Highlights • Development of a coupled CFD-DEM to examine oscillatory solid-gas flows in porous media. • Comparison of particulate fouling under steady-flow conditions and oscillatory-flow conditions. • Particulate fouling based on various foulant injection rates and foulant densities was investigated. • The 3-pore configuration showed higher fouling at specific frequencies. • The 5 Hz frequency exhibits superior fouling mitigation properties. Abstract A coupled finite volume-discrete element (FVM-DEM) numerical method is developed to investigate oscillating multiphase foulant-laden air (solid-gas) flow and particulate fouling in a porous heat exchanger channel comprising an array of circular cylinders. Oscillatory fluids serve as a steppingstone to advance existing conventional anti-fouling techniques and to yield optimum energy consumption. A performance evaluation criteria based on various amplitudes of pulsation and foulant injection rates is established. The fouling characteristics and pressure drop is compared against a non-oscillating steady flow. For the solid foulant particles considered in this study, the results show that the time-averaged deposition fraction is sensibly invariant with increasing foulant injection rate; however, the same observation is not realized for steady-flow cases. The 1 Hz case showed no significant disparity in terms of deposition fraction at high injection rates compared with the non-oscillating steady flow case. In addition, the 1 Hz case showed miniscule reduction of low-density foulants. The higher-frequency spectrum has superior fouling mitigation capabilities although comparatively higher pressure drop is generated. The 6-pore configuration outperforms the 3-pore under certain oscillatory flow conditions. An optimum frequency of 5 Hz exhibits superior fouling mitigation performance while achieving a low time-averaged pressure drop.

中文翻译：

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通过多孔金属泡沫换热器的带有颗粒的振荡流体流动的耦合 CFD-DEM 模拟：减轻颗粒污染

亮点 • 开发耦合 CFD-DEM 以检查多孔介质中的振荡固体气流。• 稳定流条件和振荡流条件下的颗粒污染比较。• 研究了基于各种污垢注入速率和污垢密度的颗粒污垢。• 3 孔配置在特定频率下显示出更高的污垢。• 5 Hz 频率表现出卓越的防污性能。摘要 开发了耦合有限体积离散元 (FVM-DEM) 数值方法来研究包含一系列圆柱体的多孔换热器通道中的振荡多相污染空气（固气）流和颗粒污垢。振荡流体是推进现有传统防污技术和产生最佳能源消耗的垫脚石。建立了基于各种脉动幅度和污垢注入率的性能评估标准。结垢特性和压降与非振荡稳定流进行比较。对于本研究中考虑的固体污垢颗粒，结果表明，随着污垢注入速率的增加，时间平均沉积分数明显保持不变；然而，对于稳定流情况没有实现相同的观察。与非振荡稳定流情况相比，1 Hz 情况在高注入速率下的沉积分数方面没有显着差异。此外，1 Hz 的案例显示低密度污垢的微乎其微的减少。尽管产生相对较高的压降，但较高频谱具有优异的结垢缓解能力。在某些振荡流动条件下，6 孔配置优于 3 孔配置。5 Hz 的最佳频率显示出卓越的污垢缓解性能，同时实现低时间平均压降。