in the case of thin film when the absorption coefficient β 0 (in m −1 ) is sufficiently small, i.e.…”

Section: Theorymentioning

confidence: 99%

“…The high-frequency cutting (41 kHz) implies that |p f | 2 d 2 1 and under this restriction the power-balance equation (10) completed with (17b) becomes…”

Section: Analytical Formulation Of Theory For the Intermediate Freque...mentioning

confidence: 99%

“…which is 2π -periodic function of ωt due to the chopper action (ω ω 0 ) the expression (A11) can be put into the standard form [10]…”

Section: Appendix a Radiation Absorptionmentioning

confidence: 99%

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Thermal model for the bolometric response of high- superconducting films to chopped optical radiation

Genchev

Chakalov

Chern

et al. 1996

Supercond. Sci. Technol.

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Thermal detectors which convert the incident radiation to heat are frequently used to give a periodic response to the external signal modulated at a fixed low-frequency chopping frequency. Many workers have ascertained the bolometric response of high-quality epitaxial superconducting films on different substrates to chopped laser radiation. Based on these observations we made an a priori assumption that the voltage response of thin film is entirely due to a thermal mechanism, i.e. in the proposed one-dimensional heat conduction analysis any possible non-equilibrium processes are neglected. A new analytical formula is derived for the mean temperature increase in the superconducting film. This formula generalizes the previously well known analytical approximations. Further we explore a specific numerical example based on experimental data for the optical response of a thin (1.5 µm) high-T c Bi-based film on an SrTiO 3 substrate irradiated by chopped He-Ne laser radiation (λ = 633 nm). On the basis of the theory and the chopping frequency dependence of the peak voltage response an implementation of a new diagnostic method for evaluation of the thermal Kapitza conductance at the superconducting film-insulator interface is demonstrated.

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Radiation Combined with Conduction and Convection

Modest

2013

Radiative Heat Transfer

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Transient Heat Transfer in a Conducting Particle With Internal Radiant Absorption

Cited by 13 publications

References 0 publications

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Thermal model for the bolometric response of high- superconducting films to chopped optical radiation

Radiation Combined with Conduction and Convection

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