Turbine Mixers Research Articles

МОДЕЛИРОВАНИЕ И РАСЧЕТ КОНСТРУКТИВНЫХ И РЕЖИМНЫХ ПАРАМЕТРОВ ТУРБИННОЙ МЕШАЛКИ ДЛЯ ДИСПЕРГИРОВАНИЯ РАСТВОРОВ ПОЛИМЕРНЫХ КОМПОЗИТОВ

Mixers with technical characteristics established by GOST 20680-2002 are not suitable for mixing solutions of polymer nanocomposites when restoring bearing fits. The optimal design parameters of a multi-bladed turbine mixer with full-length inclined blades for mixing solutions of polymer nanocomposites were determined at the Lipetsk State Technical University. Formulas for calculating the pumping effect and power when designing multi-blade turbine mixers of various sizes are obtained using these parameters. The average value of the peripheral speed coefficient, which is k≈0.92, was determined experimentally. A formula for calculating power when designing multi-blade turbine mixers of various standard sizes with full-length inclined blades is proposed. The experiment showed a high convergence of calculated and actual values of power consumed by a turbine mixer when mixing nanocomposite solutions. An experiment was carried out to evaluate and select a similarity criterion for the design of multi-bladed turbine mixers of various standard sizes. Reynolds and Froude similarity criteria were studied. The light transmission coefficient of the solution after stirring at a rotation frequency determined by the Reynolds criterion is Kc=57%. A similar parameter of the solution after treatment in the mode determined by the Froude criterion is 2.2 times lower and amounts to Kc = 26%. A higher quality index according to the Froude criterion is confirmed by the fact that the strength of the samples is σ = 27.308 MPa, which is 1.24 times greater than the strength of samples obtained from nanocomposite solutions processed in the mode determined by the Reynolds criterion. A formula for calculating the power of multi-bladed turbine mixers with inclined blades was proposed as a result of the research. Modeling of the design and operating parameters of multi-blade turbine mixers of various standard sizes should be carried out according to the Froude criterion.

INVESTIGATION OF THE NEUTRALIZATION PROCESS OF SULFATION PRODUCTS IN THE SURFACTANTS PRODUCTION

The process of sulfation products neutralization in the production of surfactants is not basic, but at this stage the positive effects obtained at the stage of sulfation of organic matter with sulfur trioxide gas are fixed. To preserve the degree of sulfation obtained, it is necessary to carry out the neutralization process under conditions precluding the occurrence of hydrolysis in an acidic medium. The neutralization reaction takes place with a high heat release of about 40 kJ / mol. Analysis of the literature data showed that the neutralization process is not well covered. Little data and hardware and technological design of the process. The process of neutralization in industrial conditions is carried out in apparatus with mechanical turbine mixers, to remove the heat of the exothermic reaction, the paste from the neutralizer is fed into a water-borne heat exchanger and returns to the neutralizer again. The purpose of this study is to determine the optimal technological parameters of the process of neutralization of sulfate products and the development of a mathematical model of this process. The results of experimental studies of the process of sulfation products neutralization with an aqueous solution of sodium hydroxide are presented. During the research, the influence of technological parameters on the quality indicators of neutralization products was determined, the main of which is the degree of sulfation. The optimal technological parameters for carrying out this process in a reactor with a stirrer under laboratory conditions were found. Based on the data obtained in the basis of this process, the use of a continuous-action reactor with a turbine mixer and with a combined heat exchanger. For the transition to an industrial reactor-neutralizer, a mathematical model has been developed, which makes it possible, by means of mathematical modeling, to correct technological parameters in industrial conditions.

INTENSIFICATION OF MIXING OF HETEROGENEOUS FOOD MIXTURES UNDER THE IMPACT OF ULTRASONIC VIBRATIONS

There is known equipment for mixing of heterogeneous food mixtures analyzed in this article. Some part of this equipment provides qualitative mixing at macro-level (mixing of large portions of processed material), for example, paddle, propeller, turbine, anchor, screw, gravitation and drum mixers. Another part of mixing machines on the contrary, allows to achieve of effective micro-level mixing (mutual movements of adjacent particles of material) – vibratory and centrifugal mixers. In some cases there is important to provide well mixing both at macro- and at micro-level, when it is accompanied by thermal, diffusion or chemical processes and from its efficiency depend energy expenses and qualitative characteristics of product. Therefore, a task of elaboration of schemes of improved apparatuses for effective macro- and micro-mixing of dry and liquid multi-component food materials is resolved in the article. Authors are proposing to create these apparatuses at the base of well known equipment – gravitation and screw mixers by way of their additional equipping with serial electromagnetic vibro-exciters of ultrasonic oscillations. As a result, a main drive of a base mixer will provide working process at macro-level and an additional drive – micro-level movements of material particles. The proposed apparatuses have a simple and reliable construction, don’t consist of original parts and at the same time, provide necessary efficiency of working process. Equations of movements of processed components particles in course of their different loading stages, with examination of physical-mechanical properties of the components are also presented in the article. These equations can be used as a base for further creation of methods of design calculation of proposed apparatuses.

The Rationalization of Construction and Operation of the Equipment for the Moulding Sand Preparation

Abstract The rationalization of construction and vibro- fluidised bed coolers and turbine (rotary) mixers, allows for keep sufficiently high quality and increasing their utility values. This concerns optimization of construction and operation to increase the efficiency of their work. The presented research results illustrate a range of the work designed primarily to supplement theoretical foundations of realized processes in industrial devices, including the topics vibro- fluidization , evaporative cooling and refreshing mixing. Presented results concern the investigation of the industrial devices, which is difficult in the practical accomplishment. The part of testing was conducted in real terms of the functioning devices in the industry.

Hydrodynamic characteristics of vessels with dual-tier open turbine mixers

Results of hydrodynamic analysis of vessels with a dual-tier open turbine mixer and four baffle partitions are presented. The velocity distributions obtained in these vessels are in good agreement with qualitative patterns known in the literature. A relationship is proposed for determination of the power factor in these vessels as a function of the diameter of the mixers and the distance between them. The effect of the distances between mixers and their diameter on the dissipation rate of kinetic energy is indicated.

High intensity compounding of mica‐filled thermoplastics

AbstractHigh‐speed turbine mixers have been adapted for compounding filled thermoplastics by the partial flux method. The extreme shearing forces exerted by the mixing impellors simultaneously mixes and delaminates mica fillers to form finely dispersed compounds in a granular, partially fused state which can be directly injection molded without pelletizing. In practice, one turbine mixing unit can be employed for compounding all types of resins and fillers. The partial flux method permits compounding to be accomplished at peak sensor temperatures that are considerably below the resin softening or melting transitions, frequently 50°C less than normal compounding temperatures. The short residence times and reduced energy requirements possible with partial fluxing results in substantial cost reduction without compromising quality or performance. Examples are provided for polypropylene, nylon 66, poly(butene terephthalate), poly(ethylene terephthalate) and poly(phenylene oxide) alloys. Impact modifiers derived from carboxylated polyolefin waxes may be dispersed by the intense shearing action to form highly subdivided submicron particles, which promote crazing and shear deformation during fracture testing, thereby contributing to increased composited toughness with minor sacrifice in modulus and strength. The mechanical properties of micafilled thermoplastics have also been compared with those of short glass fiber composites. In certain applications requiring stiffness and dimensional stability at elevated temperatures, mica composites prepared by intensive mixing in a turbine mixer may be economically substituted for glass fiber counterparts.

MIXING PERFORMANCE OF HIGH SHEAR IMPELLERS

Abstract The characteristics of a high shear impeller, the TURBON mixer, have been extensively investigated. The correlating equation for power requirement of this mixer with three types of impeller has been obtained for a liquid single phase and a gas-liquid two-phase system. The mixing time for liquid single phase and the mass transfer for both gas-liquid and solids-liquid phases in the TURBON mixer have been studied and the results are compared with the data of a conventional turbine mixer. It has been found that the TURBON mixer provides both high shear rate and excellent blending capacity, and therefore the TURBON mixer can be expected to possess a mixing efficiency higher than that of conventional turbine mixers if the advantages of the TURBON mixer are utilized effectively.

Calculation of shafts of two-stage turbine mixers under conditions of shifted vortex

The parameters of the turbine mixers of two-tank extractors are given. Two variations depending on the direction of the rotation of the vortices are specified. A major defect of an extractor of this variant is that the shafts of the mixing devices break as a result of transverse stress which arises from the shift of the central vortex relative to the axis of symmetry. To previous computations of factors, the effect of the second stage, variation of angular liquid rotation speed w /SUB i/ , and radius of vortex zone R /SUB o/ are investigated. These are determined by equations put into computers.

Mass exchange in autoclaves with turbine mixers with automatic intake

Mass exchange in autoclaves with turbine mixers with automatic intake

Shafts of multistage turbine mixers

Shafts of multistage turbine mixers

Power used by multistage open type turbine mixers in extractive phosphoric acid production reactors

Power used by multistage open type turbine mixers in extractive phosphoric acid production reactors

POWER CONSUMPTION OF MIXING IMPELLERS IN BINGHAM PLASTIC LIQUIDS

An experimental equation to estimate power consumption in the mixing of plastic fluids was derived. For ribbon, anchor, turbine and paddle mixers, the following equation was obtained. Np = β(Re)-1 + aNy + 1where Ny (= τy/ρn2d2) is a non-dimensional power number for the yield stress and a is a constant and can be calculated for simple mixers using the following equations. Fnorizontal = 0.58τy, Fvertical = 2.81ryFor turbine and paddle mixers, a drastic transition state was observed between laminar and turbulent regions. In the transition region the periodical generation and disappearance of vortex was observed and the effect was explained by the periodic power consumption of the mixers.

Ten ways we can give you 20 day delivery on turbine mixers.

RETURN TO ISSUEPREVAdvertisementNEXTTen ways we can give you 20 day delivery on turbine mixers.Cite this: Chem. Eng. News 1968, 46, 18, 4Publication Date (Print):April 22, 1968Publication History Published online6 November 2010Published inissue 22 April 1968https://doi.org/10.1021/cen-v046n018.p004Copyright © 1968 American Chemical SocietyArticle Views69Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (346 KB) Get e-Alerts

Model studies on mixers in the viscous flow region

The batch mixing of viscous liquids with rotating agitators was studied in vessels of 0·24 and 1·8-m dia. The quantities measured were power input and mixing time. For mixing time measurement a decolouration and a thermal-response technique were used, both yielding reproducible quantitative data. Seven types of mixers were tested: a flat turbine, inclined-blade paddles, a helical screw, a helical ribbon, a propeller and an anchor agitator. For some agitators, in the region of truly viscous flow, the mixing time was inversely proportion to stirrer speed. The mixers could be compared in terms of two dimensionless numbers based on vessel diameter, liquid viscosity and density, mixing time and power input. The power required to reach a certain mixing time was lowest for the helical screw in a draught tube, with inclined blades or propellers in a draught tube a close second. The turbine and anchor mixers were unsatisfactory for viscous mixing.