对不同几何形状的气固流侵蚀进行数值分析，以替代标准弯管

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2024-10-02 DOI:10.1016/j.powtec.2024.120334

Ahmadreza Veiskarami, Maysam Saidi

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引用次数: 0

摘要

这项研究的目的是更换不同几何形状的配件，而不是标准的 90° 弯头，并尝试改变水流模式，以减少侵蚀破坏。在各种管件中，弯头的风险更大。与标准 90° 弯头相比，对目前的侵蚀情况进行了数值研究，对非球形颗粒和颗粒随流体流动的冲击角变化进行了新颖的研究，使用了 8 个新提出的管件，包括 2 个斜接管件、3 个盲接管件、1 个变径弯头管件和 2 个球形弯头管件。采用欧拉-拉格朗日方法对非球形颗粒的气固两相流进行了数值模拟研究。在进行数值模拟研究时，首先利用 Navier-Stokes 方程和湍流雷诺应力模型对气体流动进行建模，然后利用牛顿方程对固体颗粒进行喷射。最后，利用格兰特和塔巴科夫的颗粒撞壁后恢复模型以及奥卡的侵蚀模型计算侵蚀量。研究了流动模式变化引起的侵蚀量，以评估新提出的配件的性能。最临界模式（Vin = 27 m/s，DP = 300 μm）的数值结果表明，与标准 90° 弯头相比，拟议的新管件可将抗侵蚀能力提高 22.5% 至 39.6%。此外，这项研究还调查了不同参数（包括流速、颗粒直径大小、颗粒输入率和颗粒旋转）对侵蚀的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Numerical analysis of gas-solid flow erosion in different geometries as alternatives to a standard pipe elbow

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Numerical analysis of gas-solid flow erosion in different geometries as alternatives to a standard pipe elbow

This study was conducted with the aim of replacing different geometric fittings instead of the standard 90° elbow and trying to change the flow pattern to reduce erosion damage. Among fittings, the elbows are at a more serious risk. Numerical investigation of the present erosion with the novelty of research on non-spherical particles and changes in the impact angle of particles along with fluid flow using eight new proposed fittings, including two miter fittings, three blinded fittings, one reducer elbow fitting, and two spherical elbows fittings in comparison with the standard 90° elbow was controlled. The numerical simulation of the gas-solid two-phase flow of non-spherical particles was studied using the Euler-Lagrange approach. To carry out the study numerical, first, the gas flow was modeled by the Navier-Stokes equations and the turbulent Reynolds stress model, and then the solid particles were injected using Newton's equation. Finally, the erosion was calculated using Grant and Tabakoff model of the restitution of particles of after hitting the wall and the erosion model of Oka. The amount of erosion caused by changes in the flow pattern was investigated to evaluate the performance of the new proposed fittings. Numerical results for the most critical mode (V_in = 27 m/s and D_P = 300 μm) showed that the new proposed fittings increase the erosion resistance by 22.5 % to 39.6 % compared to the standard 90° elbow. Also, in this research, the effect of different parameters including flow velocity, particle diameter size, particle input rate, and particle rotation on erosion were investigated.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.