MEASUREMENTS OF CONCENTRATION FLUCTUATIONS IN RELATIVE TURBULENT-DIFFUSION

被引:22
作者
CHATWIN, PC [1 ]
SULLIVAN, PJ [1 ]
机构
[1] UNIV LIVERPOOL, DEPT APPL MATH & THEORET PHYS, LIVERPOOL L69 3BX, MERSEYSIDE, ENGLAND
关键词
D O I
10.1017/S0022112079000951
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
In 1965 Sullivan made many measurements of concentration in dye plumes in the surface layer of Lake Huron with the primary purpose of estimating the distance–neighbour function (Sullivan 1965, 1971). This paper presents the results of a recent analysis of the concentration fluctuations in these experiments for, despite their great practical and theoretical importance, there are very few published reports of such measurements from natural environments. One reason for this apparent neglect has undoubtedly been the anticipated high noise level, and the present results confirm this expectation. The experimental analysis uses the framework of relative diffusion since this has great advantages compared with that of absolute diffusion. Despite the noise, the results are consistent, to the degree of spatial resolution attained, with the self-similar structure anticipated for relative, but not absolute, diffusion. Further interesting features of the results are that changes in the form of the statistical properties across the plume indicate an unexpectedly strong influence of the central regions, and that certain statistical properties have much less noisy profiles than that of the mean square fluctuations. The influence of molecular diffusion is shown to be strong. Interpretation of the results is based partly on the extension of the theory recently developed by Chatwin & Sullivan (1979a) for a cloud, although the limited spatial resolution attained did not allow direct critical examination of this work. © 1979, Cambridge University Press
引用
收藏
页码:83 / 101
页数:19
相关论文
共 16 条
[1]   DIFFUSION IN A FIELD OF HOMOGENEOUS TURBULENCE .2. THE RELATIVE MOTION OF PARTICLES [J].
BATCHELOR, GK .
PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY, 1952, 48 (02) :345-362
[2]   THE EFFECT OF HOMOGENEOUS TURBULENCE ON MATERIAL LINES AND SURFACES [J].
BATCHELOR, GK .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1952, 213 (1114) :349-&
[4]   RELATIVE DIFFUSION OF A CLOUD OF PASSIVE CONTAMINANT IN INCOMPRESSIBLE TURBULENT-FLOW [J].
CHATWIN, PC ;
SULLIVAN, PJ .
JOURNAL OF FLUID MECHANICS, 1979, 91 (MAR) :337-355
[5]  
CHATWIN PC, UNPUBLISHED
[7]   DISSIPATION OF A SHEET OF HEATED AIR IN A TURBULENT FLOW [J].
CRUM, GF ;
HANRATTY, TJ .
APPLIED SCIENTIFIC RESEARCH SECTION A-MECHANICS HEAT CHEMICAL ENGINEERING MATHEMATICAL METHODS, 1965, 15 (03) :177-&
[8]   TURBULENT DIFFUSION IN LAKE HURON [J].
CSANADY, GT .
JOURNAL OF FLUID MECHANICS, 1963, 17 (03) :360-+
[9]  
Csanady GT., 1973, GEOPHYS ASTROPHYSICS
[10]  
MONIN AS, 1975, STATISTICAL FLUID ME, V2