The effect of the thermal prong—wire interaction on the response of a cold wire in gaseous flows (air, argon and helium)

Paranthoën, Pierre; Petit, Céline; Lecordier, Jean-Claude

doi:10.1017/s0022112082002584

Cited by 75 publications

(29 citation statements)

References 11 publications

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“…Each wire is sampled at 10kHz during a run for a total data rate of 80 kHz, which is recorded on a DEC LSI 11/23. It is observed experimentally that the response time of the probes varies from 330 llS on the high-speed side to 500 llS on the low-speed side (Paranthoen, Lecordier & Petit 1982b).…”

Section: Measurementsmentioning

confidence: 98%

Mixing and combustion with low heat release in a turbulent shear layer

1984

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Turbulent mixing and combustion are investigated in a gaseous shear layer formed between two streams: one containing a low concentration of hydrogen in nitrogen and the other containing a low concentration of fluorine in nitrogen. The resulting temperature field is measured simultaneously at eight points across the width of the layer using fast-response cold-wire thermometry. The results show the presence of large, hot structures separated by tongues of cool fluid that enter the layer from either side. The usual bell-shaped mean-temperature profiles therefore result from a duty cycle whereby a fixed probe sees alternating hot and cool fluid, which results in the local mean. The adiabatic flame temperature is not achieved in the mean, at any location across the layer. For fixed velocities, it is found that, in general, two different mean-temperature profiles result from a given pair of reactant compositions if the sides of the layer on which they are carried are exchanged ('flipped'). This finding is a direct consequence of the asymmetric entrainment of fluid into the layer. Results are compared with the predictions of Konrad and discussed in the context of the Broadwell-Breidenthal model. By comparison with the liquid result of Breidenthal, the amount of product formed in the layer at high Reynolds number is found to be dependent upon the Schmidt number. Results for a helium-nitrogen layer are discussed briefly.

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Section: Measurementsmentioning

confidence: 98%

Mixing and combustion with low heat release in a turbulent shear layer

1984

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“…The thermal inertia of the wire was corrected using an analogue compensator allowing to obtain a frequency response fiat from 20 Hz up to 10 KHz. On the other hand the thermal prong-wire interaction effect described by Paranthoen et al (1982) could not be corrected in situ and the correction was realized after an experimental determination of the plateau level Hp of the transfer function of the cold wire. This was achieved by using the method proposed by Lecordier et al (1984).…”

Section: Experimental Apparatusmentioning

confidence: 99%

The control of vortex shedding behind heated circular cylinders at low Reynolds numbers

Lecordier

Hamma

Paranthoën

1991

Experiments in Fluids

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102

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We report some experiments undertaken to investigate the control of vortex shedding behind electrically heated cylinders at low Reynolds numbers owing to the heat input brought to the cylinder. In airflow, depending on the Reynolds number value, complete suppression or modification of the vortex shedding phenomenon can be achieved with increase of heat input. Experimental results suggest that this control could result of a slight change of the separation point location due to the increase of the dynamic viscosity of the fluid.

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“…Whether that is a generic feature of the parallel-wire probe or a shortcoming of the calibration remains unclear at present. Heat conduction to the prong supports of the sensor wire has been found to produce small reductions of the dynamic temperature sensitivity of both hot wires and cold wires below the value obtained by static temperature calibrations such as used here (Paranthoen et al 1982(Paranthoen et al , 1983. Estimates of the magnitude of the end conduction effect for the sensors involved, based on the models of the cited works, show it to be roughly the same for both the hot-wire and cold-wire probes used in these experiments.…”

Section: Biplane Grid Experimentsmentioning

confidence: 75%

An experimental analysis of fluctuating temperature measurements using hot-wires at different overheats

Lienhard

Helland²

1989

Experiments in Fluids

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Abstract. Adjacent parallel hot-wire anemometers at different temperatures have sometimes been used to measure fluctuating temperatures in turbulent flows. This work presents an extensive experimental comparison of temperatures measured with a parallel-wire probe to temperatures simultaneously measured with a standard cold-wire probe. The results show the parallel-wire probe to work well in low intensity flows with temperature signals which are not too small. However, the parallel-wire probe temperature measurements are not accurate for high turbulence intensities or for small temperature signals, and in general the cold-wire system is probably to be preferred. MotivationsThe cold-wire temperature transducer, often used for the measurement of turbulent temperature fluctuations, has several inherent limitations. One is its small diameter and resultant fragility. Another is its comparatively low frequency response, for all but very small diameter sensors. In principle, both of these difficulties could be overcome by using a pair of constant-temperature hot wires to measure temperature and velocity. Hot wires are generally five to ten times larger in diameter, which makes them far more rugged, and their usable frequency responses may easily reach 10 kHz. Even higher bandwidths may be obtained from hot wires if loss of spatial resolution is not important.The output voltage of a hot wire varies with the wire temperature. If two sensors at different constant temperatures are situated parallel to each other, so that they each experience the same flow speed and temperature, then their two differing output voltages may be used to solve the voltage response equations for the flow speed and temperature. This is the principle of the parallel-wire probe. The sensors of such probes are generally confined to relatively low overheats so as to maintain a high temperature sensitivity.The idea of a parallel-wire probe is not new, and the use of varied temperature sensitivities to separate temperature and velocity signals is almost as old as the hot-wire itself. Corrsin suggested the concept in the forties (Corrsin 1949) and, in the following years, he made several applications of it. In 1949 and 1950, Corrsin and Uberoi carefully tested the combined temperature and velocity response of a hot-wire, and, by using several different values of the wire temperature, they obtained measurements of temperature-velocity correlations in a heated jet. A similar principle was employed by Mills et al. (1957) to determine the temperature fluctuation spectrum in nonisothermal grid turbulence. The technique of mixing probe sensitivities has been employed with checkered success many times in the intervening years, and dozens of papers have been written on the subject of hotwire temperature response (an exhaustive survey is given by Freymuth 1982). In addition, the dual-overheat probe has been 'reinvented' at least once (Sakao 1973).A recent application of the mixed sensitivity probe was made by Blair and Bennett (1984). They employed an array of con...

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The effect of the thermal prong—wire interaction on the response of a cold wire in gaseous flows (air, argon and helium)

Cited by 75 publications

References 11 publications

Mixing and combustion with low heat release in a turbulent shear layer

Mixing and combustion with low heat release in a turbulent shear layer

The control of vortex shedding behind heated circular cylinders at low Reynolds numbers

An experimental analysis of fluctuating temperature measurements using hot-wires at different overheats

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