Date of Degree
2009
Document Type
thesis
Degree Name
MS (Master of Science)
Department
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.
Pages
vii, 67
Bibliography
65-67
Copyright
Copyright 2009 Neeraj Kumar Mishra
Recommended Citation
Mishra, Neeraj Kumar. "Effect of chamber pressure on liquid drop impacts on a stationary smooth and dry surface." thesis, University of Iowa, 2009.
http://ir.uiowa.edu/etd/408.