Masters Theses


"The study of turbulent wakes is considered necessary to understand the droplet behavior associated with the collision coalescence phenomena in atmospheric clouds. The Vertical Atmospheric Wind Tunnel enables experiments dealing with this droplet behavior to be analyzed. The experiments conducted in the UMR Vertical Atmospheric Wind Tunnel consist of two parts: one is the investigation of the flow field characteristics in the test section of the wind tunnel; the other is the measurement of the turbulent structure in the wake of a sphere. The test section is rectangular in design and has a cross-sectional area of 36 square inches (6 inches X 6 inches). Mean velocity profiles show the flow to be uniform but increasing in magnitude throughout the downstream portion of the test section. Boundary layer thickness becomes noticeable during the latter portion of the test section. Turbulence intensity, measured in the longitudinal direction of the test section at 10 different downstream positions by a DISA 55D01 hot-wire anemometer, show the background turbulence generated by the wind tunnel to be very small. Mean velocity profiles in the wake of a sphere indicate rapid wake dissipation and show wake interaction with the wall boundary layer of the test section. Axisymmetric turbulence intensities are measured using an X-probe and two DISA 55D01 CTA units in both the Near and Far wakes of the sphere. Reynolds shear stresses are likewise measured and the wake development analyzed through the turbulent energy equation"--Abstract, pages ii-iii.


Lee, S. C.

Committee Member(s)

Oetting, R. B.
Montgomery, David N.


Mechanical and Aerospace Engineering

Degree Name

M.S. in Aerospace Engineering


United States. Department of Defense


University of Missouri--Rolla

Publication Date



ix, 101 pages

Note about bibliography

Includes bibliographical references (page 52).


© 1970 Darrell Weldon Pepper, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Turbulence -- Mathematical models
Wakes (Fluid dynamics)
Wind tunnels
Sphere -- Aerodynamics
Clouds -- Dynamics
Boundary value problems

Thesis Number

T 2511

Print OCLC #


Electronic OCLC #