Characterization of Mixing in a Simple Paddle Mixer Using Experimentally Derived Velocity Fields

Bohl, Douglas; Mehta, Akshey; Santitissadeekorn, Naratip; Bollt, Erik M.

doi:10.1115/1.4004086

Cited by 6 publications

(5 citation statements)

References 33 publications

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“…In [5], the flow field in a cylindrical container driven by an impeller with flat blades was considered. The studies were performed using particle imaging velocimetry (PIV).…”

Section: Introductionmentioning

confidence: 99%

“…Based on the results of the analysis [1][2][3][4][5][6][7][8][9][10], it can be concluded that the reasonable choice of the material of the blades is not represented properly, which is especially important in the design of mixers. Mixer blades during operation are in a state of abrasive friction and their durability is determined by the quality of the alloy from which they are made.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical model of the mechanical properties of Ti-alloyed hypoeutectic cast iron for mixer blades

et al. 2021

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The object of research is hypoeutectic cast iron intended for cast parts operating under abrasive friction conditions. Such parts are mixer blades, the operational properties of which include durability, assessed by abrasion resistance and strength. To give the blades such properties, cast irons, which are materials of the blades, are alloyed with elements that contribute to the formation of carbides of various compositions. The main problem that impedes the targeted selection of materials for mixer blades or finished blades from different materials or different chemical composition is the lack of substantiated selection criteria. If the shipment is carried out only with the provision of data on the chemical composition of the alloy, it is necessary to be able to evaluate the expected mechanical properties, in particular abrasion resistance and strength. Using the methods of regression analysis, a mathematical model has been obtained that includes two regression equations, which allows for a targeted selection of the chemical composition that provides the maximum possible value of mechanical properties – ultimate strength and coefficient of wear resistance. Optimization of the chemical composition, carried out according to this model, made it possible to determine the following chemical composition: C=2.94 %, Ceq=3.3 %, Ti=1.56 %, providing the maximum ultimate strength σb=391 MPa; C=2.78 %, Ceq=3.14 %, Ti=1.61 %, providing a maximum wear resistance coefficient Kwr=12 %. In the case of priority of the strength criterion, the calculated optimal chemical composition makes it possible to reduce the mass-dimensional characteristics of the mixing units of the mixers. A procedure is proposed for using this model to select a batch of blades with the expected best performance properties

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“…In [5], the flow field in a cylindrical container driven by an impeller with flat blades was considered. The studies were performed using particle imaging velocimetry (PIV).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mathematical model of the mechanical properties of Ti-alloyed hypoeutectic cast iron for mixer blades

et al. 2021

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“…Mixing conditions affect the resistance of the blades, so the results of modeling during mixing of various media by the discrete element method (DEM) [2,3], Advanced DEM-CFD [4] or particle imaging velocimetry (PIV) [5] are of interest. In addition, it should be noted analytical methods for constructing blade profiles [6], which make it possible to determine rational parameters and geometric characteristics of the profile, which improve the quality of mixing.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the composition of cast iron for cast parts operating under abrasive friction, according to the criterion of maximum wear resistance

Barsuk

2022

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The object of research: Titanium-alloyed hypoeutectic iron for mixer blades operating under abrasive friction conditions. Investigated problem: selection of the optimal titanium content in the alloy according to the criterion of the maximum wear resistance coefficient. The main scientific results: the content of titanium in cast iron was determined, which provides the maximum wear resistance coefficient with various compositions of the base alloy. It has been established that with the same titanium content, the highest value of the wear resistance coefficient depends on the carbon content and the position of the eutectic point on the Fe-C state diagram. In the studied range, the highest values of the wear resistance coefficient correspond to the average range of variation of these factors. This allows to say that the effect of carbon content and the position of the eutectic point doubly affect wear resistance at the same titanium content, and there is a range of titanium content in which the effect of these factors on the wear resistance value becomes the same. The area of practical use of the results of the study: the results obtained can be used by designers of industrial enterprises choosing materials for the manufacture of machine parts subject to intense friction due to operating conditions. The wear caused by this friction leads to the failure of the blades, so the designer's task is to choose the one that maximizes the durability of the blades. Innovative technological product: wear-resistant hypoeutectic cast iron alloyed with titanium for cast parts operating in conditions of intense abrasive friction The scope of the technological innovative product: mixing plants of various types, mainly used in road construction, construction and agriculture.

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“…In the present study, WCSPH method, improved by using pressure velocity‐decoupling, advanced second‐order discretization, and shifting algorithm, is introduced and used to simulate the mixing phenomena in a cylindrical paddle mixer. Regardless of the scales at which the fluid mixing occurs, this kind of mixer has widely been investigated by using experimental and numerical methods . The stirred vessels have also widely been investigated .…”

Section: Introductionmentioning

confidence: 99%

Lagrangian simulation and analysis of the micromixing phenomena in a cylindrical paddle mixer using a modified weakly compressible smoothed particle hydrodynamics method

Shamsoddini

Sefid

Fatehi

2014

Asia-Pacific J Chem Eng

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In the present study, a robust modified weakly compressible smoothed particle hydrodynamics (SPH) method is introduced in order to examine the micromixing phenomena within a cylindrical paddle mixer. Because it has a Lagrangian nature and it is based on particles, smoothed particle hydrodynamics is an appropriate and convenient method for simulating the moving boundary problems and tracking the particles in the mixing process. The present study thus introduces a convenient SPH method for modelling the mixing process. The straight and cross-shaped blades are considered, and the effects of the fixed rotation, planetary motion of the blade, and position of the blade on the mixing rate are studied.

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Characterization of Mixing in a Simple Paddle Mixer Using Experimentally Derived Velocity Fields

Cited by 6 publications

References 33 publications

Mathematical model of the mechanical properties of Ti-alloyed hypoeutectic cast iron for mixer blades

Mathematical model of the mechanical properties of Ti-alloyed hypoeutectic cast iron for mixer blades

Optimization of the composition of cast iron for cast parts operating under abrasive friction, according to the criterion of maximum wear resistance

Lagrangian simulation and analysis of the micromixing phenomena in a cylindrical paddle mixer using a modified weakly compressible smoothed particle hydrodynamics method

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