The principles of a luminescent oil-e lm skin-friction meter are described. Unlike the interferometric oil-e lm methods, this technique measures skin friction by detecting luminescent intensity of an oil e lm seeded with luminescent probe molecules. The measurement system for luminescence imaging is simple and easy to use, and this technique requires no special surface. The feasibility of this method is examined by applying it to several typical e ows.
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Liu et al. (1998) studied this question.
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