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Open AccessFeature PaperArticle

Temperature Fields of the Droplets and Gases Mixture

High Energy Physics Processes School, National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk 634050, Russia
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Appl. Sci. 2020, 10(7), 2212; https://doi.org/10.3390/app10072212
Received: 29 January 2020 / Revised: 19 March 2020 / Accepted: 23 March 2020 / Published: 25 March 2020
(This article belongs to the Special Issue Heat and Mass Transfer in Intense Liquid Evaporation)
In this research, we obtain gas–vapor mixture temperature fields generated by blending droplets and high-temperature combustion products. Similar experiments are conducted for droplet injection into heated air flow. This kind of measurement is essential for high-temperature and high-speed processes in contact heat exchangers or in liquid treatment chambers, as well as in firefighting systems. Experiments are conducted using an optical system based on Laser-Induced Phosphorescence as well as two types of thermocouples with a similar measurement range but different response times (0.1–3 s) and accuracy (1–5 °C). In our experiments, we inject droplets into the heated air flow (first scheme) and into the flow of high-temperature combustion products (second scheme). We concentrate on the unsteady inhomogeneous temperature fields of the gas–vapor mixture produced by blending the above-mentioned flows and monitoring the lifetime of the relatively low gas temperature after droplets passes through the observation area. The scientific novelty of this research comes from the first ever comparison of the temperature measurements of a gas–vapor–droplet mixture obtained by contact and non-contact systems. The advantages and limitations of the contact and non-contact techniques are defined for the measurement of gas–vapor mixture temperature. View Full-Text
Keywords: laser induced phosphorescence; gas–vapor mixture; high-temperature combustion products; droplets; temperature field; unsteady heat transfer laser induced phosphorescence; gas–vapor mixture; high-temperature combustion products; droplets; temperature field; unsteady heat transfer
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MDPI and ACS Style

Volkov, R.S.; Voytkov, I.S.; Strizhak, P.A. Temperature Fields of the Droplets and Gases Mixture. Appl. Sci. 2020, 10, 2212.

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