dean number meaning in English
迪安数
狄恩数
Examples
- ( 8 ) six branches of the flow in a rotating square duct are obtained . the limited points of every branch are different for different dean number . an eight - vortex phenomenon is also found
（ 8 ）对于正方形截面的分叉问题，本文得到六种无条件稳定和对称稳定的流动分支， dean数不同，流动分支的极限点不同，发现正方形截面最多可以存在八个涡。 - ( 6 ) as dean number is increased , the secondary flow firstly becomes symmetry and then the anticlockwise vortexes are enlarged , the contours of axial velocity and the stream function become symmetry , the secondary flow is intensified and the friction factor ratio increases
（ 6 ）增大dean数，二次流先趋于对称而后逆时针方向的二次涡增大，轴向速度和流函数等值线趋向于对称，摩擦系数比增大。 - The following results are obtained : ( 1 ) the flow in rotating helical pipes are affected by dean number , curvature , torsion ( or germano number ) , the ratio of the coriolis force to the centrifugal force f number ( or rossby number ) and the geometry of the cross section
研究结果表明： ( 1 )旋转螺旋管道流动特性受dean数、曲率、挠率(或germano数) 、科氏力与离心力之比f数(或rossby数)以及截面的形状五种因素的影响。 - The transport of macromolecules in curved tubes with permeable arterial wall was simulated numerically . the fields of axial velocity , the fields of secondary flow function and the distribution of wall shear stress along the transverse section of arterial wall were obtained under different dean number , 10
10800 ，计算了弯曲血管内的二次流轴向速度场和剪应力沿管壁分布的情况。计算求得了在不同dean数和peclet数下，其中10 - ( 2 ) with f varying , there exists a number fr which is about - 1 ( curvature , torsion and dean number have little influence on fr ) , when f > fr , the maximum of the axial velocity is near the outside bent and the friction factor ratio increases with f increasing ; when f < fr , the maximum is near the inner side bent and the ratio increases with f decreasing ; when f = fr , the distributions of the axial velocity are similar to those of poiseuille flow and the friction ratio is about 1
( 2 )当f变化时，存在确定的数值fr ( fr在- 1左右。曲率、挠率和dean数对fr的影响很小) ，当f fr时，轴向速度最大值偏向外侧，摩擦系数比随f增大而增大；当f fr时，轴向速度最大值偏向内侧，摩擦系数比随f减小而增大；当f = fr时，轴向速度的分布和poiseuille流近似相同，摩擦系数比约为1 。