Files and links (1)
Otugen_Mehmet_19863.78 MB
PDF Restricted Access, VIEWABLE UPON REQUEST: contact archives@drexel.edu
Dissertation
An investigation of the structure of moderate Reynolds number plane air jets
Doctor of Philosophy (Ph.D.), Drexel University
1986
DOI:
https://doi.org/10.17918/00007447
Abstract
An experimental investigation of the moderate Reynolds number plane air jets was undertaken and the effect of the jet Reynolds number on the turbulent flow structure was determined. The Reynolds number, which was defined by the jet exit conditions, was varied between 700 and 7000. Other initial conditions, such as the initial turbulence intensity, were kept constant throughout the experiments. Both hot-wire and laser Doppler anemometry were used for the velocity measurements, while the temperature measurements in the heated (but essentially non-buoyant) jet were made utilizing laser induced Rayleigh scattering. Supplementary qualitative information was obtained from laser tomographic and Schlieren flow visualization studies. In the moderate Reynolds number regime, the turbulent flow structure is in transition. The average size and the number of the large scale of turbulence (per unit length of jet) is unaffected by the Reynolds number. A broadening of the turbulent spectra with increasing Reynolds number is observed. This indicates that there is a decrease in the strength of these large eddies resulting from a reduction of the relative energy available to them. This diminishes the jet mixing with the ambient as the Reynolds number increases. Higher Reynolds numbers lead to lower jet dilution and spread rates. On the other hand, at higher Reynolds numbers the dependence of jet mixing on Reynolds number becomes less significant as the turbulent flow structure develops into a self-preserving state.
Metrics
18 Record Views
Details
- Title
- An investigation of the structure of moderate Reynolds number plane air jets
- Creators
- Mehmet Volkan Ötügen
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xiii, 122 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991021888889904721