Accession Number : AD0637701

Title :   SIMILARITY-LAW 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 log-plus-linear 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 Monin-Obukhov 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, log-plus-linear-plus-square 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