Measured heat transfer for thin wires in air

Hans Lundström

doi:10.5878/28sr-1k88

Measured heat transfer for thin wires in air

https://doi.org/10.5878/28sr-1k88

Measurements of heat transfer from a heated wire in an streaming air. The measurements were carried out as part of an investigation into hot-wire anemometers. The wires used were made of platinum-plated tungsten with diameters of 5 µm and 2.5 µm. A range of data sets is presented, covering air temperatures from 10 to 50 °C, velocities from 0.3 to 30 m/s and wire temperatures from 20 to 70°C, though not all data sets span the entire range.

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Hans Lundström - University of Gävle

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University of Gävle
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English

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Data collection - Physical measurements and tests

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Physical measurements and tests

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The wire under investigation was mounted between supporting prongs and connected to a variable power supply via a series resistor and a current shunt resistor. The voltages across the wire and the shunt resistor were measured using a Keysight 3497A data acquisition unit and LabVIEW software. The wire resistance and heat dissipation rate were calculated. The wire temperature was determined from the resistance using calibrated data. For selected values of wind tunnel temperature and velocity, the current flowing through the wire was manually adjusted to reach a desired sensor temperature. Using this method, a data map was compiled across various air velocities, air temperatures, and wire temperatures. From this map, data for different operating conditions of a hot wire sensor can be assembled. For example, collecting measurement points with equal wire temperature reveals the behaviour of the sensor wire as a constant temperature anemometer.

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University of Gävle

Measured heat transfer for thin wires in air

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