Study of fluid turbulence characteristics and structural evolution in a reciprocating mixing tank

Study of fluid turbulence characteristics and structural evolution in a reciprocating mixing tank | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Study of fluid turbulence characteristics and structural evolution in a reciprocating mixing tank Li Wang, Shibo Wang, Yuling Zhai, Jianxin Xu, qingtai xiao This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4175251/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Reciprocating mixing is a novel mixing technique designed to enhance mixing efficiency. In this method, the mixing paddle moves back and forth along the axial direction periodically, unlike conventional mixing methods. The mixing efficiency of reciprocating stirring can be significantly enhanced compared to conventional stirring. In this thesis, the flow field characteristics and numerical simulation of the Rushton pulp reciprocating mixing tank are analyzed using the Computational Fluid Dynamics (CFD) method with VOF and UDF function control. It has been found that reciprocating mixing increases the overall speed of the fluid by about 8%, the turbulent kinetic energy by 35%-45%, and the turbulent kinetic energy dissipation rate by 10%-16% compared with conventional mixing. Reciprocating mixing significantly affects the tank basin, enhancing the axial flow of the fluid in the tank, disrupting the circulating structure of conventional agitation, and dynamically integrating the multiple flow regions of conventional agitation to improve mixing homogeneity. Additionally, the evolution process of vortex generation, development, and extinction by reciprocal stirring is quantitatively analyzed to determine the optimal size of paddle discs under different conditions. The maximum values of turbulent kinetic energy in the two stirring modes are FS-4/12D and RS-5/12D, respectively. The reason for the abrupt decrease of turbulent kinetic energy in RS-4/12D is explained as follows: The uncaused quadratic flow variance indicates that the reduction of the tail vortex size can effectively destroy the reflux zone, thus reducing the energy consumption at the tail vortex and allowing more energy to be used for fluid mixing. The results of this paper provide a theoretical basis and reference data for the engineering application of reciprocating mixing. reciprocating stirring numerical simulation turbulent energy chaotic properties mixing enhancement Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4175251","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":290723581,"identity":"bb9f4698-391a-47c4-a04d-1c56a295c507","order_by":0,"name":"Li Wang","email":"","orcid":"","institution":"Kunming University of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"Li","middleName":"","lastName":"Wang","suffix":""},{"id":290723582,"identity":"6a250c87-8308-40ca-a46a-eecff77b2c82","order_by":1,"name":"Shibo Wang","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAABCklEQVRIiWNgGAWjYDACCTACAR6GwwwMNvxgdkIB8VrSJBvAWgyI1MLMwHAYooUBjxZz6QbGG4xtdnny/mcPHi6oOC/BL5Gd+OGBAYM8v9gBrFos5xxgtmBsSy42vJGXcHjGmdsSkj1nN0sAHWY4c3YCVi0GNxLYJBi3MSdunMFjcJi37XadwfHeDSAtCQa38WqpT9zYfwak5ZwEkNz8gwgthxPnM+SAtByQANqyDa8tljMSmy0S/x1P3CAB1DLjTDLIL9ssEgwkcPrFXCL54I0PZ6oT5/efMf5cUGEHDLHczTd/VNjI80vjcBgDYwMDSMrgAKqEBFblEC1QIN+AU80oGAWjYBSMdAAALxhf+pQ6tI8AAAAASUVORK5CYII=","orcid":"","institution":"Kunming University of Science and Technology","correspondingAuthor":true,"prefix":"","firstName":"Shibo","middleName":"","lastName":"Wang","suffix":""},{"id":290723583,"identity":"64936180-8c19-44e5-8264-9a239848d572","order_by":2,"name":"Yuling Zhai","email":"","orcid":"","institution":"Kunming University of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"Yuling","middleName":"","lastName":"Zhai","suffix":""},{"id":290723584,"identity":"a0b865dc-6948-45e7-a1bc-26762a8343cc","order_by":3,"name":"Jianxin Xu","email":"","orcid":"","institution":"Kunming University of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"Jianxin","middleName":"","lastName":"Xu","suffix":""},{"id":290723585,"identity":"e3fc9725-979f-4da1-a866-65ffbfc2ae9f","order_by":4,"name":"qingtai xiao","email":"","orcid":"","institution":"Kunming University of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"qingtai","middleName":"","lastName":"xiao","suffix":""}],"badges":[],"createdAt":"2024-03-27 10:15:31","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-4175251/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-4175251/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":60472212,"identity":"f3a837a4-036a-4587-b054-b29f992265de","added_by":"auto","created_at":"2024-07-17 07:05:46","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":2321702,"visible":true,"origin":"","legend":"","description":"","filename":"LiWangfinialmanuscript244.13.pdf","url":"https://assets-eu.researchsquare.com/files/rs-4175251/v1_covered_fb6aad56-ab53-48a1-95e1-379dbcff2ad0.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Study of fluid turbulence characteristics and structural evolution in a reciprocating mixing tank","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"reciprocating stirring, numerical simulation, turbulent energy, chaotic properties, mixing enhancement","lastPublishedDoi":"10.21203/rs.3.rs-4175251/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-4175251/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eReciprocating mixing is a novel mixing technique designed to enhance mixing efficiency. In this method, the mixing paddle moves back and forth along the axial direction periodically, unlike conventional mixing methods. The mixing efficiency of reciprocating stirring can be significantly enhanced compared to conventional stirring. In this thesis, the flow field characteristics and numerical simulation of the Rushton pulp reciprocating mixing tank are analyzed using the Computational Fluid Dynamics (CFD) method with VOF and UDF function control. It has been found that reciprocating mixing increases the overall speed of the fluid by about 8%, the turbulent kinetic energy by 35%-45%, and the turbulent kinetic energy dissipation rate by 10%-16% compared with conventional mixing. Reciprocating mixing significantly affects the tank basin, enhancing the axial flow of the fluid in the tank, disrupting the circulating structure of conventional agitation, and dynamically integrating the multiple flow regions of conventional agitation to improve mixing homogeneity. Additionally, the evolution process of vortex generation, development, and extinction by reciprocal stirring is quantitatively analyzed to determine the optimal size of paddle discs under different conditions. The maximum values of turbulent kinetic energy in the two stirring modes are FS-4/12D and RS-5/12D, respectively. The reason for the abrupt decrease of turbulent kinetic energy in RS-4/12D is explained as follows: The uncaused quadratic flow variance indicates that the reduction of the tail vortex size can effectively destroy the reflux zone, thus reducing the energy consumption at the tail vortex and allowing more energy to be used for fluid mixing. 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