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

Article Chemistry, Applied

Atomization behavior of composite liquid fuels based on typical coal processing wastes

G. V. Kuznetsov et al.

Summary: The study explored the potential of using typical coal processing wastes as fuel and the application of waste-to-energy combustion to solve environmental, economic, and energy problems.

FUEL PROCESSING TECHNOLOGY (2022)

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Article Thermodynamics

Effects of wall temperature and temperature-dependent viscosity on maximum spreading of water-in-oil emulsion droplet

Maxim Piskunov et al.

Summary: This study focuses on the spreading dynamics of droplets in n-decane and water-in-oil emulsions stabilized by different nonionic surfactants. The research identifies five hydrodynamic outcomes of droplet impact on a heated surface and proposes a universal empirical model for maximum droplet spreading diameter. The model takes into account temperature-dependent dynamic viscosity, surface tension, and explicit impact surface temperature term. The findings have significant implications for modeling fuel-air mixture formation in combustion chambers.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2022)

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Article Thermodynamics

Dynamic and kinematic characteristics of unsteady motion of a water-in-oil emulsion droplet in collision with a solid heated wall under conditions of convective heat transfer

Alexandra Semyonova et al.

Summary: This paper presents experimental results on the spreading, fingering, and corona-like splashing of water-in-oil emulsion droplets in collision with a solid surface. The effects of Weber numbers, wall temperatures, and the assumptions explaining the behavior of the maximum spreading diameter of emulsion droplets are examined. The results provide insights into predicting the behavior of the corona based on the relationship between the viscous dissipation of the spreading liquid and the energy transferred to the liquid from the wall.

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2022)

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Article Mechanics

Unsteady convective flow of a preheated water-in-oil emulsion droplet impinging on a heated wall

Maxim Piskunov et al.

Summary: This work proposes a mechanism that considers the vortex motion of a liquid inside an emulsion droplet during its collision with a wall. The motion of the liquid leads to increased dissipative energy losses, which affect spreading, corona splashing, and droplet relaxation. The study also found that the equilibrium shape of the droplet during liquid relaxation is influenced by the temperatures of the liquid and wall.

PHYSICS OF FLUIDS (2022)

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Article Thermodynamics

Using Planar Laser Induced Fluorescence and Micro Particle Image Velocimetry to study the heating of a droplet with different tracers and schemes of attaching it on a holder

R. S. Volkov et al.

Summary: The study focuses on measuring droplet temperature field with Planar Laser Induced Fluorescence and natural convection velocities with Micro Particle Image Velocimetry. It analyzes the influence of different tracer particles and holder materials on the temperature and convection velocities of droplets, as well as compares the reliability of different measurement techniques. The findings are essential for advancing research in heating characteristics of droplets, films, and liquid jets.

INTERNATIONAL JOURNAL OF THERMAL SCIENCES (2021)

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Article Energy & Fuels

Rheological characteristics and stability of fuel slurries based on coal processing waste, biomass and used oil

G. Kuznetsov et al.

Summary: The experimental research findings on fuel slurries show that adding up to 10% used oil or wood sawdust can increase slurry viscosity by 50-70%, but exceeding 5% and 10% shares of oil and biomass respectively results in loss of fluidity. The mass fraction of solid part in fuel based on coal sludge should be limited to around 55%. Evaluation indicates that fuel mixtures based on coal sludge and water are the most preferable ones.

FUEL (2021)

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Article Thermodynamics

Secondary atomization of water-in-oil emulsion drops impinging on a heated surface in the film boiling regime

Maxim Piskunov et al.

Summary: The study investigates secondary atomization resulting from the impact of a water-in-oil emulsion drop on a hot sapphire glass surface. It demonstrates that higher emulsion concentrations significantly reduce the size of secondary droplets.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2021)

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Article Materials Science, Multidisciplinary

Recent advances in 3D bioprinting of vascularized tissues

Yi Zhang et al.

Summary: 3D bioprinting technology combines computing science, biology, and material engineering, and has great potential in fabricating vascularized constructs for tissue engineering. This review summarizes recent advances in 3D bioprinting of vascularized tissues, including the selection of biomaterials and various 3D printing techniques and applications.

MATERIALS & DESIGN (2021)

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Article Mechanics

Effect of rheology and interfacial tension on spreading of emulsion drops impacting a solid surface

M. Piskunov et al.

Summary: This study presents an experimental and theoretical investigation of Newtonian and non-Newtonian emulsion drop impact on a solid surface, revealing that existing models underestimate experimental data. The inclusion of capillary effects and careful consideration of rheological properties for Bingham plastic fluids are shown to be important. Modified models provide good agreement with measured data, highlighting the need for further research on the behavior of compound liquid drops impacting solid surfaces.

PHYSICS OF FLUIDS (2021)

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Article Chemistry, Physical

Nanoscopic interactions of colloidal particles can suppress millimetre drop splashing

Marie-Jean Thoraval et al.

Summary: The splashing of a nanoparticle dispersion can be suppressed at higher impact velocities by the interactions of the nanoparticles with the solid surface, opening up new possibilities to deposit large amounts of complex liquids at high speeds.

SOFT MATTER (2021)

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Article Engineering, Chemical