%0 Journal Article
%T Study of physical constraint equation of sand-dust atmosphere<br>沙尘大气物理约束方程研究
%A Zhao Jian-Hua
%A Zhang Qiang
%A <br>赵建华
%A 张强
%J 物理学报
%D 2010
%I 
%X The closed physical constraint equations of sand-dust atmosphere are established based on both the interaction of wind-blown-sand two-phase flows and the mass change. Ideal analysis of the equations shows the following findings: (1) the density of the sand-dust atmosphere is bigger than that of the pure atmosphere, which will reduce the velocities of air parcels of the former to some extent; (2) velocity difference between sand-dust particles and air can make the fine particles located in a high-speed region and the coarse particles located in a low-speed region; (3) temperature difference between sand-dust particles and air can make the particles tend to enhance convection through acting as a heat source in updraft and a cold source in downdraft; (4) the constant-volume mass-specific heat capacity of the sand-dust atmosphere can give rise to the generation of new temperature gradient on an isobaric surface and then enhance the entrainment at the boundary of a sand-dust cloud; (5) the gas constant of the sand-dust atmosphere can lead to the generation of new pressure gradient on an isothermal surface and also enhance the entrainment at the boundary of a sand-dust cloud; (6) mass change can largely affect density, velocity and temperature of the sand-dust atmosphere. In brief, compared with the sand-dust cloud given by equations based on passive scalar, the real sand-dust cloud is high and great. Besides this, its inner convection and its entrainment at the boundary are active, and its horizontal motion is slow.
%K physical constraint equations of sand-dust atmosphere
%K two-phase flows
%K mass change
%K passive scalar<br>沙尘大气物理约束方程组
%K 两相流
%K 质量变化
%K 被动标量
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=9690F77F6810FAD56C803FEA7E0D36AA&yid=140ECF96957D60B2&vid=6AC2A205FBB0EF23&iid=59906B3B2830C2C5&sid=6937052D39090F42&eid=1D3FFD3ABE28C19A&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=40