Effects of Ultrasound on Behavior of Fine Solid Particles in Solid-liquid Mixture (1st Report, Horizontal Irradiation in Stationary Solid-liquid Mixture)

Microwave sintering is new sintering technology method to produce Al alloys. The advantages of this method because of very short sintering time and less production cost compare to conventional sintering. However, the main problems in microwave sintering are required to be controlled sintering time due to rapid sintering mechanism. Therefore the effect of microwave sintering time to PM Aluminium will be studied. The compacted and sintered aluminium powder is placed in a microwave oven at a different period of 5 minutes, 10 minutes, 15 minutes and 20 minutes. Compression of 150 MPa is applied on aluminium powder to form pellets. Palette is shaped to 1cm in diameter and weighs 1g. SiC is placed together with aluminium samples in the microwave for the purpose of absorbing electromagnetic energy and is converted to heat. Results of different period sintering of aluminium pallet production altered physical properties of each sample. For a rapid sintering time, aluminium pallet does not show any binding reaction between powder particles. Whereas, for long microwave sintering period, solid particles phase change into solid-liquid phase caused by the movement and the formation of bonds between particles. Hence, this will be affecting the mechanical properties of the sample material.

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Pressure Drop and Mass Transfer Studies in Liquid Fluidized Beds

Fluids Engineering ◽

10.1115/imece2006-13455 ◽

2006 ◽

Author(s):

Bhagavatula Venkata Ramana Murthy

Keyword(s):

Mass Transfer ◽

Pressure Drop ◽

Liquid Velocity ◽

Water System ◽

Solid Particles ◽

Sugar Water ◽

Minimum Fluidization Velocity ◽

Liquid Systems ◽

Mass Transfer Studies ◽

Solid Liquid

Fluidized beds are widely used in industries for mixing solid particles with liquids as the solid is vigorously agitated by the liquid passing through the bed and the mixing of the solid ensures that there are practically no temperature gradients in the bed even with exothermic or endothermic reactions (Mixing and the segregation in a liquid fluidized of particles with different sizes and densities", The Canadian Journal of Chemical Engineering, 1988). The violent motion of the solid particles also gives high heat transfer rates to the wall or to cooling tubes immersed in the bed. Because of the fluidity of the solid particles, it is easy to pass solid from one vessel to another. In the present experimental work, the relative density between solid and liquid phases on pressure drop under fluidized condition has been studied using the solid-liquid systems namely, glass beads-water, glass beads-kerosene, plastic beads-kerosene and diamond sugar-kerosene. Pressure drop - liquid velocity and void fraction - liquid velocity relationships have been found for all the mentioned solid-liquid systems under fluidized condition and results have been noted. The effect of the nature of the fluid on the minimum fluidization velocity and the pressure drop has been studied. In addition to the pressure drop studies, mass transfer studies have also been conducted with diamond sugar-water system with and without fluidization and results have been obtained. In addition to these, comparison of bed voidage, pressure drop and minimum fluidization velocity between denser and lighter liquids have been studied and the results have been obtained. Also, the value of rate of mass transfer with fluidization is compared that without fluidization for diamond sugar-water system and the results have been obtained.

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Mathematical Modeling of a Solid–Liquid Mixture with Mass Exchange Between Constituents

Mathematics and Mechanics of Solids ◽

10.1177/1081286505052339 ◽

2006 ◽

Vol 11 (6) ◽

pp. 575-595 ◽

Cited By ~ 2

Author(s):

L. Fusi ◽

A. Farina ◽

D. Ambrosi

Keyword(s):

Mathematical Modeling ◽

Liquid Mixture ◽

Solid Phase ◽

Deformation Gradient ◽

Elastic Solid ◽

Solid Deformation ◽

Solid Stress ◽

Phase Deformation ◽

Mass Conversion ◽

Solid Liquid

The mechanical behavior of a mixture composed by an elastic solid and a fluid that exchange mass is investigated. Both the liquid flow and the solid deformation depend on how the solid phase has increased (diminished) its mass, i.e. on the mass conversion between constituents. The model is developed introducing a decomposition of the solid phase deformation gradient. In particular, exploiting the criterion of maximization of the rate of entropy production, we determine an explicit evolution equation for the so-called growth tensor which involves directly the solid stress tensor. An example of a possible choice of the constitutive functions is also presented.

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Measuring Solid-Liquid Mixture in Closed Conduits

Journal of the Waterways and Harbors Division ◽

10.1061/jwheau.0000595 ◽

1968 ◽

Vol 94 (4) ◽

pp. 453-464

Author(s):

Richard N. Weisman ◽

Walter H. Graf

Keyword(s):

Liquid Mixture ◽

Solid Liquid

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Modeling evaluation on solid-liquid mixing characteristics in a dislocated guide impeller stirred tank

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2021-0147 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Deyin Gu ◽

Fenghui Zhao ◽

Xingmin Wang ◽

Zuohua Liu

Keyword(s):

Power Consumption ◽

Solid Particle ◽

Particle Diameter ◽

Solid Particles ◽

Stirred Tank ◽

Mixing Process ◽

Solid Holdup ◽

Aperture Ratio ◽

Liquid Mixing ◽

Solid Liquid

Abstract The solid-liquid mixing characteristics in a stirred tank with pitched blade impellers, dislocated impellers, and dislocated guide impellers were investigated through using CFD simulation. The effects of impeller speed, impeller type, aperture ratio, aperture length, solid particle diameter and initial solid holdup on the homogeneity degree in the solid-liquid mixing process were investigated. As expected, the solid particle suspension quality was increased with an increase in impeller speed. The dislocated impeller could reduce the accumulation of solid particles and improve the cloud height compared with pitched blade impeller under the same power consumption. The dislocated guide impeller could enhance the solid particles suspension quality on the basis of dislocated impeller, and the optimum aperture ratio and aperture length of dislocated guide impeller were 12.25% and 7 mm, respectively, in the solid-liquid mixing process. Smaller solid particle diameter and lower initial solid holdup led to higher homogeneity degree of solid-liquid mixing system. The dislocated guide impeller could increase solid particle integrated velocity and enhance turbulent intensity of solid-liquid two-phase compared with pitched blade impeller and dislocated impeller under the same power consumption.

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Solid–liquid two-phase flow and erosion calculation of butterfly valves at small opening based on DEM method

Industrial Lubrication and Tribology ◽

10.1108/ilt-07-2020-0264 ◽

2020 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Benliang Xu ◽

Zuchao Zhu ◽

Zhe Lin ◽

Dongrui Wang

Keyword(s):

Peer Review ◽

Two Phase Flow ◽

Solid Particles ◽

Phase Flow ◽

Butterfly Valve ◽

Two Phase ◽

Content Type ◽

Small Opening ◽

Solid Liquid ◽

The Impact

Purpose The study aims to decrease the effect of solid particles on a butterfly valve, which will cause seal failure and leakage, providing a reference for anti-wear design. Design/methodology/approach In this paper, computational fluid dynamics discrete element method (CFD-DEM) simulation was conducted to study the solid–liquid two-phase flow characteristics and erosion characteristics of a butterfly valve with a different opening. Findings Abrasion at 10% opening is affected by high-speed jets in upper and lower parts of the pipeline, where the erosion is intense. The impact of the jet on the upper part of 20% opening begins to weaken. With the top backflow vortex disappearing, the effect of lower jet is enhanced. Meanwhile, the bottom backflow vortex phenomenon is obvious, and the abrasion position moves downward. At 30% opening, the velocity is further weakened, and the circulation effect of lower flow channel is more obvious than that of the upper one. Originality/value It is the first time to use DEM to investigate the two-phase flow and erosion characteristics at a small opening of a butterfly valve, considering the effect of inter-particle collision. Therefore, this study carries on the thorough analysis and discussion. At the same opening degree, with increasing of the particle size, the abrasion of valve frontal surface increases when the size is less than 150 µm and decreases when it is greater than 150 µm. For the valve backflow surface, this boundary value becomes 200 µm. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0264/

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