Determination of surface shear stress with the naphthalene sublimation technique

Details Determination of surface shear stress with the naphthalene sublimation technique Determination of surface shear stress with the naphthalene sublimation technique

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..285l&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 285-287 (SEE N87-23341 16-91)

Physics

Geophysics

Naphthalene, Sediment Transport, Shear Stress, Sublimation, Wind Effects, Wind Shear, Wind Tunnel Tests, Heat Transfer, Mass Transfer, Skin Friction, Surface Temperature, Wind Velocity

Scientific paper

Aeolian entrainment and transport are functions of surface shear stress and particle characteristics. Measuring surface shear stress is difficult, however, where logarithmic wind profiles are not found, such as regions around large roughness elements. An outline of a method whereby shear stress can be mapped on the surface around an object is presented. The technique involves the sublimation of naphthalene (C10H8) which is a function of surface shear stress and surface temperature. This technique is based on the assumption that the transfer of momentum, heat and mass are analogous (Reynolds analogy). If the Reynolds analogy can be shown to be correct for a given situation, then knowledge of the diffusion of one property allows the determination of the others. The analytical framework and data acquisition for the method are described. The technique was tested in the Planetary Geology Wind Tunnel. Results show that the naphthalene sublimation technique is a reasonably accurate method for determining shear stress, particularly around objects where numerous point values are needed.

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