Heat transfer in granular media with weakly interacting particles

Tiwari, A.; Biele, Jens

doi:10.1063/5.0108811

Cited by 5 publications

(7 citation statements)

References 60 publications

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“…[2] (see also Ref. [8][9][10]) by adding plane waves with random phases φ q and with the amplitudes determined by the power spectrum:…”

Section: Numerical Resultsmentioning

confidence: 99%

On the use of surface roughness parameters

Persson

2023

Preprint

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In most practical applications surface roughness is characterized by just one or two parameters (numbers). I show that the standard maximum surface height parameters fluctuate strongly between different surface realizations (or measurements), and should not be used in the design of engineering components. I show how some roughness parameters depends on the size of the roll-off region in the surface roughness power spectra, and introduce a new height parameter which is very reproducible. The numerical results presented agree well with experimental observations.

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“…[2] (see also Ref. [8][9][10]) by adding plane waves with random phases φ q and with the amplitudes determined by the power spectrum:…”

Section: Numerical Resultsmentioning

confidence: 99%

On the use of surface roughness parameters

Persson

2023

Preprint

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“…We thus test the thermal model using thermophysical parameters as a function of particle size as in Persson and Biele (2022) and assume a discontinuous dust layer by converting the model temperatures to flux observed by MARA F and assuming that only a fraction of the field of view ( f dust ) covered by dust: F = f dust F ( T dust ) + (1 − f dust ) F ( T rock ). We vary the area fraction of the dust cover from 0 to 1, the dust TI and the thickness of the dust cover, the TI of the rock is fixed at 305.…”

Section: Resultsmentioning

confidence: 99%

“…In the second method, we assume a mean particle size of the dust layer and apply a model relating this particle size to thermophysical parameters. The assumed k d is related to the dust mean particle size as described in Ryan et al (2020Ryan et al ( , 2022, Sakatani et al (2017) and most recently Persson and Biele (2022). Here will use the latter, as that work is specifically aimed at very fine, loosely packed dust aggregates.…”

Section: Thermophysical Modelingmentioning

confidence: 99%

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Evidence for the Presence of Thin and Heterogenous Dust Deposits on Ryugu's Boulders From Hayabusa2 MARA and Sample Data

Hamm,

Hamilton,

Goodrich

2023

Geophysical Research Letters

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Middle infrared spectral results obtained in‐situ by the Hayabusa2 MARA instrument are generally in‐line with previous results and a new comparison with sample C0137 returned from asteroid (162173) Ryugu, being similar to an aqueously altered CI1 chondrite. The mid‐IR spectrum of the boulder on Ryugu measured by MARA is shallower around 9 μm compared to the laboratory spectrum of C0137. Here we show that discontinuous, fine dust deposits can partially explain the differences in the spectral data and remain in agreement with the temperature observations of the boulder by MARA if an opaque dust layer covers less than 3% of the field of view. Such a presence of dust covering a low porosity boulder was discounted by previous analysis of the mid‐infrared MARA data which did not consider a highly porous boulder as we do here.

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“…The particles are thus not touching the surface of the substrate in the model, eliminating the need for computationally expensive heat transfer through the very narrow contacts. We consider this to be a satisfactory assumption given that the contacts between irregular particles are known to be extremely restrictive to heat flow (e.g., Sakatani et al 2018;Persson & Biele 2022). For particles larger than about 5 mm, radiative heat transfer is greater than an order of magnitude larger than heat transfer via contact conduction (Ryan et al 2020).…”

Section: Discussionmentioning

confidence: 99%

Rocks with Extremely Low Thermal Inertia at the OSIRIS-REx Sample Site on Asteroid Bennu

Ryan,

Rozitis,

Pino Munoz

et al. 2024

Planet. Sci. J.

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The Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) mission recently returned a sample of rocks and dust collected from asteroid Bennu. We analyzed the highest-resolution thermal data obtained by the OSIRIS-REx Thermal Emission Spectrometer (OTES) to gain insight into the thermal and physical properties of the sampling site, including rocks that may have been sampled, and the immediately surrounding Hokioi Crater. After correcting the pointing of the OTES data sets, we find that OTES fortuitously observed two dark rocks moments before they were contacted by the spacecraft. We derived thermal inertias of 100–150 (±50) J m−2 K−1 s−1/2 for these two rocks—exceptionally low even compared with other previously analyzed dark rocks on Bennu (180–250 J m−2 K−1 s−1/2). Our simulations indicate that monolayer coatings of sand- to pebble-sized particles, as observed on one of these rocks, could significantly reduce the apparent thermal inertia and largely mask the properties of the substrate. However, the other low-thermal-inertia rock that was contacted is not obviously covered in particles. Moreover, this rock appears to have been partially crushed, and thus potentially sampled, by the spacecraft. We conclude that this rock may be highly fractured and that it should be sought in the returned sample to better understand its origin in Bennu’s parent body and the relationship between its thermal and physical properties.

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Heat transfer in granular media with weakly interacting particles

Cited by 5 publications

References 60 publications

On the use of surface roughness parameters

On the use of surface roughness parameters

Evidence for the Presence of Thin and Heterogenous Dust Deposits on Ryugu's Boulders From Hayabusa2 MARA and Sample Data

Rocks with Extremely Low Thermal Inertia at the OSIRIS-REx Sample Site on Asteroid Bennu

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