THE DISPERSION OF MARKED FLUID IN TURBULENT SHEAR FLOW
THE DISPERSION OF MARKED FLUID IN TURBULENT SHEAR FLOW
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DOI：
10.1017/s0022112059000374
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发表时间：
1959-01-01
影响因子：
3.7
通讯作者：
ELDER, JW
中科院分区：
文献类型：
--
作者：
ELDER, JW
本文将Taylor（1954）基于雷诺类比的分析方法推广到描述明渠紊流中标记流体的扩散。计算出由湍流横向扩散和平均流对流共同作用引起的纵向扩散系数为5·9uτh，其中h为流体深度，uτ为摩擦速度。这与本文描述的实验一致。实验测得侧向扩散系数为0·23uτh，比各向同性假设值大3倍。同样的分析可以用来描述零浮力和有限浮力下离散颗粒的纵向弥散，并与巴彻勒、宾尼和菲利普斯（1955）以及宾尼和菲利普斯（1958）的观测结果进行比较。
The analysis used by Taylor (1954) and based on the Reynolds analogy has been extended to describe the diffusion of marked fluid in the turbulent flow in an open channel. The coefficient of longitudinal diffusion arising from the combined action of turbulent lateral diffusion and convection by the mean flow is computed to be 5·9uτh, where h is the depth of fluid and uτ the friction velocity. This is in agreement with experiments described herein. The laterla diffusion coefficient is found by experiment to be 0·23uτh, which is three times larger than the value obtained by the assumption of isotropy. The same analysis can be used to describe the longitudinal dispersion of discrete particles, both of zero buoyancy and of finite buoyancy, and comparison is made with observations by Batchelor, Binnie & Phillips (1955) and Binnie & Phillips (1958).