
Accession Number : AD0637701
Title : SIMILARITYLAW PROFILES IN THERMALLY STRATIFIED SHEAR FLOWS.
Descriptive Note : Technical rept.
Corporate Author : COLORADO STATE UNIV FORT COLLINS FLUID DYNAMICS AND DIFFUSION LAB
Personal Author(s) : Chuang,H. ; Cermak,J. E.
Report Date : JUL 1966
Pagination or Media Count : 33
Abstract : Measured mean wind velocity and temperature profiles in the thermally stratified flow of a wind tunnel near the wall can be expressed in a logpluslinear law which is also representative of the field data. Although both laboratory and field data show some scatter around the theoretical line, a similarity between the mean wind velocity and temperature profiles does seem to exist. The scatter can partially be attributed to the fact that in some cases the MoninObukhov length scale becomes comparable in magnitude to the height under consideration. This in turn breaks down the assumption that was made in order to obtain the law. Subsequently, logpluslinearplussquare profiles were tried and the results showed little improvement on the scatter. Free convection seems to prevail in some runs of both laboratory and field experiments. The transition from a forced convection to a free convection in the thermally stratified flow was shown to be gradual and occurred at a Richardson number in the same range as predicted. Both the laboratory and the field data for zeta < 0 were best represented by a universal function of the form f5(zeta) where n = 3/2. (Author)
Descriptors : (*WIND, VELOCITY), (*GAS FLOW, WIND TUNNELS), THERMAL PROPERTIES, BOUNDARY LAYER, MATHEMATICAL ANALYSIS, CONVECTION(HEAT TRANSFER)
Subject Categories : Meteorology
Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE