The order of slip boundary condition shows an apparent influence on the friction coefficient but only a slight influence on the Nusselt number if compressibility is ignored.
在不考虑可压缩性因素时，滑移边界条件的阶数对阻力系数的影响较大，对换热系数的影响不是十分明显。
2
Return to the apparent density, loose powder liquidity, the determination of compressibility GB1479, respectively and sieve analysis GB1480, GB1481, GB1482.