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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.
Download data and documentation (4 files / 82.92 KiB)

Data files

  • Measured heat transfer 2.5µm wire aspect ratio=10000.xlsx
    27.19 KiB
  • Measured heat transfer 5µm wire aspect ratio=2000.xlsx
    21.94 KiB
  • Measured heat transfer 5µm wire aspect ratio=300.xlsx
    18.65 KiB

Documentation files

  • Description of measurement procedure and data.docx
    15.14 KiB

Citation and access

Data access level:

Creator/​Principal investigator(s):

  • Hans Lundström - University of Gävle

Research principal:

Data contains personal data:

No

Citation:

Language:

Method and outcome

Data format/​data structure:

Data collection Physical measurements and tests

Mode of collection:

Physical measurements and tests

Description of the mode of collection:

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.

Source of the data:

  • Research data

Sample

Name:

Wires

Description of sample:

Measurements were made on platinum-coated tungsten wires with diameters of 0.25 and 0.5 µm. The length-to-diameter ratios were 300, 2000, and 10000. The wire temperature was varied between 20 and 70°C during measurements.

Instrument

Name:

Keysight 3497A Data Acquisition Unit

Description of the instrument:

The Keysight 3497A Data Acquisition Unit is a multichannel instrument equiped with a relay switch and A/D converter with a maximum resolution of 1µV . Each channel can be configured independently. Connection to computer via GPIB interface. .

Name:

Wind tunnels

Description of the instrument:

Two custom-built wind tunnels were used to generate airflow velocities. One is a closed wind tunnel with a diameter of 200 mm for velocities ranging from 0.3 to 3 m/s, and the other is an open wind tunnel with an outlet diameter of 230 mm for velocities ranging from 5 to 30 m/s. Both tunnels were equipped with honeycomb flow straighteners and mesh. Velocities were measured by the differential pressure across the flow straightener, calibrated against a laser Doppler anemometer. The air temperature in the tunnels could be varied in the range 10 to 50°C for the smaller tunnel and between 20 and 40°C in the larger open circuit tunnel.

Topic and keywords

Standard för svensk indelning av forskningsämnen 2025:

Keywords:

Publications

Citation:

Lundström, H. (2021). Investigation of heat transfer from thin wires in air and a new method for temperature correction of hot-wire anemometers. Experimental Thermal and Fluid Science, 128, 110403.

Metadata

Version 1
doris
University of Gävle
Published: