Experimental Study of Two-phase Pressure Drop in Adiabatic Tubes at Subatmospheric System Pressures

Experimental Study of Two-phase Pressure Drop in Adiabatic Tubes at Subatmospheric System Pressures | 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 Experimental Study of Two-phase Pressure Drop in Adiabatic Tubes at Subatmospheric System Pressures Arvind Kumar, Hardik B. Kothadia This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-3495802/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 01 May, 2025 Read the published version in Heat and Mass Transfer → Version 1 posted 8 You are reading this latest preprint version Abstract The prediction of the frictional pressure drop in the two-phase flow has become highly crucial for the enhancement of heat transfer methodologies for various industrial applications in order to design thermal equipment efficiently. The pressure drop in the heat transfer equipment is affected by the system pressure, system geometry and working fluid. There is a dearth of literature on two-phase pressure drop in the conventional adiabatic tubes at subatmospheric system pressures. Experimental investigations on the pressure drop have been conducted at 0.25, 0.5, 0.75, and 1 bar system pressures in 1500 mm long, 8, 13.7, and 18 mm diameter adiabatic tubes. The steam at 0 – 1 vapor quality is used at 32 – 660 kg/m 2 s mass flux in the adiabatic tubes. The effects of tube diameter, vapor quality, mass flux and system pressure on two-phase frictional pressure drop are investigated. In the liquid-vapor flow, the pressure drop experiences a non-linear increase with changes in vapor quality. The frictional pressure drop in two-phase flow is elevated with higher vapor quality, reduced subatmospheric system pressure, increased mass flux, and a smaller tube diameter. The correlations suggested for two-phase frictional pressure drop at higher system pressure predict the pressure drop reasonably in the adiabatic tubes at subatmospheric system pressure. Pressure drop Two-phase flow Subatmospheric pressure Steam Adiabatic tube Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 01 May, 2025 Read the published version in Heat and Mass Transfer → Version 1 posted Editorial decision: Revision requested 19 Dec, 2023 Reviews received at journal 03 Dec, 2023 Reviewers agreed at journal 27 Nov, 2023 Reviewers agreed at journal 27 Nov, 2023 Reviewers invited by journal 27 Nov, 2023 Editor assigned by journal 27 Nov, 2023 Submission checks completed at journal 31 Oct, 2023 First submitted to journal 26 Oct, 2023 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. 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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-3495802","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":244401720,"identity":"e68e4180-811a-4116-a4d5-d8027d217a96","order_by":0,"name":"Arvind Kumar","email":"","orcid":"","institution":"Indian Institute of Technology Jodhpur","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Arvind","middleName":"","lastName":"Kumar","suffix":""},{"id":244401721,"identity":"cba8f317-b905-449f-ad4d-f7a2d2dc3ae8","order_by":1,"name":"Hardik B. 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