{"title":"Numerical study of turbulent heat transfer and particle deposition in enhanced pipes with helical roughness","authors":"Kevin Akermann, Peter Renze","doi":"10.1016/j.ijmultiphaseflow.2024.104827","DOIUrl":null,"url":null,"abstract":"<div><p>Large-eddy simulations of turbulent heat transfer and solid particle deposition in helically rib-roughened pipe flows have been performed for different Reynolds numbers <span><math><mrow><mi>R</mi><mi>e</mi></mrow></math></span> and various particle diameters <span><math><msub><mrow><mi>D</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span>. 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 <span><math><mrow><mi>N</mi><mi>u</mi></mrow></math></span>, friction factors <span><math><msub><mrow><mi>f</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span>, and particle deposition rates <span><math><msub><mrow><mover><mrow><mi>N</mi></mrow><mrow><mo>̇</mo></mrow></mover></mrow><mrow><mi>d</mi></mrow></msub></math></span> are presented for each geometry variant. For same Reynolds numbers <span><math><mrow><mi>R</mi><mi>e</mi></mrow></math></span>, significant differences of those values have been observed for the differently structured pipes.</p></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":null,"pages":null},"PeriodicalIF":3.6000,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S030193222400106X/pdfft?md5=4b091994e8cc3aeea85dc4033f6cbb7b&pid=1-s2.0-S030193222400106X-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Multiphase Flow","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S030193222400106X","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MECHANICS","Score":null,"Total":0}
引用次数: 0
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 and various particle diameters . 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 , friction factors , and particle deposition rates are presented for each geometry variant. For same Reynolds numbers , significant differences of those values have been observed for the differently structured pipes.
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.