The Effect of Liquid Hydrocarbon Stream Recirculation on the Efficiency of Heat Exchange in a Shell-and-tube Unit

The Effect of Liquid Hydrocarbon Stream Recirculation on the Efficiency of Heat Exchange in a Shell-and-tube Unit | 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 The Effect of Liquid Hydrocarbon Stream Recirculation on the Efficiency of Heat Exchange in a Shell-and-tube Unit Oybek Yuliboyevich Ismoilov, Rustam Yusupov, Kumush Axmedova, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6643271/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 22 Sep, 2025 Read the published version in Chemical Papers → Version 1 posted 5 You are reading this latest preprint version Abstract Studying the efficiency of heat exchange in shell-and-tube units is among the key objectives in process engineering. An experimental setup was developed to investigate the effect of raw material stream recirculation on the heat exchange process in tubular heat exchangers. The setup consists of a shell with a length of L = 1 m and a shell diameter of D = 76 mm, containing n = 7 tubes, each with an inner diameter of d = 15 mm. The diameter of the main stream pipe is dₐ = 20 mm, and the diameter of the recirculation stream pipe is d r = 10 mm. The raw material feed rate is 10 L/min, with an initial temperature of t₀ = 20°C. The influence of recirculation ratios ranging from 5–30% on the hydrodynamic regimes of the flow and the effect of changes in the thermal-physical properties of heat carriers on the heat exchange process was studied. It was found that increasing the oil recirculation ratio up to 30% leads to a temperature increase at the outlet of the oil stream by up to 16°C, and for the gas condensate stream by up to 18°C. Recirculating up to 30% of the hot stream back into the initial stream improved the hydrodynamic regime due to a 1.36% increase in density and a 25.4% decrease in kinematic viscosity of the primary gas condensate stream, and a 1.06% increase in density and 28.1% decrease in viscosity for the oil stream. As a result, the heat transfer coefficient α₂ increased by 5.49% during oil heating and by 6.38% for gas condensate, while the overall heat transfer coefficient K of the process rose by 14%. Oil gas condensate recirculation ratio viscosity density heat transfer coefficient heat exchange efficiency overall heat transfer coefficient Full Text Cite Share Download PDF Status: Published Journal Publication published 22 Sep, 2025 Read the published version in Chemical Papers → Version 1 posted Editorial decision: Minor revisions 02 Jul, 2025 Reviewers agreed at journal 21 May, 2025 Reviewers invited by journal 20 May, 2025 Editor assigned by journal 16 May, 2025 First submitted to journal 13 May, 2025 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. 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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-6643271","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":459249569,"identity":"36fec3a2-6be6-46e5-a042-b4bafc9be3d2","order_by":0,"name":"Oybek Yuliboyevich Ismoilov","email":"","orcid":"","institution":"Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan","correspondingAuthor":false,"prefix":"","firstName":"Oybek","middleName":"Yuliboyevich","lastName":"Ismoilov","suffix":""},{"id":459249570,"identity":"058d4482-4100-4bb3-b1d7-36fc8b8ed527","order_by":1,"name":"Rustam 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Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"Oil, gas condensate, recirculation ratio, viscosity, density, heat transfer coefficient, heat exchange efficiency, overall heat transfer coefficient","lastPublishedDoi":"10.21203/rs.3.rs-6643271/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6643271/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eStudying the efficiency of heat exchange in shell-and-tube units is among the key objectives in process engineering. An experimental setup was developed to investigate the effect of raw material stream recirculation on the heat exchange process in tubular heat exchangers. The setup consists of a shell with a length of L\u0026thinsp;=\u0026thinsp;1 m and a shell diameter of D\u0026thinsp;=\u0026thinsp;76 mm, containing n\u0026thinsp;=\u0026thinsp;7 tubes, each with an inner diameter of d\u0026thinsp;=\u0026thinsp;15 mm. The diameter of the main stream pipe is dₐ = 20 mm, and the diameter of the recirculation stream pipe is d\u003csub\u003er\u003c/sub\u003e = 10 mm. The raw material feed rate is 10 L/min, with an initial temperature of t₀ = 20\u0026deg;C. The influence of recirculation ratios ranging from 5\u0026ndash;30% on the hydrodynamic regimes of the flow and the effect of changes in the thermal-physical properties of heat carriers on the heat exchange process was studied. It was found that increasing the oil recirculation ratio up to 30% leads to a temperature increase at the outlet of the oil stream by up to 16\u0026deg;C, and for the gas condensate stream by up to 18\u0026deg;C. Recirculating up to 30% of the hot stream back into the initial stream improved the hydrodynamic regime due to a 1.36% increase in density and a 25.4% decrease in kinematic viscosity of the primary gas condensate stream, and a 1.06% increase in density and 28.1% decrease in viscosity for the oil stream. As a result, the heat transfer coefficient α₂ increased by 5.49% during oil heating and by 6.38% for gas condensate, while the overall heat transfer coefficient K of the process rose by 14%.\u003c/p\u003e","manuscriptTitle":"The Effect of Liquid Hydrocarbon Stream Recirculation on the Efficiency of Heat Exchange in a Shell-and-tube Unit","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-05-24 03:41:31","doi":"10.21203/rs.3.rs-6643271/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Minor revisions","date":"2025-07-02T13:56:06+00:00","index":"","fulltext":""},{"type":"reviewerAgreed","content":"","date":"2025-05-21T05:21:29+00:00","index":0,"fulltext":""},{"type":"reviewersInvited","content":"","date":"2025-05-20T10:20:59+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2025-05-16T04:34:58+00:00","index":"","fulltext":""},{"type":"submitted","content":"Chemical Papers","date":"2025-05-14T01:53:22+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"chemical-papers","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"chpa","sideBox":"Learn more about [Chemical Papers](http://link.springer.com/journal/11696)","snPcode":"11696","submissionUrl":"https://www.editorialmanager.com/CHPA/default.aspx","title":"Chemical Papers","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false}}],"origin":"","ownerIdentity":"4fc41da1-50ea-410e-9e61-6a56429af9d7","owner":[],"postedDate":"May 24th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"published-in-journal","subjectAreas":[],"tags":[],"updatedAt":"2025-09-29T16:03:32+00:00","versionOfRecord":{"articleIdentity":"rs-6643271","link":"https://doi.org/10.1007/s11696-025-04374-0","journal":{"identity":"chemical-papers","isVorOnly":false,"title":"Chemical Papers"},"publishedOn":"2025-09-22 15:57:49","publishedOnDateReadable":"September 22nd, 2025"},"versionCreatedAt":"2025-05-24 03:41:31","video":"","vorDoi":"10.1007/s11696-025-04374-0","vorDoiUrl":"https://doi.org/10.1007/s11696-025-04374-0","workflowStages":[]},"version":"v1","identity":"rs-6643271","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-6643271","identity":"rs-6643271","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}