| 摘要 |
A method and apparatus is provided to measure in fluids including suspensions and heterogeneous mixtures time-resolved histories of velocity magnitude and vector of unidirectional, unsteady and oscillating flows. A boundary layer develops from a sharp, leading edge of a plate approached by fluid flow. Its skin friction, measured at a fixed location on the plate by a hot-film sensor connected to a constant-temperature anemometer, is uniquely related to the magnitude of the approach velocity. Temperature-sensing gauges within the range of the thermal wake from the skin friction sensor allow to determine direction of the flow.
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