Question
A tungsten wire used in a constant current hot wire anemometer has the following parameters : Resistance at 0° C is 10Ω, Surface area is 10-4 m2, Linear temperature coefficient of resistance of the tungsten wire is 4.8 * 10-3 /°C, Convective heat transfer coefficient is 25.2W / m2 /°C, flowing air
temperature is 30°C, wire current is 100 mA, mass-specific heat product is 2.5 * 10-5 J /°CThe thermal time constant of the hot wire under flowing air condition in ms is
temperature is 30°C, wire current is 100 mA, mass-specific heat product is 2.5 * 10-5 J /°CThe thermal time constant of the hot wire under flowing air condition in ms is
Answer: Option B
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