CFD-DEM Study of Pleated Filter Plugging Process Based on Porous Media Model

Zhang, Yinhang; Men, Xiuhua; Wang, Shuai; Fu, Xiuli; Chen, Liwen

doi:10.3390/machines10100862

Cited by 3 publications

(2 citation statements)

References 44 publications

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“…The pneumatic conveying process of fine particles through filters was studied in paper [13] using the CFD simulation method. The porous media model and porous structure were used to simulate the airflow state and the blocking effect of fine particles when they flowed through the filter.…”

Section: Heat Exchanger With Sbrcmentioning

confidence: 99%

CFD Modeling of Heat Exchanger with Small Bent Radius Coils Using Porous Media Model

Dmitriev

Kurkin

Dobrov

et al. 2023

Fluids

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The efficiency of heat transfer in air-cooled heat exchangers of various industrial facilities depends on the flow rate of the coolant, its inlet temperature and ambient temperature. These parameters are transient and depend both on the features of the technological process and on weather conditions. One option for a compact design of heat exchangers is the use of close-packed coils with a small bending radius. In this case, heat transfer in the complex geometry of the annular space cannot be described by simple one-dimensional dependencies. To solve this problem, it is necessary to consider the three-dimensional spatial structure of the heat exchange surface. Since the size of the grid elements will be several orders of magnitude less than the size of the facility, the size of the computational grids for CFD modeling full-scale heat exchangers will be billions of finite volumes, and even on powerful supercomputers, the solution time will be about a month. One way to reduce computational costs is to use reduced order models, in which the computational domain is not modeled directly; instead, simplified models, such as a porous medium model, are used to describe it. However, such models require additional closing relations and coefficients that characterize the actual channel geometry. This paper presents a technique for creating a digital twin of a heat exchanger with small bend radius coils based on a porous medium model. The values of heat transfer coefficients and hydraulic resistance depend on the speed of air movement in the space between the coils. The calculated value of the thermal power obtained using the strengthened model was 529 kW, which corresponds to the passport data of 500 kW, with less than 6% deviation for the heat exchanger under study. This confirms the correctness of the calculation with accepted simplifications. The calculation time in this case was only a few minutes when using a personal computer. The developed numerical model allows for the resolution of performance characteristics based on the temperature of the cooled medium at the inlet, air temperature, and fan speed. Analyzing the different modes of turning on the cooling fans made it possible to determine the values of the thermal power when turning off the fans or reducing the number of revolutions.

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Section: Heat Exchanger With Sbrcmentioning

confidence: 99%

CFD Modeling of Heat Exchanger with Small Bent Radius Coils Using Porous Media Model

Dmitriev

Kurkin

Dobrov

et al. 2023

Fluids

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“…Stopping such a large mass of dust requires a filter with a large surface area of filter material (filter paper or composite), which poses an installation problem. In order to reduce the volume occupied by the filter media, the filter paper is pleated, with the parameters of the paper material: pleat height, pleat spacing, pleat shape (flat pleat, V-shaped pleat and corrugated shape), filter paper thickness and airflow velocity having a significant effect on flow resistance [21,22]. The air filter with the optimized sinusoidal filter paper had the lowest pressure drop, and it also provided the lowest exhaust gas temperature of 218 • C and the lowest fuel consumption of 290 g/kWh [21].…”

Section: Introductionmentioning

confidence: 99%

Experimental Testing of Filter Materials for Two-Stage Inlet Air Systems of Internal Combustion Engines

Dziubak

2024

Energies

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This paper presents an experimental study of the effect of the mass of dust retained on a fibrous filter bed operating singly and in a “cyclone-filter-bed” system on changes in filtration efficiency and accuracy, as well as the increase in flow resistance. The research was carried out using a novel and unprecedented method, determining the dust absorption coefficient km of the filter baffle under laboratory conditions. A filtration system built of a single cyclone and a cylindrical filter cartridge with an appropriately sized surface set behind it was studied. Conditions corresponding to the actual operating conditions of the air filter were maintained: dust concentration, filtration speed and dust extraction from the cyclone settling tank. The purpose of the research was to evaluate filter materials with different structures in terms of filtration efficiency and accuracy, as well as flow resistance. The study showed that the parameters of the structure of filter materials—permeability, grammage and thickness—affect the process of retaining dust particles. It was shown that the increase in the flow resistance of the filter bed has a higher intensity when dust grains of small sizes are directed at it, which is the case when the bed is operated behind a cyclone, which separates larger dust grains from the air. There is a reduction in the operating time of the filtration system due to the limitation of the permissible resistance ∆pfdop, and the corresponding dust absorption km has a lower value. For a fixed value of the flow resistance, the dust absorption coefficient km2 of three different filtration baffles AC, B2, and B, working with a cyclone, take values 50–100% smaller than when working in a single-stage system. It has been shown that the “cyclone-filter baffle” unit, due to its greater dust separation capability, allows the filter cartridge to operate for a longer time until a certain flow resistance is reached. This allows the unit to operate longer at lower flow resistance without changing the filter cartridge, thus saving energy. The km values obtained during the tests, using the proposed original method, allow the selection of the filter bed for specific vehicle operating conditions by modelling its course.

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Study on Wear Properties of the Graphite-Sealing Surfaces in a Triple Eccentric Butterfly Valve Based on EDEM-Fluent Coupling

Zhang

Yang

et al. 2023

Machines

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When using valves and pipes, erosion wear is a major issue. Erosion wear can result in equipment shutdown, material replacement, and other issues, as well as the failure of sealing surfaces. The depth of erosion wear is primarily determined by particle velocity, particle size, target material, and use conditions. A combination of the discrete element method (DEM) and computational fluid dynamics (CFD) was used in this study. The dynamic process of particle collision with the sealing surface is also considered. The wear depth was then calculated using Archard’s abrasive wear theory. The erosion wear process of the graphite-sealing surface by gas-solid two-phase flow medium is numerically simulated in a high-temperature triple eccentric butterfly valve using the above theory and method. The erosion wear patterns of graphite-sealing surfaces were investigated under various particle velocities, particle sizes, target materials, and service conditions. The findings indicate that particle velocity and particle size are positively related to wear rate. Soft target wear depth is greater than hard target wear depth. The wear depth decreases as the ambient temperature rises. As a result, graphite has excellent resistance to erosion and wear at high temperatures. When feeding, however, particle velocity and particle size must be considered. The erosion wears characteristics of a high temperature three eccentric butterfly valve investigated in this paper can be used to optimize erosion wear prevention.

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CFD-DEM Study of Pleated Filter Plugging Process Based on Porous Media Model

Cited by 3 publications

References 44 publications

CFD Modeling of Heat Exchanger with Small Bent Radius Coils Using Porous Media Model

CFD Modeling of Heat Exchanger with Small Bent Radius Coils Using Porous Media Model

Experimental Testing of Filter Materials for Two-Stage Inlet Air Systems of Internal Combustion Engines

Study on Wear Properties of the Graphite-Sealing Surfaces in a Triple Eccentric Butterfly Valve Based on EDEM-Fluent Coupling

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