Submitted on: 15 November 2004.
Revised on: 10 March 2005.
Accepted on: 08 May 2005.
___________________International Journal of Fluid Mechanics Research
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Submitted on: 17 February 2013.
Revised on: 01 April 2013.
Accepted on: 24 May 2013.
___________________International Journal of Fluid Mechanics Research
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