Numerical simulation of flow field in single-head broken-tooth spiral extrusion dewatering channel

Numerical simulation of flow field in single-head broken-tooth spiral extrusion dewatering channel | 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 Research Article Numerical simulation of flow field in single-head broken-tooth spiral extrusion dewatering channel Risu NA, Nan WANG, Silu MA, Haoran SUN This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7873162/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 To investigate the influence of single-head interrupted-tooth spiral blades on the dewatering performance of screw-type solid-liquid separation equipment, this study employs the Eulerian multiphase flow model to numerically simulate the internal flow field during dewatering. Simulations are conducted for cylindrical shaft structures with single-head interrupted-tooth blades at three intermittent distance parameters (30, 40, 50 mm) and conical shaft structures with intermittent distances of 20, 30, and 40 mm. A comparative analysis was conducted on the operational performance of the single-head interrupted-tooth spiral under both shaft types, examining the internal flow field's particle volume fraction, solid phase velocity distribution, and pressure distribution within the dewatering compression zone. The study revealed that changes in particle volume fraction within the flow channel occurred in three distinct phases: the cylindrical shaft exhibited an overall large-wave oscillatory increasing trend, while the conical shaft showed a small-wave steady increasing trend. The dewatering performance of single-head interrupted-tooth spiral blades in the conical shaft structure significantly outperformed that in the cylindrical shaft. The cylindrical shaft structure with an 40 mm intermittent distance and the conical shaft structure yielded the optimal results in this numerical simulation, achieving solid phase volume fractions at the outlet of 48% and 55%, respectively. The intermittent distance significantly influences screw squeezing dewatering performance, as its length controls material residence time within the chamber. Pressure in the squeezing zone decreases with increasing intermittent distance in the cylindrical shaft. In the conical shaft, both the small-pitch and large-pitch models exhibit high pressure in the squeezing zone. This numerical simulation provides a basis for designing single-head interrupted-tooth spiral squeezing devices. single-head interrupted-tooth spiral intermittent distance༛spiral shaft༛particle volume fraction༛numerical simulation Full Text Additional Declarations No competing interests reported. Supplementary Files Data.rar 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-7873162","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":533040532,"identity":"925e5e01-a97b-4491-9c47-9bbca4ea6024","order_by":0,"name":"Risu NA","email":"","orcid":"","institution":"Inner Mongolia University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Risu","middleName":"","lastName":"NA","suffix":""},{"id":533040534,"identity":"dd967205-f34f-44a3-9b92-cc11b51f319c","order_by":1,"name":"Nan 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channel","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"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":"single-head interrupted-tooth spiral, intermittent distance༛spiral shaft༛particle volume fraction༛numerical simulation","lastPublishedDoi":"10.21203/rs.3.rs-7873162/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-7873162/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eTo investigate the influence of single-head interrupted-tooth spiral blades on the dewatering performance of screw-type solid-liquid separation equipment, this study employs the Eulerian multiphase flow model to numerically simulate the internal flow field during dewatering. Simulations are conducted for cylindrical shaft structures with single-head interrupted-tooth blades at three intermittent distance parameters (30, 40, 50 mm) and conical shaft structures with intermittent distances of 20, 30, and 40 mm. A comparative analysis was conducted on the operational performance of the single-head interrupted-tooth spiral under both shaft types, examining the internal flow field's particle volume fraction, solid phase velocity distribution, and pressure distribution within the dewatering compression zone. The study revealed that changes in particle volume fraction within the flow channel occurred in three distinct phases: the cylindrical shaft exhibited an overall large-wave oscillatory increasing trend, while the conical shaft showed a small-wave steady increasing trend. The dewatering performance of single-head interrupted-tooth spiral blades in the conical shaft structure significantly outperformed that in the cylindrical shaft. The cylindrical shaft structure with an 40 mm intermittent distance and the conical shaft structure yielded the optimal results in this numerical simulation, achieving solid phase volume fractions at the outlet of 48% and 55%, respectively. The intermittent distance significantly influences screw squeezing dewatering performance, as its length controls material residence time within the chamber. Pressure in the squeezing zone decreases with increasing intermittent distance in the cylindrical shaft. In the conical shaft, both the small-pitch and large-pitch models exhibit high pressure in the squeezing zone. This numerical simulation provides a basis for designing single-head interrupted-tooth spiral squeezing devices.\u003c/p\u003e","manuscriptTitle":"Numerical simulation of flow field in single-head broken-tooth spiral extrusion dewatering channel","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-10-22 02:50:23","doi":"10.21203/rs.3.rs-7873162/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","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}}],"origin":"","ownerIdentity":"2647e0dc-5372-407a-9658-f2ea5ac05652","owner":[],"postedDate":"October 22nd, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2025-10-22T02:50:25+00:00","versionOfRecord":[],"versionCreatedAt":"2025-10-22 02:50:23","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-7873162","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-7873162","identity":"rs-7873162","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}