Sandeep Prabhakara is in the final year of the dual degree course in mechanical engineering at the Indian Institute of Technology, Kharagpur.

M D Deshpande does research in the Computational and Theoretical Fluid Dynamics Division at National Aerospace Laboratories.

A moving fluid in contact with a solid body cannot have velocity relative to the body. Even though the question whether there is slip has been satisfactorily resolved now, it was a difficult and controversial problem. In the first part of this article several basic ideas and details related to this problem are discussed. The concluding part of the article will trace the development of ideas leading to the resolution of this important question. Extreme cases where fluid does slip will also be discussed.

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Address for Correspondence

M D Deshpande
CTFD Division
National Aerospace
Laboratories
Bangalore 560 017, India
Email: mdd@ctfd.cmmacs.ernet.in