[Soft-matter] Soft Matter and Stat Phys Seminar on 17 Dec 2021

[Maciej Lisicki]

Dear Soft Matter Colleagues and Friends,

For the final sfot matter & statistical physics meeting of 2021, on Friday 17 December 2021 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a seminar during which

Paweł Żuk (Lancaster University and IChF PAN)

will give a talk

Transient dynamics in outflow of energy from system in nonequilibrium stationary state

Abstract
We investigate the thermal relaxation of an ideal gas in a nonequilibrium stationary state. The gas is enclosed between two walls, which initially have different temperatures. After making one of the walls adiabatic, the system returns to equilibrium. We notice two distinct modes of heat transport and associated time scales: one connected with traveling heat front and the other with internal energy diffusion. At the heat front, which moves at the speed of sound, pressure, temperature, and density change abruptly, leaving lower values behind. It is unlike shock, sound wave, or thermal wave. The front moves multiple times between the walls and is the dominant heat transport mode until surpassed by diffusion. We found that it can constitute an order 1 factor in shaping the dynamics of internal energy outflow. We found that cooling such a system is quicker than heating and that hotter bodies cool down quicker than colder ones. The latter is known as Mpemba effect.

We warmly welcome everyone to attend the talk and the Soft Matter Coffee Break after the seminar, held in room 4.51 (4th floor).

Maria Ekiel-Jeżewska
Maciej Lisicki
Piotr Szymczak

--
dr hab. Maciej Lisicki
Institute of Theoretical Physics | Faculty of Physics
University of Warsaw
softmatter.fuw.edu.pl <http://softmatter.fuw.edu.pl/>






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