There is given a common method of calculation of power consumptions for emulsification at systems liquid-liquid in low volume mixing devices (rotary pulsating apparatuses and rotor-disc mixers) in this Article. Named mixing devices shown a high efficiency at processing of liquid-liquid systems and are widely used at chemical processes. It is shown that at determination of energy consumptions it is need to take in account energy dissipation processes, caused by viscous friction forces, which affect a significant influence at high gradients of speeds turbulent motion. It is obtained the ratio, which connects an angular velocity of rotor rotation of mixing device and a characteristic size of dispersed phase particles of a mixing device. There are given an experimental equations of consumed power of rotor-disc mixers on rotor rotations number and characteristic sizes of dispersed particles for th system water and diesel fuel. Also it is known that in decrease of dispersed particles size and in increase of volume consumption of the processed mixture, the consumed power is increase, and it due to the fact by increase energy consumption for creation of interphase surface.
There is given in this thesis a general method of calculation of power consumption for emulgation in systems liquid-liquid in small-size mixing devices (rotor-pulsation apparatuses and rotor-disc mixers). This mixing devices, have shown a high efficiency at processing of liquid-liquid systems and are wide using chemical processes. The base of calculation method is an energy ratio to describe of developed turbulent motion, pulsation intensity of which is enough for create of dispersed particles of given size and concentration, which provide a necessary surface of phases contact. It is shown, that in determination of energy consumption it is need to take in account energy dissipation processes, due to viscous friction forces, which have a significant influence at high gradients of turbulent motion. There is obtained a ratio, which connects an angular velocity of rotor rotation of mixing device and a characterized size of dispersed phase particles.There is given an experimental dependencies of consumed power of rotor-disc mixers on rotor rotations number of mixing device and characterized sizes of dispersed particles for systems water-diesel fuel. It was determined, that are decreasing of dispersed particles sizes and in increasing of volumetric flow of processing mixture a value of consumed power increases, and it is related with by increase of energy consumption for creating of interphase surface. It was determined, that a power, consumed by rotor-disc mixer, for emulsion making with averaged dispersion size of particles at range 5-25 mkm, increases by increase of rotation numbers ~n0.37. Comparison of theoretical equations and experimental data have shown adequacy of supposed calculation method of energy consumption.
This article provides an overview of the design of a two-stage rotary crushing mixer and describes the principle of operation. It has been experimentally proven that the use of a two-stage rotary crushing mixer, in comparison with a single-stage apparatus, leads to a significant increase in the quality of the mixture and productivity. It was found that to create an emulsion with a certain size of dispersed particles, a two-stage apparatus consumes less power, this is explained by the fact that in a single-stage apparatus, to achieve the specified size of dispersed particles, the processing time of the mixture increases, and therefore energy consumption increases. In addition, the specific power consumption of the two-stage apparatus is less than the sum of the capacities of the two single-stage apparatus, which indicates a higher energy efficiency of the proposed design of RCM. Expressions(formulas) are given for determining the dissipated energy and power required for carrying out the mixing process, taking into account the design parameters of the apparatus, the properties of the media. It is shown that the power consumption for mixing is determined by the energy required for crushing emulsion droplets in a turbulent flow and energy dissipation due to viscous friction processes.
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