Experimental setup for study of drop deformation in air flow

Experimental study for study of deformation of drops in air flow is considered. Experimental setup includes a module for obtaining the drops, an air flow system and measuring system. Module for formation of drops is in the form of vertically arranged dropper with capillary with the possibility of formation of fixed drops. Air flow supply system comprises an air pump coupled conduit through a regulating valve with a cylindrical pipe, installed coaxially with dropper. The measuring system includes the video camera located with possibility of visualization of drop and the Pitot gage for measurement of flow rate of air located in the output section of branch pipe. This experimental setup allows to provide reliable and informative results of the investigation of deformation of drops in the air flow

Mechanisms of acoustic processing of a metal melt containing nanoparticles

Wave processing with the frequencies from subsound (vibration) to ultrasound is used to produce nanopowder-modified composite alloys. This work considers mechanisms of such processing of metal melts, which lead to deagglomeration and wettability of particles of a metal melt and to the destruction of growing crystals during solidification. The main dependences for the threshold of the turbulence and cavitation were obtained. Resonance phenomena that contribute to positive changes in the melt are discussed. Possible mechanisms of the destruction of growing crystals and agglomerates of particles at the high-frequency processing of the melt are considered, including the destruction of agglomerates in the front of an acoustic wave and the destruction of crystals by oscillating solid particles

Regularities in the structure and properties formation of aluminum-based composites during hot pressing

The purpose of this study is to investigate the phase composition, parameters of fine crystalline structure and mechanical properties of aluminum-based composites, produced by hot pressing with different synthesis temperatures and isothermal times. For synthesis of composites we used powder mixture of aluminum (particles size 700 nm) and carbon powder in a form of nanodiamonds (size 4 nm). It has been shown that after hot press processing a nanophase (crystallites size 25 nm) of aluminum carbide was formed. Regardless of the synthesis temperature for the maximum holding time of powder mixtures, the density of hot-pressed compacts is about 2.2-2.37 g/cm3. In particular, the value of bending strength of composite samples with a density of 2.37 g/cm3 ranges from 350 to 480 MPa. In the nonporous state, the bending strength of the composites may reach 920 MPa

Self-propagating high-temperature synthesis of energetic borides

A promising way to synthesize new energy materials based on refactory inorganic compounds is self-propagating high-temperature synthesis of compositions based on boron compounds. This paper describes a laboratory technology of production of aluminum borides. The experimental results of thermogravimetric analysis and particle size analysis obtained for synthesized powders are given. According to thermogravimetric analysis data the degree of oxidation of obtained powders exceeds 95 %. The experimental data have shown that the development of new compositions of high-energy fuel cells using borides can yield high-quality results in the sphere of solid hypersonic engines

On the possibility to fabricate ceramics using fused deposition modeling

The paper presents a uniquely designed device that enables controlled manufacturing of semi-fabricated products from thermoplastic ceramic suspensions by fused deposition modeling. Sintering of the products yields ceramics with high strength and hardness. We use ceramic aluminum oxide (Al2O3) as an example to prove that additive ceramic structures can be produced without noticeable boundaries between layers of the material

The low-temperature sol-gel synthesis of metal-oxide films on polymer substrates and the determination of their optical and dielectric properties

Photoactive, optically transparent heterostructures from silver nanowires and titanium dioxide were obtained by the sol-gel method on the surface of a polyethylene terephthalate film. The characteristics of optical transmission on the wavelength and those of dielectric permittivity, conductivity and dissipation on frequency in the range of 25–1,000,000 Hz were investigated

Experimental setup for study of drop deformation in air flow

Experimental study for study of deformation of drops in air flow is considered. Experimental setup includes a module for obtaining the drops, an air flow system and measuring system. Module for formation of drops is in the form of vertically arranged dropper with capillary with the possibility of formation of fixed drops. Air flow supply system comprises an air pump coupled conduit through a regulating valve with a cylindrical pipe, installed coaxially with dropper. The measuring system includes the video camera located with possibility of visualization of drop and the Pitot gage for measurement of flow rate of air located in the output section of branch pipe. This experimental setup allows to provide reliable and informative results of the investigation of deformation of drops in the air flow

Experimental Setup For Study of Drop Deformation In Air Flow

Experimental study for study of deformation of drops in air flow is considered. Experimental setup includes a module for obtaining the drops, an air flow system and measuring system. Module for formation of drops is in the form of vertically arranged dropper with capillary with the possibility of formation of fixed drops. Air flow supply system comprises an air pump coupled conduit through a regulating valve with a cylindrical pipe, installed coaxially with dropper. The measuring system includes the video camera located with possibility of visualization of drop and the Pitot gage for measurement of flow rate of air located in the output section of branch pipe. This experimental setup allows to provide reliable and informative results of the investigation of deformation of drops in the air flow

Regularities in the structure and properties formation of aluminum-based composites during hot pressing

The purpose of this study is to investigate the phase composition, parameters of fine crystalline structure and mechanical properties of aluminum-based composites, produced by hot pressing with different synthesis temperatures and isothermal times. For synthesis of composites we used powder mixture of aluminum (particles size 700 nm) and carbon powder in a form of nanodiamonds (size 4 nm). It has been shown that after hot press processing a nanophase (crystallites size 25 nm) of aluminum carbide was formed. Regardless of the synthesis temperature for the maximum holding time of powder mixtures, the density of hot-pressed compacts is about 2.2-2.37 g/cm3. In particular, the value of bending strength of composite samples with a density of 2.37 g/cm3 ranges from 350 to 480 MPa. In the nonporous state, the bending strength of the composites may reach 920 MPa