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Metrological characteristics for thermoanemometer measuring transducers of fluid mass flow rates

  • Mechanical Measurements
  • Published:
Measurement Techniques Aims and scope

Conclusions

The variable-power mode can be obtained in two versions: by stabilizing the heating temperature or the difference between the heating temperature and that of the fluid.

In the first version the temperature variation of the fluid affects the output signal both directly and indirectly: The direct influence is reduced as the heating temperature rises but the indirect influence is not dependent on it.

In the second version (when stabilizing the temperature difference) the temperature variation of the fluid affects the output signal for the most part indirectly and the degree of this influence depends on the heating temperature, its character being different for various media.

The transducer's accuracy can be substantially improved by correcting the output signal for the fluid's temperature variation. For complicated types of correction it is preferable to stabilize the heating temperature because then the number Prr is not affected by the form of the correcting function and it is described by a simpler expression.

These conclusions are valid for any thermal flow-rate meters having a calibration characteristic that is expressed by Eq. (9).

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Literature cited

  1. R. K. Azimov, Measuring Transducers Having Distributed Thermal Parameters [in Russian], énergiya, Moscow (1977).

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  2. M. A. Mikheev and I. M. Mikheeva, Fundamentals of Heat Transfer [in Russian], énergiya, Moscow (1973).

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  3. N. B. Vargaftik, Handbook of Thermal Properties for Gases and Fluids [in Russian], Nauka Moscow (1972).

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  4. G. N. Bobrovnikov and B. M. Novozhilov, Izmer. Tekh., No. 4 (1978).

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Authors
  1. V. V. Almazov
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  2. N. N. Antonov
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Additional information

Translated from Izmeritel'naya Tekhnika, No. 12, pp. 47–48, December, 1980.

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Almazov, V.V., Antonov, N.N. Metrological characteristics for thermoanemometer measuring transducers of fluid mass flow rates. Meas Tech 23, 1123–1126 (1980). https://doi.org/10.1007/BF00828270

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  • DOI: https://doi.org/10.1007/BF00828270

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