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Temperature compensation of hot-wire anemometer with photoconductive cell

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Abstract

A new temperature compensation technique for hot-wire anemometer is proposed in this article. In contrast to the available compensation techniques, a photoconductive cell is introduced here as a variable resistor in the bridge. The major advantage of adopting an active component such as photoconductive cell is that temperature compensation can be achieved by using any kind of temperature sensors, once the output of temperature sensor is given as a voltage. Validation experiments using a photoconductive cell with a thermocouple-thermometer are conducted in the temperature range from 30 to 50 °C and the velocity ranges from 8 to 18 m/s.

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Abbreviations

h(U):

convective heat transfer coefficient of the wire at U

E b :

bridge top voltage

E w :

voltage across the wire

I :

heating current through the hot-wire

R A :

resistance connected in tandem with the hot-wire in the bridge

R B :

variable resistance for overheat-ratio setting of the hot-wire

R C :

compensation resistance connected in series with R B in the bridge, 1/(R −1p + R −1CdS

R CdS :

photoconductive cell resistance

R P :

resistance connected parallel with R CdS

R wf :

wire resistance at T f

R wa :

wire resistance at T a

R ww :

wire resistance at working temperature of T w

R w0 :

wire resistance at 0 °C

T f :

fluid temperature

T a :

ambient temperature

T w :

working temperature of the wire

U :

flow velocity

V c :

compensating voltage applied to the input side of the R CdS

αw :

temperature resistance coefficient of the hot-wire

ΔV:

voltage across R A, voltage difference between E b and E w

* :

reference

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Authors and Affiliations

  1. Department of Mechanical Engineering, Seoul National University, 151-742, Seoul, Korea

    S. P. Lee, J. I. Kim & S. Kauh

Authors
  1. S. P. Lee
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  2. J. I. Kim
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  3. S. Kauh
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Lee, S.P., Kim, J.I. & Kauh, S. Temperature compensation of hot-wire anemometer with photoconductive cell. Experiments in Fluids 19, 362–365 (1995). https://doi.org/10.1007/BF00203424

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  • DOI: https://doi.org/10.1007/BF00203424

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