Photophoresis of heated moderately large spherical aerosol particles

Malai, N. V.; Limanskaya, A. V.; Shchukin, E. R.; Stukalov, A. A.

doi:10.1134/s1024856012050065

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…Several experiments show photophoresis (Wurm & Krauss 2008;Loesche et al 2014; van Eymeren & Wurm 2012) and the theoretical treatment of photophoretic forces in different pressure regimes has also progressed (Malai et al 2012b;Beresnev et al 1993;Yalamov et al 1976a,b;Reed 1977).…”

Section: Introductionmentioning

confidence: 99%

“…We will not include temperature dependent k, k g and η but show how to account for that in Section 5. For smaller particles the boundary conditions in the sf regime can also be extended by some additional addends which are linear in the Knudsen number (Malai et al 2012b), introducing several more parameters. However, as mentioned before, we interpolate between the co and fm approximations.…”

Section: Introductionmentioning

confidence: 99%

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Photophoresis on particles hotter/colder than the ambient gas for the entire range of pressures

Loesche

Husmann

2016

Journal of Aerosol Science

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Small, illuminated aerosol particles embedded in a gas experience a photophoretic force. Most approximations assume the mean particle surface temperature to be effectively the gas temperature. This might not always be the case. If the particle temperature or the thermal radiation field strongly differs from the gas temperature (optically thin gases), given approximations for the free molecule regime overestimate the photophoretic force by an order of magnitude on average and for individual configurations up to three magnitudes. We apply the radiative equilibrium condition from the previous paper (Paper 1) -where photophoresis in the free molecular flow regime was treated -to the slip flow regime. The slip-flow model accounts for thermal creep, frictional and thermal stress gas slippage and temperature jump at the gas-particle interface. In the limiting case for vanishing Knudsen numbers -the continuum limit -our derived formula has a mean error of only 4 % compared to numerical values. Eventually, we propose an equation for photophoretic forces for all Knudsen numbers following the basic idea from Rohatschek by interpolating between the free molecular flow and the continuum limit.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photophoresis on particles hotter/colder than the ambient gas for the entire range of pressures

Loesche

Husmann

2016

Journal of Aerosol Science

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Photophoretic forces in coated-hollow microspheres

Pereira,

Panão

2025

Journal of Aerosol Science

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Photophoresis of spherical particles in slip-flow regime

Pereira¹,

Panão

2022

Physics of Fluids

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Photophoresis is a particle-light-induced phenomenon with several applications, such as spectroscopy, 3-Dimensional displays, and nanomanufacturing, to name a few. This work synthesizes, criticizes, and compares the main hydrodynamic and gas-kinetic models developed to quantify photophoretic forces in the slip-flow regime for uniform light beams, contrasting their predictions with experimental data available in the literature. The results comparing the different models evidence the simplicity and accuracy of Loesche and Husmann's model, which is then confronted with the experimental data available in the literature. However, considering the noticeable effect of high irradiance levels on photophoretic forces, namely, when temperature variations significantly change the thermofluid properties of the gaseous layer around the particle, more experiments are recommended to validate theoretical models. Finally, considering the photophoretic models depend on two asymmetry factors, J0 and J1, a physical interpretation of their meaning is provided, especially for the oscillations in the later argued as the result of Mie resonance effects.

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Photophoresis of heated moderately large spherical aerosol particles

Cited by 4 publications

References 3 publications

Photophoresis on particles hotter/colder than the ambient gas for the entire range of pressures

Photophoresis on particles hotter/colder than the ambient gas for the entire range of pressures

Photophoretic forces in coated-hollow microspheres

Photophoresis of spherical particles in slip-flow regime

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