The scalar spectrum in the viscous-convective subrange
The scalar spectrum in the viscous-convective subrange
复制标题
粘性对流子范围内的标量谱
DOI：
10.1017/s0022112067000680
复制
发表时间：
1967
影响因子：
3.7
通讯作者：
R. Brodkey
中科院分区：
文献类型：
--
作者：
James O. Nye;R. Brodkey
一种改进设计的光纤光探头用于测量湍流浓度波动和与这些相关的光谱。主要目的是建立实验的性质的标量谱的粘性对流子范围。当施密特数（v/D）远大于1时，（-1）-幂律形式的谱区的存在支持了Batchelor（1959）提出的均匀应变模型。在此范围内，数据不符合Pao（1965）提出的级联过程。另一个目的是进一步研究湍流混合的测量方面的浓度波动的衰减。更具体地说，研究了将Corrsin（1957，1964 a）的各向同性稳态混合理论应用于剪切管流情况的局限性以及该情况早期数据的有效性（Lee & Brodkey 1964; Brodkey 1966 a，B;和Gegner & Brodkey 1966）。
A modified design of a fibre optic light probe was used for the measurement of turbulent concentration fluctuations and the spectra associated with these. The main object was to establish experimentally the nature of the scalar spectrum in the viscous-convective subrange. The existence of a spectral region with a (-1)-power law form supports the uniform straining model proposed by Batchelor (1959) for Schmidt numbers (v/D) much greater than unity. For this range, the data do not agree with the cascading process suggested by Pao (1965). An additional object was to study further the decay of the concentration fluctuations in terms of a measure of the turbulent mixing. More specifically, the limitations of applying the isotropic stationary mixing theory of Corrsin (1957, 1964a) to a shear pipe flow situation and the validity of the earlier data for this case (Lee & Brodkey 1964; Brodkey 1966a, b; and Gegner & Brodkey 1966) were investigated.