Document Type

Thesis

Date of Degree

2009

Degree Name

MS (Master of Science)

Degree In

Mechanical Engineering

First Advisor

Albert Ratner

Abstract

Impact of drops on a dry smooth surface was studied at elevated chamber pressures and low Reynold's numbers to characterize the effect of chamber pressure on drop splashing and spreading. Two drop sizes of methanol, ethanol, propanol, hexadecane and diesel were tested for impact speeds between 1.5 - 3.3 m/s and pressure of upto 12 bars. Splash ratio, unlike the results of Xu et al, increased sharply with decreasing impact speed suggesting that drop speed is a more critical parameter for splash. Drop splashing was also found to be affected by drop shape, with drop distortion having a significant impact on splash promotion or suppression. In accordance with existing theory, drop spreading and maximum spread factor were found to be independent of pressure in the regime tested. These observations provide new insights and comparison data for evaluating and modeling the behavior of alternate fuels like ethanol.

Keywords

Drop impacts, smooth surface, splashing, spreading

Pages

vii, 67

Bibliography

65-67

Copyright

Copyright 2009 Neeraj Kumar Mishra