Determination of skin friction in strong pressure-gradient equilibrium and near-equilibrium turbulent boundary layers

Dixit, Shivsai Ajit and Ramesh, ON (2009) Determination of skin friction in strong pressure-gradient equilibrium and near-equilibrium turbulent boundary layers. In: Experiments in fluids, 47 (6). pp. 1045-1058.

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Abstract

The conventional Clauser-chart method for determination of local skin friction in zero or weak pressure-gradient turbulent boundary layer flows fails entirely in strong pressure-gradient situations. This failure occurs due to the large departure of the mean velocity profile from the universal logarithmic law upon which the conventional Clauser-chart method is based. It is possible to extend this method,even for strong pressure-gradient situations involving equilibrium or near-equilibrium turbulent boundary layers by making use of the so-called non-universal logarithmic laws. These non-universal log laws depend on the local strength of the pressure gradient and may be regarded as perturbations of the universal log law.The present paper shows that the modified Clauser-chart method, so developed, yields quit satisfactory results in terms of estimation of local skin friction in strongly accelerated or retarded equilibrium and near-equilibrium turbulent boundary layers that are not very close to relaminarization or separation.

Item Type:	Journal Article
Additional Information:	copyright of this article belongs to Springer.
Keywords:	Velocity distribution; Reynolds-number; flow
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited:	01 Jan 2010 08:47
Last Modified:	19 Sep 2010 05:53
URI:	http://eprints.iisc.ernet.in/id/eprint/25164

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