{"id":{"repo_id":"uoit","oai_identifier":"oai:ontariotechu.scholaris.ca:10155/1896"},"canonical_url":"https://search.dev.ndltd.org/etd/uoit/oai:ontariotechu.scholaris.ca:10155/1896","repository":{"repo_id":"uoit","name":"Ontario Institute of Technology","base_url":"https://ontariotechu.scholaris.ca/server/oai/request"},"display":{"title":"Heat transfer to supercritical water flowing in short vertical bare tube and rod-bundle geometries","abstract":"Water-cooled nuclear reactors have lower thermal efficiencies (26–38%) compared to thermal Power Pants (PPs) (up to 62%). To improve efficiency, SuperCritical Water-cooled Reactors (SCWRs) and SuperCritical-Pressure-Small Modular Reactors (SCP-SMRs) operate at supercritical pressures, requiring detailed studies of Heat Transfer (HT). This research investigates experimental data from vertical bare tubes and rod-bundle geometries (single-rod annular channel and 3-rod bundles with helical ribs) at pressures of 22.6–27.5 MPa, mass fluxes of 248–2700 kg/m²s, and Heat Fluxes (HFs) of 103–3289 kW/m². All three heat transfer regimes (Normal, Improved and Deteriorated) were observed, with stable behavior under unchanged conditions. Helical ribs had minimal impact on Heat Transfer Coefficients (HTCs) but increased the minimum HF for Deteriorated Heat Transfer Regime (DHT) onset by 1.6–1.8 times compared to bare tubes, offering critical insights for SCWR designs.","abstract_html":"Water-cooled nuclear reactors have lower thermal efficiencies (26–38%) compared to thermal Power Pants (PPs) (up to 62%). To improve efficiency, SuperCritical Water-cooled Reactors (SCWRs) and SuperCritical-Pressure-Small Modular Reactors (SCP-SMRs) operate at supercritical pressures, requiring detailed studies of Heat Transfer (HT). This research investigates experimental data from vertical bare tubes and rod-bundle geometries (single-rod annular channel and 3-rod bundles with helical ribs) at pressures of 22.6–27.5 MPa, mass fluxes of 248–2700 kg/m²s, and Heat Fluxes (HFs) of 103–3289 kW/m². All three heat transfer regimes (Normal, Improved and Deteriorated) were observed, with stable behavior under unchanged conditions. Helical ribs had minimal impact on Heat Transfer Coefficients (HTCs) but increased the minimum HF for Deteriorated Heat Transfer Regime (DHT) onset by 1.6–1.8 times compared to bare tubes, offering critical insights for SCWR designs.","abstract_has_math":false,"creators":["Kavalci, Mehmet E."],"institution":"University of Ontario Institute of Technology","degree_name":"Master of Applied Science (MASc)","degree_level":null,"degree_discipline":"Nuclear Engineering","degree_department":null,"school":null,"contributors":[],"advisors":["Pioro, Igor"],"committee_chairs":[],"committee_members":[],"year":2024,"date_issued":"2024-12-01","date_published":"2024-12-01","updated_at":"2026-07-24T05:35:22Z","subjects":[],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/10155/1896","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Pioro, Igor"]},{"key":"dc:creator","label":"Author","values":["Kavalci, Mehmet E."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-03-18T17:38:37Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-03-18T17:38:37Z"]},{"key":"dc:date.issued","label":"Date","values":["2024-12-01"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Nuclear Engineering"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Applied Science (MASc)"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Ontario Institute of Technology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/10155/1896"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Water-cooled nuclear reactors have lower thermal efficiencies (26–38%) compared to thermal Power Pants (PPs) (up to 62%). To improve efficiency, SuperCritical Water-cooled Reactors (SCWRs) and SuperCritical-Pressure-Small Modular Reactors (SCP-SMRs) operate at supercritical pressures, requiring detailed studies of Heat Transfer (HT). This research investigates experimental data from vertical bare tubes and rod-bundle geometries (single-rod annular channel and 3-rod bundles with helical ribs) at pressures of 22.6–27.5 MPa, mass fluxes of 248–2700 kg/m²s, and Heat Fluxes (HFs) of 103–3289 kW/m². All three heat transfer regimes (Normal, Improved and Deteriorated) were observed, with stable behavior under unchanged conditions. Helical ribs had minimal impact on Heat Transfer Coefficients (HTCs) but increased the minimum HF for Deteriorated Heat Transfer Regime (DHT) onset by 1.6–1.8 times compared to bare tubes, offering critical insights for SCWR designs."]},{"key":"dc:title","label":"Title","values":["Heat transfer to supercritical water flowing in short vertical bare tube and rod-bundle geometries"]}]}],"canonical_facts":{"dc:contributor.advisor":["Pioro, Igor"],"dc:creator":["Kavalci, Mehmet E."],"dc:date.accessioned":["2025-03-18T17:38:37Z"],"dc:date.available":["2025-03-18T17:38:37Z"],"dc:date.issued":["2024-12-01"],"dc:description.abstract":["Water-cooled nuclear reactors have lower thermal efficiencies (26–38%) compared to thermal Power Pants (PPs) (up to 62%). To improve efficiency, SuperCritical Water-cooled Reactors (SCWRs) and SuperCritical-Pressure-Small Modular Reactors (SCP-SMRs) operate at supercritical pressures, requiring detailed studies of Heat Transfer (HT). This research investigates experimental data from vertical bare tubes and rod-bundle geometries (single-rod annular channel and 3-rod bundles with helical ribs) at pressures of 22.6–27.5 MPa, mass fluxes of 248–2700 kg/m²s, and Heat Fluxes (HFs) of 103–3289 kW/m². All three heat transfer regimes (Normal, Improved and Deteriorated) were observed, with stable behavior under unchanged conditions. Helical ribs had minimal impact on Heat Transfer Coefficients (HTCs) but increased the minimum HF for Deteriorated Heat Transfer Regime (DHT) onset by 1.6–1.8 times compared to bare tubes, offering critical insights for SCWR designs."],"dc:identifier.uri":["https://hdl.handle.net/10155/1896"],"dc:language.iso":["en"],"dc:title":["Heat transfer to supercritical water flowing in short vertical bare tube and rod-bundle geometries"],"dc:type":["Thesis"],"thesis:degree_discipline":["Nuclear Engineering"],"thesis:degree_name":["Master of Applied Science (MASc)"],"thesis:institution_name":["University of Ontario Institute of Technology"]},"updated_at":"2026-07-24T05:35:22Z"}