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EXPERIMENTS ON SPRAY FROM A ROLLING TIRE
by
Charles Anthony Radovich
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(AEROSPACE ENGINEERING)
August 2010
Copyright 2010 Charles Anthony Radovich
Object Description
| Title | Experiments on spray from a rolling tire |
| Author | Radovich, Charles Anthony |
| Author email | radovich@usc.edu; radovich@alumni.usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Aerospace & Mechanical Engineering (Computational Fluid & Solid Mechanics) |
| School | Viterbi School of Engineering |
| Date defended/completed | 2010-05-10 |
| Date submitted | 2010 |
| Restricted until | Unrestricted |
| Date published | 2010-08-10 |
| Advisor (committee chair) | Browand, Fred |
| Advisor (committee member) |
Blackwelder, Ron Redekopp, Larry Shung, Kirk |
| Abstract | A novel laboratory apparatus has been built to understand the key mechanisms behind spray emerging from a rolling tire. Several researchers have assessed the performance of spray suppression devices; however, there are no known efforts that address the question "what needs to be suppressed?" This investigation into how water in a tire groove evolves into a droplet field will ultimately contribute to driver safety.; Using high-speed imaging, water passing through a single circumferential groove was observed to leave the tire patch in the form of a thin liquid sheet, connecting the roadway and the tire. The sheet disintegrates into a droplet field and the breakup modes associated with this decay were identified with respect to Weber number.; Weber numbers based on the properties of water, tire speed and tire groove width were tested at 2700, 10900 and 24400. Measurements for the breakup length of the liquid sheet showed a dependence on Weber number proportional to We^(-1/6). The lateral displacement of the water exiting the tire patch was also measured. These tests showed the overall size of the spray field grows with We; however, the maximum water volume for all We's was delivered to the same distance from the road.; Downstream from the tire patch, a determination of the droplet field was performed. From this study, the distribution of droplet sizes was determined as a function of Weber number. At We=2,700, droplet sizes between 80 and 9000 micrometers were detected, with a mean diameter near 800 micrometers. Both the range of droplet sizes and the mean diameter were found to decrease with Weber number by approximately We^(-1/2). Based on these size distributions, Correlation Image Velocimetry (CIV) was used to estimate the distribution of droplet velocities as function of their size. These results reveal a strong correlation between droplet diameter and velocity which is comparable to that predicted for a simple sphere. |
| Keyword | correlation image velocimetry; droplet field; droplet imaging; droplet size distribution; droplets; tire spray |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m3363 |
| Rights | Radovich, Charles Anthony |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Radovich-3768 |
| Archival file | uscthesesreloadpub_Volume23/etd-Radovich-3768.pdf |
Description
| Title | Page 1 |
| Full text | EXPERIMENTS ON SPRAY FROM A ROLLING TIRE by Charles Anthony Radovich A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (AEROSPACE ENGINEERING) August 2010 Copyright 2010 Charles Anthony Radovich |
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