A device measuring the difference between the incoming fluid flow temperature and the temperature of artificially heated fluid (see Fig. 1).

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Fig. 1. Thermoanemometer sensor schematic .

Mathematical Model

The temperature difference is related to thermal properties of fluid (

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body	--uriencoded--\%7B \lambda, \, a, \, \nu\%7D

) and flow velocity

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body	u

:

...

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anchor	1
alignment	left

\Delta T = \frac{q \, r}{\lambda}\frac{1}{\rm Nu}

...

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The calibration plot is usually set in

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body	--uriencoded--\displaystyle \left \%7B \frac%7B1%7D%7B\Delta T%7D, \, %7B\rm Nu%7D \right \%7D

coordinates or in cae of a small velocity range in

LaTeX Math Inline

body	--uriencoded--\displaystyle \left \%7B \frac%7B1%7D%7B\Delta T%7D, \, u \right \%7D

coordinates.

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