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Technical Brief

Water Droplet With Carbon Particles Moving Through High-Temperature Gases

[+] Author and Article Information
Roman S. Volkov, Maxim V. Piskunov, Genii V. Kuznetsov

Department of Heat and Power Process Automation,
National Research Tomsk Polytechnic University,
30, Lenin Avenue,
Tomsk 634050, Russia

Pavel A. Strizhak

Department of Heat and Power Process Automation,
National Research Tomsk Polytechnic University,
30, Lenin Avenue,
Tomsk 634050, Russia
e-mail: pavelspa@tpu.ru

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 21, 2014; final manuscript received July 10, 2015; published online August 11, 2015. Assoc. Editor: Gongnan Xie.

J. Heat Transfer 138(1), 014502 (Aug 11, 2015) (5 pages) Paper No: HT-14-1696; doi: 10.1115/1.4031075 History: Received October 21, 2014

An experimental investigation was carried out on the influence of solid inclusions (nonmetallic particles with sizes from a few tens to hundreds of micrometers) on water droplet evaporation during motion through high-temperature gases (more than 1000 K). Optical methods for diagnostics of two-phase (gas and vapor–liquid) flows (particle image velocimetry (PIV) and interferometric particle imaging (IPI)) were used. It was established that introducing foreign solid particles into the water droplets intensifies evaporation rate in high-temperature gas severalfold. Dependence of liquid evaporation on sizes and concentration of solid inclusion were obtained.

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Figures

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Fig. 1

A schematic illustration of experimental setup: 1—PC; 2—synchronizer of PC, cross-correlation digital camera and laser; 3—laser generator; 4—solid state lasers with ultrashort pulses; 5—cross-correlation digital camera; 6—light pulse; 7—vessel with experimental liquid; 8—channel of experimental liquid supply; 9—dosing device; 10—mount; 11—experimental liquid droplets; 12—cooling liquid line for laser; 13—cylinder of quartz; 14—cuvette with combustible liquid; and 15—thermocouples

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Fig. 2

Videograms of single water droplets (Rd ≈ 3 mm) with carbon particle inclusions of different sizes ((а) Lm = 50–70 μm; (b) Lm = 250–300 μm; (c) Lm = 450–500 μm) at the high-temperature gas area input: 1—droplet and 2—carbon particles

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Fig. 3

Videograms of water droplets (Rd ≈ 3 mm) with carbon particle inclusions of different sizes (Lm = 50–70 μm) at the output from high-temperature gas area

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Fig. 4

Dependence of ΔR parameter on the relative mass fraction of carbon particles γC and initial droplet radius Rd (Lm = 50–70 μm—mean size of carbon particles)

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Fig. 5

Temperature distribution along the radius (5 mm) of spherical carbon particle and water droplet at t = 1 s

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Fig. 6

Dependence of ΔR parameter on the average initial radius Rd of single droplets for water without solid inclusions and water with solid inclusions (Lm = 250–300 μm is mean size of particles; γC≈1% is relative mass fraction of particles)

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Fig. 7

Dependence of ΔR parameter on the characteristic mean size of carbon particles Lm and initial droplet radius Rd (γC ≈ 0.8%—relative mass fraction of particles)

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