Propulsion of Porous Plates in Thin Atmospheres by Temperature Fields

Küpper, Markus; Dürmann, C.; Beule, Caroline de; Wurm, Gerhard

doi:10.1007/s12217-014-9357-1

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…Several pressure differences were set and different samples were tested. The strength of the Knudsen compressor and its pressure dependence were measured, and the students observed a significant force correlation with the porosity of the plate (Küpper et al 2013). The gathered data was a first step for studying large porous bodies in protoplanetary disks during the planet formation process.…”

Section: Astrophysics: the Knudsen Effectmentioning

confidence: 99%

Benefits of ESA Gravity-Related Hands-on Programmes for University Students’ Careers

Callens¹,

Galeone

2016

Microgravity Sci. Technol.

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The Education Office of the European Space Agency (ESA) offers university students, from ESA Member and Cooperating States, the opportunity to perform investigations in physical sciences, life sciences, and technology, under different gravity conditions through three educational programmes. The "Fly Your Thesis!" (FYT) programme makes use of parabolic flights and the "Drop Your Thesis!" (DYT) programme utilizes a drop tower as microgravity carriers, while the "Spin Your Thesis!" (SYT) programme uses a large centrifuge to create hypergravity. To date, more than hundred university students had the chance to participate in the design, development, and performance of one or more experiments during dedicated campaigns. In the following paper, we examine demographics of past participants of the ESA Education Office gravity-related opportunities over the past seven years and evaluate the benefits of these educational programmes for the participants' studies and careers. Student teams that participated in one of the programmes between 2009 and 2013 were contacted to fill in a questionnaire. The feedback from the students

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Section: Astrophysics: the Knudsen Effectmentioning

confidence: 99%

Benefits of ESA Gravity-Related Hands-on Programmes for University Students’ Careers

Callens¹,

Galeone

2016

Microgravity Sci. Technol.

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“…It is considered to act on dust in Earth's atmosphere (Hidy & Brock 1967;Yalamov et al 1976a,b;Beresnev et al 2003). Also, it might work in protoplanetary disks on particles as large as meter (Krauss & Wurm 2005;Kuepper et al 2014b). It can also aid to levitate particles in laboratory settings ( van Eymeren & Wurm 2012).…”

Section: Introductionmentioning

confidence: 99%

Photophoresis on particles hotter/colder than the ambient gas in the free molecular flow

Loesche

Wurm

Jankowski

et al. 2016

Journal of Aerosol Science

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Aerosol particles experience significant photophoretic forces at low pressure. Previous work assumed the average particle temperature to be very close to the gas temperature. This might not always be the case. If the particle temperature or the thermal radiation field differs significantly from the gas temperature (optically thin gases), given approximations overestimate the photophoretic force by an order of magnitude on average with maximum errors up to more than three magnitudes. We therefore developed a new general approximation which on average only differs by 1 % from the true value.

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