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Research Papers: Radiative Heat Transfer

Combined Experimental-Numerical Approach to Determine Radiation Properties of Particle Suspensions

[+] Author and Article Information
Jan Marti

Department of Mechanical
and Process Engineering,
ETH Zurich,
Zurich 8092, Switzerland
e-mail: martij@ethz.ch

Matthew Roesle

Department of Mechanical
and Process Engineering,
ETH Zurich,
Zurich 8092, Switzerland
e-mail: matt@roesle.org

Aldo Steinfeld

Department of Mechanical
and Process Engineering,
ETH Zurich,
Zurich 8092, Switzerland;
Solar Technology Laboratory,
Paul Scherrer Institute,
Villigen 5232, Switzerland
e-mail: aldo.steinfeld@ethz.ch

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 10, 2013; final manuscript received May 7, 2014; published online June 12, 2014. Assoc. Editor: Zhuomin Zhang.

J. Heat Transfer 136(9), 092701 (Jun 12, 2014) (7 pages) Paper No: HT-13-1196; doi: 10.1115/1.4027768 History: Received April 10, 2013; Revised May 07, 2014

A combination of experimental measurements with a numerical model is used to find the volume-averaged radiation properties—extinction coefficient, scattering albedo and approximated scattering phase function—of SiC particle suspensions with varying particle loadings. The experimentally determined angular radiation distribution of irradiated SiC samples is applied to fit a collision-based Monte Carlo (MC) model with a continuous participating media defining the particle suspension. A validation case with glass microspheres and Mie theory is implemented to verify the modeling procedure. Two types of SiC particles with dissimilar optical characteristics are examined and the respective radiation properties are determined for particle loadings between 0.05 and 0.30. The extinction coefficients of both types of SiC particle are in good agreement with the dependent scattering correlation of Kaviany and Singh.

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References

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Figures

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Fig. 1

Schematic of the spectroscopic goniometry system: (1) Xenon-arc lamp, (2) double monochromator, (3) mechanical chopper, (4) plano-convex spherical MgF2 lens pairs, (5) sample, (6) dual Si/MCT sandwich detector, (7) lock-in amplifier, and (8) data acquisition system

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Fig. 2

Photograph of the investigated SiC particles. (a) Black SiC and (b) green SiC.

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Fig. 3

Particle size distributions of the black and green SiC particles with indicated mean diameter. The indicated diameter is the equivalent spherical diameter.

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Fig. 4

SEM images of the SiC particles. (a) Black SiC and (b) green SiC.

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Fig. 5

SEM image of the glass microspheres used for validation with indicated scale

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Fig. 6

Particle size distribution of the glass microspheres used for validation. The indicated diameter is the equivalent spherical diameter.

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Fig. 7

Measured normalized detector signal of packed beds of glass microspheres compared to the numerical results of the MC model with Mie scattering

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Fig. 8

Spectral variation of normalized detector signal at 0 deg viewing angle for a sample with epoxy only and samples with black and green SiC particles for different sample thicknesses

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Fig. 9

Normalized detector signal of black SiC and green SiC particles for ɛ = 0.91

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Fig. 10

Normalized detector signal for different void fractions and similar sample thicknesses of the black SiC particles in comparison with the MC model

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Fig. 11

Comparison of the numerically derived DHG scattering phase function for black and green SiC samples

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Fig. 12

Comparison of the numerically derived DHG scattering phase functions for black and green SiC particles with ɛ = 0.95 with Mie scattering for nSiC = 2.70-i0.1

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Fig. 13

Numerically and experimentally derived extinction coefficients of the black and green SiC samples compared to the correlation from Singh and Kaviany [29] with indicated 95% confidence uncertainty of the experimental results

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Fig. 14

The scattering albedo derived from the MC model for the black and green SiC particles as a function of the particle loading together with a linear fit

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