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Instantaneous measurement of two-dimensional temperature distributions by means of two-color planar laser induced fluorescence (PLIF)

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Abstract

We present a noninvasive technique to measure instantaneously two-dimensional temperature distributions in liquid flows by means of two-color planar laser induced fluorescence (PLIF) of rhodamine B. This technique allows absolute temperature measurements by determining the relative intensities on two adequate spectral bands of the same dye and a reference measurement at a known temperature. Demonstration measurements on a heated turbulent jet injected into a coflow at ambient temperature are presented. The mean temperature field is investigated, as well as the temperature fluctuations. The results are compared to those obtained by means of a usual single-color PLIF technique.

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Abbreviations

A, B:

Parameters characterizing the sensitivity to temperature

Aeff, Beff:

Parameters characterizing the effective sensitivity to temperature in the case of reabsorption

Au, Bu:

A and B calculated with maximal uncertainties

c :

Concentration of the dye tracer

cy :

Optical path

d :

Diameter of the nozzle of the jet

I l :

Intensity of the laser beam

K opt :

Optical constant

K spec :

Spectral constant

r f :

Fluctuating part of Rf caused by fluctuations of the temperature only

R f :

Ratio of the fluorescence intensity

R u :

Uncertainty of Rf

t :

Time

T :

Absolute temperature

T 0 :

Reference temperature

T cal :

Calibration temperature

T co :

Temperature in the coflow

T inj :

Temperature of the heated jet at the injection

T m :

Heated jet centerline temperature

V :

Measurement volume

x, y:

Spatial coordinates

z :

Spatial coordinate along the axis of the jet

β :

Sensitivity to temperature

η T :

Heated jet temperature expansion coefficient

λ :

Wavelength

ϑ :

Fluctuations of the temperature T

ϑ * :

Normalized temperature fluctuations

θ * :

Normalized temperature

\(\bar X\) :

Time average of X

\(\tilde X\) :

Fluctuating part of X

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Correspondence to Fabrice Lemoine.

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Bruchhausen, M., Guillard, F. & Lemoine, F. Instantaneous measurement of two-dimensional temperature distributions by means of two-color planar laser induced fluorescence (PLIF). Exp Fluids 38, 123–131 (2005). https://doi.org/10.1007/s00348-004-0911-2

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  • DOI: https://doi.org/10.1007/s00348-004-0911-2

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