The implications of particle rotation on the effect of photophoresis

Eymeren, J. van; Wurm, Gerhard

doi:10.1111/j.1365-2966.2011.20020.x

Cited by 32 publications

(15 citation statements)

References 4 publications

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“…1(a), the direction of the thermophoretic tension force is perpendicular to the direction of temperature gradient of the surrounding gas and the rotation axis of the particle, which can also be deduced from the above equation. When the spinning axis is parallel to the direction of temperature gradient, the influence of thermophoretic tension force can be neglected, which is in agreement with the observation by van Eymeren & Wurm (2012). However, when the temperature gradient is considerably large and the rotation is moderately fast, the effect of thermophoretic tension force should be considered.…”

Section: Expression Of Thermophoretic Tension Forcesupporting

confidence: 85%

Investigation on the thermophoretic tension force induced by particle rotation

Dong

Cao

Lin

2015

Monthly Notices of the Royal Astronomical Society

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Section: Expression Of Thermophoretic Tension Forcesupporting

confidence: 85%

Investigation on the thermophoretic tension force induced by particle rotation

Dong

Cao

Lin

2015

Monthly Notices of the Royal Astronomical Society

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“…This kind of the coupled spinning and circling motion of a single driven particle (not of Janus type) was discussed in Refs. [17,26]. To drive this kind of particle motion, the spinning and circling frequencies must be locked and the spinning direction fixed and normal to the confining plane.…”

Section: Particle Propulsion Mechanismmentioning

confidence: 99%

Active Janus particles in a complex plasma

Nosenko

Luoni

Kaouk

et al. 2020

Phys. Rev. Research

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Active Janus particles suspended in a plasma were studied experimentally. The Janus particles were micronsize plastic microspheres, one half of which was coated with a thin layer of platinum. They were suspended in the plasma sheath of a radio-frequency discharge in argon at low pressure. The Janus particles moved in characteristic looped trajectories, suggesting a combination of spinning and circling motion; their interactions led to the emergence of rich dynamics characterized by non-Maxwellian velocity distribution. The particle propulsion mechanism is discussed, the force driving the particle motion is identified as photophoretic force.

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“…Both calculations and laboratory experiments demonstrate that particles can be photophoretically transported at higher levels of disks near its optical surface. At this location, photophoresis can be induced by stellar radiation and thermal radiation from the disk (Wurm and Haack 2009;van Eymeren and Wurm 2012).…”

Section: Introductionmentioning

confidence: 99%

Photophoretic Strength on Chondrules. 1. Modeling

Loesche

Wurm

Teiser

et al. 2013

ApJ

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Photophoresis is a physical process that transports particles in optical thin parts of protoplanetary disks, especially at the inner edge and at the optically surface. To model the transport and resulting effects in detail, it is necessary to quantify the strength of photophoresis for different particle classes as a fundamental input. Here, we explore photophoresis for a set of chondrules. The composition and surface morphology of these chondrules was measured by X-ray tomography. Based on the three-dimensional models, heat transfer through illuminated chondrules was calculated. The resulting surface temperature map was then used to calculate the photophoretic strength. We found that irregularities in particle shape and variations in composition induce variations in the photophoretic force. These depend on the orientation of a particle with respect to the light source. The variations of the absolute value of the photophoretic force on average over all chondrules is 4.17%. The deviation between the direction of the photophoretic force and illumination is 3.0 • ± 1.5 • . The average photophoretic force can be well approximated and calculated analytically assuming a homogeneous sphere with a volume equivalent mean radius and an effective thermal conductivity. We found an analytic expression for the effective thermal conductivity. The expression depends on the two main phases of a chondrule, and decreases with the amount of fine-grained devitrified, plagioclase-normative mesostasis up to factor of three. For the chondrule sample studied (Bjurböle chondrite), we found a dependence of the photophoretic force on chondrule size.

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The implications of particle rotation on the effect of photophoresis

Cited by 32 publications

References 4 publications

Investigation on the thermophoretic tension force induced by particle rotation

Investigation on the thermophoretic tension force induced by particle rotation

Active Janus particles in a complex plasma

Photophoretic Strength on Chondrules. 1. Modeling

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