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A hot-wire surface gage for skin friction and separation detection measurements
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1975
Year
EngineeringFluid MechanicsMechanical EngineeringWearable TechnologyBoundary LayerSensor TechnologyFriction ControlHeat Transfer ProcessCalibrationSkin FrictionThermal AnalysisConstruction TolerancesThermodynamicsThermal ModelingInstrumentationHeat TransferNon-contact SensingHeat ConductionHeat Transfer EnhancementCivil EngineeringSeparation Detection MeasurementsHot-wire Surface GageSensor DesignThermal SensorThermal EngineeringSkin-friction Gage
A heated-element, skin-friction gage employing a very low thermal conductivity support is described. It is shown that the effective dimension of the gage in the stream direction in only 0.06 mm, including the effects of heat conduction in the supporting material. Because of its small size, the calibration of the gage is independent of the kind of boundary-layer flow (whether laminar or turbulent) and is insensitive to pressure gradients. Construction tolerances can be maintained so that a single universal calibration can be applied. Multiple gages, sufficiently closely spaced so as to interfere with each other, are shown to provide accurate determinations of the locations of the points of boundary-layer separation and reattachment.