Water Droplet With Carbon Particles Moving Through High-Temperature Gases

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Roman S. Volkov ◽  
Maxim V. Piskunov ◽  
Genii V. Kuznetsov ◽  
Pavel A. Strizhak
Keyword(s):  
High Temperature ◽  
Water Droplet ◽  
Solid Particles ◽  
Optical Methods ◽  
Solid Inclusion ◽  
Two Phase ◽  
Carbon Particles ◽  
Liquid Evaporation ◽  
Liquid Flows ◽  
Particle Imaging

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.

scholarly journals Experimental investigation of evaporation enhancement for water droplet containing solid particles in flaming combustion area

2016 ◽  
Vol 20 (1) ◽  
pp. 131-141 ◽  
Author(s):  
Dmitrii Glushkov ◽  
Genii Kuznetsov ◽  
Pavel Strizhak ◽  
Roman Volkov
Keyword(s):  
Water Droplet ◽  
Mass Transfer Process ◽  
Solid Particles ◽  
Optical Methods ◽  
Maximum Efficiency ◽  
Water Evaporation ◽  
Two Phase ◽  
Carbon Particles ◽  
Fire Extinguishing ◽  
Flaming Combustion

The experimental study of integral characteristics of extinguishing liquid (water) droplet evaporation in flaming combustion area has been held. Optical methods of two-phase and heterogeneous mixtures diagnostics (?Particle Image Velocimetry? and ?Interferometric Particle Imaging?) have been used for heat and mass transfer process investigation. It was established that small-size solid particles (for example, carbon particles) in droplet structure can enhance water evaporation in flame area. It was shown that the rate of evaporation process depends on concentration and sizes of solid particles in a water droplet. The correlations have been determined between the sizes of solid particles and water droplets for maximum efficiency of fire extinguishing. The physical aspects of the problem have been discussed.

scholarly journals Investigation of Regularities of Heat and Mass Transfer and Phase Transitions during Water Droplets Motion through High-Temperature Gases

2014 ◽  
Vol 6 ◽  
pp. 865856 ◽  
Author(s):  
Roman S. Volkov ◽  
Olga V. Vysokomornaya ◽  
Genii V. Kuznetsov ◽  
Pavel A. Strizhak
Keyword(s):  
Mass Transfer ◽  
Phase Transitions ◽  
High Temperature ◽  
Heat And Mass Transfer ◽  
Water Droplet ◽  
Small Neighborhood ◽  
Droplet Evaporation ◽  
Optical Methods ◽  
Water Droplets ◽  
Two Phase

The macroscopic regularities of heat and mass transfer and phase transitions during water droplets motion through high-temperature (more than 1000 K) gases have been investigated numerically and experimentally. Water droplet evaporation rates have been established. Gas and water vapors concentrations and also temperature values of gas-vapor mixture in small neighborhood and water droplet trace have been singled out. Possible mechanisms of droplet coagulation in high-temperature gas area have been determined. Experiments have been carried out with the optical methods of two-phase gas-vapor-droplet mixtures diagnostics (“Particle Image Velocimetry” and “Interferometric Particle Imaging”) usage to assess the adequateness of developed heat and mass transfer models and the results of numerical investigations. The good agreement of numerical and experimental investigation results due to integral characteristics of water droplet evaporation has been received.

Experimental Characterization of Slug Flow on Solid Particle Transport in a 1 Deg Upward Inclined Pipeline

2013 ◽  
Vol 135 (8) ◽  
Author(s):  
Afshin Goharzadeh ◽  
Peter Rodgers ◽  
Liang Wang
Keyword(s):  
Solid Particle ◽  
Solid Particles ◽  
Particle Suspension ◽  
Two Phase ◽  
Horizontal Orientation ◽  
Suspension Layer ◽  
Load Mode ◽  
Gas Liquid Flow ◽  
Liquid Flows ◽  
Pipe Inclination

This paper presents an experimental investigation on the influence of hydraulic and two phase (gas-liquid) flows on sand dune transportation resulting from a stationary flatbed, for horizontal and 1 deg upward pipe inclination. For gas-liquid conveying of solid particles, pipe inclination resulted in considerably different transport phenomena relative to those observed for horizontal orientation. Key distinguishing features such as backward bed movement and enhanced particle suspension were observed and were found to be highly gas-liquid ratio dependent. Using image processing, the solid particle suspension layer was quantified as a function of the gas-liquid flow. The measurements presented provide fundamental insights into the influence of upward pipe inclination on bed-load mode solid transportation in a closed conduit.

Experimental Study on Contact Angle of Water Droplet in High-Temperature Condition

2006 ◽  
Author(s):  
Yoshinori Hirose ◽  
Tsukasa Hayashi ◽  
Tatsuya Hazuku ◽  
Tomoji Takamasa
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Water Droplet ◽  
Contact Angles ◽  
Point Of View ◽  
Surface Wettability ◽  
Atmospheric Gases ◽  
Two Phase ◽  
Test Plate ◽  
High Temperature Condition

In recent decades, a number of reports have pointed out the importance of the influence of wall wettability on gas-liquid two-phase flow with a gas-liquid or liquid-gas phase change. However, very limited experimental data can be obtained about the wall surface wettability in BWRs high-temperature condition, or in the range from 250 to 300°C. From this point of view, we conducted an experimental study of surface wettability of droplet using a pressure vessel, we measured contact angles of water droplet under various ambient pressures (7.7, 14 and 15 MPa), atmospheric gases (nitrogen and argon), and test plate materials (aluminum, stainless 304, Zircaloy). In addition, experimental correlation was derived based on energy balance. The data obtained in this study will provide more accurate assessment of heat transfer in subchannels of BWRs.

Conditions of Intensive Evaporation of Heterogeneous Water Droplet in High Temperature Gas Environment

2015 ◽  
Vol 32 (3) ◽  
pp. 349-355 ◽  
Author(s):  
O. V. Vysokomornaya ◽  
G. V. Kuznetsov ◽  
P. A. Strizhak
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
High Temperature ◽  
Water Droplet ◽  
Sufficient Conditions ◽  
Solid Inclusion ◽  
Necessary And Sufficient ◽  
Heating Up ◽  
System Water ◽  
High Temperature Gas

AbstractThe results of a numerical simulation of heat and mass transfer during evaporation of a water droplet with solid inclusion in air at temperature as high as 1000K are presented. Typical heating steps of droplet until it reaches the conditions of intensive evaporation (i.e.the interface “solid inclusion – liquid” reaches the boiling temperature) are described. The roles played by the external air temperature and by the main properties of inclusion are detailed. The droplet size, the relation between the sizes of inclusion and a liquid layer during the heating up is determined. The necessary and sufficient conditions of intensive evaporation in the system “water droplet with solid inclusion in high-temperature air” are pointed out.

scholarly journals Explosive Breakup of a Water Droplet with a Nontransparent Solid Inclusion Heated in a High-Temperature Gaseous Medium

2015 ◽  
Vol 23 ◽  
pp. 01064 ◽  
Author(s):  
Margarita A. Dmitrienko ◽  
Maxim V. Piskunov ◽  
Pavel A. Strizhak ◽  
Anastasia A. Shcherbinina
Keyword(s):  
High Temperature ◽  
Water Droplet ◽  
Gaseous Medium ◽  
Solid Inclusion

scholarly journals Influence of radiative heat and mass transfer mechanism in system “water droplet-high-temperature gases” on integral characteristics of liquid evaporation

2015 ◽  
Vol 19 (5) ◽  
pp. 1541-1552 ◽  
Author(s):  
Dmitrii Glushkov ◽  
Genii Kuznetsov ◽  
Pavel Strizhak
Keyword(s):  
Mass Transfer ◽  
High Temperature ◽  
Heat And Mass Transfer ◽  
Water Droplet ◽  
Radiative Heat ◽  
Transfer Mechanism ◽  
Water Droplets ◽  
Mass Transfer Mechanism ◽  
Integral Characteristics ◽  
Liquid Evaporation

Physical and mathematical (system of differential equations in private derivatives) models of heat and mass transfer were developed to investigate the evaporation processes of water droplets and emulsions on its base moving in high-temperature (more than 1000 K) gas flow. The model takes into account a conductive and radiative heat transfer in water droplet and also a convective, conductive and radiative heat exchange with high-temperature gas area. Water vapors characteristic temperature and concentration in small wall-adjacent area and trace of the droplet, numerical values of evaporation velocities at different surface temperature, the characteristic time of complete droplet evaporation were determined. Experiments for confidence estimation of calculated integral characteristics of processes under investigation - mass liquid evaporation velocities were conducted with use of cross-correlation recording video equipment. Their satisfactory fit (deviations of experimental and theoretical velocities were less than 15%) was obtained. The influence of radiative heat and mass transfer mechanism on characteristics of endothermal phase transformations in a wide temperature variation range was established by comparison of obtained results of numerical simulation with known theoretical data for ?diffusion? mechanisms of water droplets and other liquids evaporation in gas.

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

Heat Transfer Processes in High-Temperature Flows of Two-Phase Media

2001 ◽  
Vol 32 (7-8) ◽  
pp. 7
Author(s):  
M. I. Osipov ◽  
K. A. Gladoshchuk ◽  
A. N. Arbekov
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Two Phase ◽  
Transfer Processes

HAYNES STELLITE ALLOY No. 4

Alloy Digest ◽  
1969 ◽  
Vol 18 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Cast Alloy ◽  
Heat Treating ◽  
Carbon Particles ◽  
Stellite Alloy ◽  
Temperature Performance ◽  
Cobalt Base

Abstract Haynes Stellite No. 4 is a cobalt-base cast alloy recommended for handling severe conditions of abrasion, heat and corrosion. It is especially recommended to resist the severe abrasive and corrosive action of manganese dioxide, carbon particles, and ammonium and zinc chlorides in the battery mix used in the manufacture of dry batteries. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as heat treating, machining, and joining. Filing Code: Co-59. Producer or source: Union Carbide Materials Systems Division.

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