Numerical study of turbulent heat transfer and particle deposition in enhanced pipes with helical roughness

IF 3.6 2区 工程技术 Q1 MECHANICS International Journal of Multiphase Flow Pub Date : 2024-04-18 DOI:10.1016/j.ijmultiphaseflow.2024.104827
Kevin Akermann, Peter Renze
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Abstract

Large-eddy simulations of turbulent heat transfer and solid particle deposition in helically rib-roughened pipe flows have been performed for different Reynolds numbers Re and various particle diameters Dp. An Euler–Lagrange approach, using cyclic boundary conditions for the continuous and the dispersed phase, have been applied to achieve a fully developed turbulent flow. An adhesion and removal model have been added to the multiphase large-eddy simulations to take into account the physical effect of particle re-entrainment. The complex interactions between particle-laden turbulent flow and the structured pipe wall in multiple-started helically ribbed pipes are numerically investigated with regard to heat transfer, pressure loss, and particulate deposition. The results of the Nusselt numbers Nu, friction factors fd, and particle deposition rates Ṅd are presented for each geometry variant. For same Reynolds numbers Re, significant differences of those values have been observed for the differently structured pipes.

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带螺旋粗糙度的增强管道中的湍流传热和颗粒沉积的数值研究
针对不同雷诺数 Re 和不同颗粒直径 Dp,对螺旋肋骨粗化管道流中的湍流传热和固体颗粒沉积进行了大涡流模拟。采用欧拉-拉格朗日方法,对连续相和分散相使用循环边界条件,以实现充分发展的湍流。在多相大涡流模拟中加入了粘附和去除模型,以考虑颗粒再吸附的物理效应。数值研究了多起动螺旋肋形管道中充满颗粒的湍流与结构化管壁之间复杂的相互作用,包括传热、压力损失和颗粒沉积。结果显示了每种几何变量的努塞尔特数 Nu、摩擦因数 fd 和颗粒沉积率 Ṅd。对于相同的雷诺数 Re,不同结构的管道在这些数值上存在显著差异。
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来源期刊
CiteScore
7.30
自引率
10.50%
发文量
244
审稿时长
4 months
期刊介绍: The International Journal of Multiphase Flow publishes analytical, numerical and experimental articles of lasting interest. The scope of the journal includes all aspects of mass, momentum and energy exchange phenomena among different phases such as occur in disperse flows, gas–liquid and liquid–liquid flows, flows in porous media, boiling, granular flows and others. The journal publishes full papers, brief communications and conference announcements.
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