Supercritical carbon dioxide (sCO2) is a promising heat transfer fluid for the refrigeration and power generation industries due to its unique thermal properties and low environmental impact. To understand it as an alternative to traditional working fluids, the thermophysical and heat transfer phenomena of sCO2 are often studied using simplified geometries (tubes). Focus has been placed on investigating averaged heat transfer trends under an array of flow conditions with either a constant wall heat flux, constant wall temperature, or conjugate thermal boundary condition. Less emphasis has been placed on studying local sCO2 heat transfer developments. Tubular sCO2 numerical models that implement either a constant wall heat flux or constant wall temperature boundary condition are often validated against tube-in-tube heat exchanger experiments involving a conjugate boundary conditions, despite the intrinsic differences between the thermal boundary conditions. The heat transfer coefficient is the primary metric used to compare model results to experiments, but detailed information regarding how comparisons are made is often omitted. In this work, the differences in local heat transfer trends of sCO2 in horizontally-oriented tubular geometries, under different thermal boundary conditions, were investigated numerically
","abstract_html":"<p>Supercritical carbon dioxide (sCO2) is a promising heat transfer fluid for the refrigeration and power generation industries due to its unique thermal properties and low environmental impact. To understand it as an alternative to traditional working fluids, the thermophysical and heat transfer phenomena of sCO2 are often studied using simplified geometries (tubes). Focus has been placed on investigating averaged heat transfer trends under an array of flow conditions with either a constant wall heat flux, constant wall temperature, or conjugate thermal boundary condition. Less emphasis has been placed on studying local sCO2 heat transfer developments. Tubular sCO2 numerical models that implement either a constant wall heat flux or constant wall temperature boundary condition are often validated against tube-in-tube heat exchanger experiments involving a conjugate boundary conditions, despite the intrinsic differences between the thermal boundary conditions. The heat transfer coefficient is the primary metric used to compare model results to experiments, but detailed information regarding how comparisons are made is often omitted. In this work, the differences in local heat transfer trends of sCO2 in horizontally-oriented tubular geometries, under different thermal boundary conditions, were investigated numerically</p>","abstract_has_math":false,"creators":["Lopes, Nicholas C."],"institution":null,"degree_name":"Master of Science in Mechanical Engineering","degree_level":"Thesis - Open Access","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-04-01T07:00:00Z","date_published":"2023-04-01T07:00:00Z","updated_at":"2026-07-27T19:25:52Z","subjects":["Supercritical carbon dioxide (sCO2)","heat transfer","environmental impact","fluids","tubes","Heat Transfer, Combustion","Mechanical Engineering"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://commons.erau.edu/edt/727","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Lopes, Nicholas C."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis - Open Access"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science in Mechanical Engineering"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Supercritical carbon dioxide (sCO2)","heat transfer","environmental impact","fluids","tubes","Heat Transfer, Combustion","Mechanical Engineering"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://commons.erau.edu/edt/727"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Supercritical carbon dioxide (sCO2) is a promising heat transfer fluid for the refrigeration and power generation industries due to its unique thermal properties and low environmental impact. To understand it as an alternative to traditional working fluids, the thermophysical and heat transfer phenomena of sCO2 are often studied using simplified geometries (tubes). Focus has been placed on investigating averaged heat transfer trends under an array of flow conditions with either a constant wall heat flux, constant wall temperature, or conjugate thermal boundary condition. Less emphasis has been placed on studying local sCO2 heat transfer developments. Tubular sCO2 numerical models that implement either a constant wall heat flux or constant wall temperature boundary condition are often validated against tube-in-tube heat exchanger experiments involving a conjugate boundary conditions, despite the intrinsic differences between the thermal boundary conditions. The heat transfer coefficient is the primary metric used to compare model results to experiments, but detailed information regarding how comparisons are made is often omitted. In this work, the differences in local heat transfer trends of sCO2 in horizontally-oriented tubular geometries, under different thermal boundary conditions, were investigated numerically
"]},{"key":"dc:title","label":"Title","values":["Thermal Boundary Condition Effects On Local Supercritical CO2 Heat Transfer Trends In Tubes"]}]}],"canonical_facts":{"dc:creator":["Lopes, Nicholas C."],"dc:description.abstract":["Supercritical carbon dioxide (sCO2) is a promising heat transfer fluid for the refrigeration and power generation industries due to its unique thermal properties and low environmental impact. To understand it as an alternative to traditional working fluids, the thermophysical and heat transfer phenomena of sCO2 are often studied using simplified geometries (tubes). Focus has been placed on investigating averaged heat transfer trends under an array of flow conditions with either a constant wall heat flux, constant wall temperature, or conjugate thermal boundary condition. Less emphasis has been placed on studying local sCO2 heat transfer developments. Tubular sCO2 numerical models that implement either a constant wall heat flux or constant wall temperature boundary condition are often validated against tube-in-tube heat exchanger experiments involving a conjugate boundary conditions, despite the intrinsic differences between the thermal boundary conditions. The heat transfer coefficient is the primary metric used to compare model results to experiments, but detailed information regarding how comparisons are made is often omitted. In this work, the differences in local heat transfer trends of sCO2 in horizontally-oriented tubular geometries, under different thermal boundary conditions, were investigated numerically
"],"dc:identifier":["https://commons.erau.edu/edt/727"],"dc:subject":["Supercritical carbon dioxide (sCO2)","heat transfer","environmental impact","fluids","tubes","Heat Transfer, Combustion","Mechanical Engineering"],"dc:title":["Thermal Boundary Condition Effects On Local Supercritical CO2 Heat Transfer Trends In Tubes"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis - Open Access"],"thesis:degree_name":["Master of Science in Mechanical Engineering"]},"updated_at":"2026-07-27T19:25:52Z"}