Journal
PHYSICS OF FLUIDS
Volume 34, Issue 3, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0085921
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Funding
- Beijing Nova Program of Science and Technology [Z191100001119033]
- National Natural Science Foundation of China [51976002, 11935010]
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This study investigates the self-propulsion of a Janus particle suspended in a dilute gas at equilibrium and confirms the analytical results through numerical simulations.
The self-propulsion of a Janus particle suspended in a dilute gas at equilibrium is investigated in the free molecular regime. The Janus particle consists of two hemispheres with different momentum accommodation factors; the particle and the surrounding gas are held at different constant temperatures. Based on the gas kinetic theory, we calculate the particle's self-propulsion and drag force. We conclude that self-propulsion occurs only under the condition that the particle is hotter/colder than the suspension gas, and the self-propulsion force is proportional to the difference of the momentum accommodation factors and directed along the symmetry axis. The drag force, instead, is corrected by a term proportional to the average of the momentum accommodation factors. Our analytical results are confirmed by numerical Monte Carlo simulations.
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