# American Institute of Mathematical Sciences

August  2019, 12(4): 765-789. doi: 10.3934/krm.2019030

## Effect of abrupt change of the wall temperature in the kinetic theory

 Department of Mathematics, National Cheng Kung University, Taiwan

Received  May 2018 Published  May 2019

Fund Project: The author is supported by MOST Grant 106-2115-M-006-009-MY2.

We consider a semi-infinite expanse of a rarefied gas bounded by an infinite plane wall. The temperature of the wall is $T_0$, and the gas is initially in equilibrium with density $\rho_0$ and temperature $T_0$. The temperature of the wall is suddenly changed to $T_w$ at time $t = 0$ and is kept at $T_w$ afterward. We study the quantitative short time behavior of the gas in response to the abrupt change of the wall temperature on the basis of the linearized Boltzmann equation. Our approach is based on a straightforward calculation of the exact formulas derived by Duhamel's integral. Our method allows us to establish the pointwise estimates of the microscopic distribution and the macroscopic variables in short time. We show that the short-time solution consists of the free molecular flow and its perturbation, which exhibits logarithmic singularities along the characteristic line and on the boundary.

Citation: Hung-Wen Kuo. Effect of abrupt change of the wall temperature in the kinetic theory. Kinetic & Related Models, 2019, 12 (4) : 765-789. doi: 10.3934/krm.2019030
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