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The parameter B (B = DA?0/m) is the well known parameter for koinomatter (ordinary matter) meteors, D is the drag factor, ?0 is the air density at sea level, A is the cross sectional area of the meteoroid and m its mass.


It is also shown that he can be more efficient by increasing the drag factor (using higher vent setting) without increasing force.


By truncating the infinite series and applying the collocation method to solve a set of the linear algebraic equations, the approximate solution of the Oseen flow of finite clusters of spheres and the drag factor for each sphere are presented.


In this paper, the wake effect on drag factor in the axisymmetric Oseen flow of the finite clusters of equally spaced spheres with same size is studied.


The oseen flow of finite clusters of spheres and the wake effect on the drag factor

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 This paper deals with the drag factor of the multiple spherical liquid drops in the creeping motion by means of the Sampson singularities and collocation technique. The drag factors of the drops are calculated under distinct conditions: different numbers of liquid drops in the chain and different sphere spacings. From the results the influence of the viscosity ratio on the shielding effect and end effect are revealed. The convergence of the method is also studied in this paper.  本文利用Sampson奇点及配置法求解多个球形液滴在蠕动流中的阻力系数.计算了由不同数目液滴组成的液滴串在不同液滴间距下的阻力系数并揭示了粘度比对遮蔽效应和端缘效应的影响.文章还对方法的收敛性进行了研究.  The creeping motion around a sphere situated axisymmetrically near the entrance of a semiinfinite circular cylindrical tube is analyzed using infinite series solutions for the velocity components, pressure and the stream function. Truncating the infinite series, the corresponding coefficients in the series are determined by a collocation technique. The drag factor and the stress distribution on the surface of the sphere are calculated for the sphere in motion in quiescent fluid and for the flow with uniform... The creeping motion around a sphere situated axisymmetrically near the entrance of a semiinfinite circular cylindrical tube is analyzed using infinite series solutions for the velocity components, pressure and the stream function. Truncating the infinite series, the corresponding coefficients in the series are determined by a collocation technique. The drag factor and the stress distribution on the surface of the sphere are calculated for the sphere in motion in quiescent fluid and for the flow with uniform velocity at the entrance past a rigidly held sphere. The results indicate that a sphere near the entrance which has a uniform entrance velocity profile will suffer larger drag than that in an infinite tube. The convergence of the collocation technique is tested by numerical calculation. It is shown that the technique has good convergence properties.  本文研究了圆球在半无穷长圆管入口处的蠕动流。得到了速度分布,压力分布和流函数的无穷级数形式的分析解.采用配置法将无穷级数截断并确定出级数中各项系数.求出了均匀入口流绕静止圆球以及圆球以瞬时速度在管内静止流体中运动这两种情形下圆球的阻力系数以及圆球表面上的应力分布.结果表明,当圆球在入口处运动时会遭受到较无穷圆管内为大的阻力.本文还对配置法的收敛性进行了数值实验.试验证明,该法具有好的收敛性.  This paper deals with the Stokes flow of the arbitrary oblate axisymmetrical body by means of constant density and quadratic distribution function approximation for the method of continuous distribution of singularities, The Sampson spherical infinite series are chosen as fundamental singularities. The convergence, accuracy and the range of application of both two approximations are examined by the unbounded Stokes flow past the oblate spheroid . It is demonstrated that the drag factor and pressure distribution... This paper deals with the Stokes flow of the arbitrary oblate axisymmetrical body by means of constant density and quadratic distribution function approximation for the method of continuous distribution of singularities, The Sampson spherical infinite series are chosen as fundamental singularities. The convergence, accuracy and the range of application of both two approximations are examined by the unbounded Stokes flow past the oblate spheroid . It is demonstrated that the drag factor and pressure distribution both conform with the exact solution very well. Besides, the properties, accuracy and the range of application are getting bether with improving of the approximation of the distribution function. As an example of the arbitrary oblate axisymmetrical bodies, the Stokes flow of the oblate Cassini oval are calculated by these two methods and the results are conyergent and consistent. Finally, with quadratic distribution approximation the red blood cell is considered and for the first time the corresponding drag factor and pressure distribution on the surface of the cell are obtained.  本文以Sampson球形无穷级数作为基本奇点,采用分段等强度和分段二次抛物分布两种体内连续分布法解任意形状扁轴对称体的Stokes流动.通过扁球的无界绕流问题,对这两种方法的收敛性,精度和适用范围做了检验和比较.结果表明,在一定的范围内,无论是阻力系数或压力分布,它们的计算结果都和精确解符合得很好,而且,随着分布函数逼近程度的提高,其收敛性得到改善,适用范围也随之扩大.作为一般算例,分别用这两种方法解决了卡西尼扁卵形体的绕流问题,得到了一致的结果.最后,用分段二次连续分布法计算了具有一定生理意义的红细胞体的Stokes流动,首次得到了它的阻力系数和表面压力分布.   << 更多相关文摘 
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