Abstract
Within a cavity, bordering a fluid in turbulent flow, mass and heat transport, along with phenomena which depend on them (such as corrosion), are likely to be affected by penetration of turbulence from without. Experimental measurements of velocities within cavities have been carried out by hot film velocimetry. Measurements were carried out in a wind tunnel with cavities of various shapes, of width 2–10 mm. Turbulence was generated by a grid upstream of the cavity and velocity fluctuations were observed in the cavity for all but the smallest cavities. It is suggested that an eddy will penetrate a cavity if the cavity is larger than the Prandtl eddy length.
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