Li F, Havnes O
Institute of Electronics, Academia Sinica, Beijing 100080, People's Republic of China.
Phys Rev E Stat Nonlin Soft Matter Phys. 2001 Dec;64(6 Pt 2):066407. doi: 10.1103/PhysRevE.64.066407. Epub 2001 Nov 26.
In the present paper, shocks in a dusty plasma are studied. A set of macroscopic shock equations are introduced in which the charge on the dust particles and the electrostatic potential in the dusty plasma have been taken into account. It is found that two shock modes may exist in a dusty plasma. One that is called the fast mode corresponds to an acoustic wave and the other, called the slow mode, corresponds to a dust-acoustic wave. The results show that the electrostatic energy of dust particles affects the shock speed and shock heating. The shock speed of the slow mode is found to be strongly dependent on the nondimensional dust density parameter p. In a tenuous dust plasma of p<<1 for the slow mode, the flow of energy as the shock heats is mainly converted into thermal energy of the dust particles; for the fast mode, the plasma heating may be reduced and partly transferred into an increase of the charge on the dust particles when they cross the shock.
在本文中，研究了尘埃等离子体中的激波。引入了一组宏观激波方程，其中考虑了尘埃颗粒上的电荷以及尘埃等离子体中的静电势。研究发现，尘埃等离子体中可能存在两种激波模式。一种被称为快模式，对应于声波；另一种被称为慢模式，对应于尘埃声波。结果表明，尘埃颗粒的静电能会影响激波速度和激波加热。发现慢模式的激波速度强烈依赖于无量纲尘埃密度参数p。在p<<1的稀薄尘埃等离子体中，对于慢模式，激波加热时的能量流主要转化为尘埃颗粒的热能；对于快模式，当尘埃颗粒穿过激波时，等离子体加热可能会减少，并部分转化为尘埃颗粒上电荷的增加。
