Effect of Monodisperse Coal Particles on the Maximum Drop Spreading after Impact on a Solid Wall

Alexander Ashikhmin, Nikita Khomutov, Roman Volkov, Maxim Piskunov () and Pavel Strizhak
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Alexander Ashikhmin: Heat Mass Transfer Laboratory, School of Energy & Power Engineering, National Research Tomsk Polytechnic University, 30 Lenin Ave., 634050 Tomsk, Russia
Nikita Khomutov: Heat Mass Transfer Laboratory, School of Energy & Power Engineering, National Research Tomsk Polytechnic University, 30 Lenin Ave., 634050 Tomsk, Russia
Roman Volkov: Heat Mass Transfer Laboratory, School of Energy & Power Engineering, National Research Tomsk Polytechnic University, 30 Lenin Ave., 634050 Tomsk, Russia
Maxim Piskunov: Heat Mass Transfer Laboratory, School of Energy & Power Engineering, National Research Tomsk Polytechnic University, 30 Lenin Ave., 634050 Tomsk, Russia
Pavel Strizhak: Heat Mass Transfer Laboratory, School of Energy & Power Engineering, National Research Tomsk Polytechnic University, 30 Lenin Ave., 634050 Tomsk, Russia

Energies, 2023, vol. 16, issue 14, 1-18

Abstract: The effect of coal hydrophilic particles in water-glycerol drops on the maximum diameter of spreading along a hydrophobic solid surface is experimentally studied by analyzing the velocity of internal flows by Particle Image Velocimetry (PIV). The grinding fineness of coal particles was 45–80 μm and 120–140 μm. Their concentration was 0.06 wt.% and 1 wt.%. The impact of particle-laden drops on a solid surface occurred at Weber numbers ( We ) from 30 to 120. It revealed the interrelated influence of We and the concentration of coal particles on changes in the maximum absolute velocity of internal flows in a drop within the kinetic and spreading phases of the drop-wall impact. It is explored the behavior of internal convective flows in the longitudinal section of a drop parallel to the plane of the solid wall. The kinetic energy of the translational motion of coal particles in a spreading drop compensates for the energy expended by the drop on sliding friction along the wall. At We = 120, the inertia-driven spreading of the particle-laden drop is mainly determined by the dynamics of the deformable Taylor rim. An increase in We contributes to more noticeable differences in the convection velocities in spreading drops. When the drop spreading diameter rises at the maximum velocity of internal flows, a growth of the maximum spreading diameter occurs. The presence of coal particles causes a general tendency to reduce drop spreading.

Keywords: coal particle; drop impact; maximum spreading; PIV; slurry; velocity field (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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