\"Heat transfer enhancement by means of internally modified geometries in tubes and channels is an important mechanism to improve the survivability of components in extreme high-heat flux environments. Various features such as ribs and fins are studied using computational fluid dynamics in both uniform and one-sided heating in tubes and rectangular channels respectively to determine the most effective geometries across a variety of different flow and heating conditions. This work examines heat transfer enhancement and rib geometry optimization to support experimental research for nuclear fusion applications. The project begins by designing and analyzing test sections supporting a helium flow loop assembled at Oak Ridge National Laboratory to analyze heat transfer enhancement for systems such as blanket and divertor components. This initial phase uses STAR-CCM+ to study a base set of literature-supported helium-cooled ribbed and fin geometries in tubes to examine their thermal and pressure drop performance relative to one another. The scope then broadens to using the STAR-CCM+ Design Manager tool to build a Pareto frontier of competing surface average Nusselt number and Fanning friction factor objectives. This study explores a variety of rib shapes and orientations in a rectangular air-cooled channel for optimal heat transfer performance and friction to determine the relationships between the different shapes, orientations, flow phenomena, and thermal performance due to the enhancements. Finally, this project concludes by using optimization techniques to perform single objective optimization of overall heat transfer enhancement on ribs in helium-cooled tubes for the helium flow loop conditions to improve knowledge surrounding geometry enhancement for fusion blanket research\"--Abstract, p. iv
","abstract_html":"<p>"Heat transfer enhancement by means of internally modified geometries in tubes and channels is an important mechanism to improve the survivability of components in extreme high-heat flux environments. Various features such as ribs and fins are studied using computational fluid dynamics in both uniform and one-sided heating in tubes and rectangular channels respectively to determine the most effective geometries across a variety of different flow and heating conditions. This work examines heat transfer enhancement and rib geometry optimization to support experimental research for nuclear fusion applications. The project begins by designing and analyzing test sections supporting a helium flow loop assembled at Oak Ridge National Laboratory to analyze heat transfer enhancement for systems such as blanket and divertor components. This initial phase uses STAR-CCM+ to study a base set of literature-supported helium-cooled ribbed and fin geometries in tubes to examine their thermal and pressure drop performance relative to one another. The scope then broadens to using the STAR-CCM+ Design Manager tool to build a Pareto frontier of competing surface average Nusselt number and Fanning friction factor objectives. This study explores a variety of rib shapes and orientations in a rectangular air-cooled channel for optimal heat transfer performance and friction to determine the relationships between the different shapes, orientations, flow phenomena, and thermal performance due to the enhancements. Finally, this project concludes by using optimization techniques to perform single objective optimization of overall heat transfer enhancement on ribs in helium-cooled tubes for the helium flow loop conditions to improve knowledge surrounding geometry enhancement for fusion blanket research"--Abstract, p. iv</p>","abstract_has_math":false,"creators":["Gehrig, Monica"],"institution":"Missouri University of Science and Technology","degree_name":"Ph. D. in Nuclear Engineering","degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T03:18:18Z","subjects":["Heat Transfer Enhancement","Helium Cooling","Nuclear Fusion","Optimization","Engineering","Nuclear Engineering"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarsmine.mst.edu/doctoral_dissertations/3237","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Gehrig, Monica"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:type","label":"Dc Type","values":["Dissertation - Open Access"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph. D. in Nuclear Engineering"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Missouri University of Science and Technology"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Heat Transfer Enhancement","Helium Cooling","Nuclear Fusion","Optimization","Engineering","Nuclear Engineering"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarsmine.mst.edu/doctoral_dissertations/3237"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["\"Heat transfer enhancement by means of internally modified geometries in tubes and channels is an important mechanism to improve the survivability of components in extreme high-heat flux environments. Various features such as ribs and fins are studied using computational fluid dynamics in both uniform and one-sided heating in tubes and rectangular channels respectively to determine the most effective geometries across a variety of different flow and heating conditions. This work examines heat transfer enhancement and rib geometry optimization to support experimental research for nuclear fusion applications. The project begins by designing and analyzing test sections supporting a helium flow loop assembled at Oak Ridge National Laboratory to analyze heat transfer enhancement for systems such as blanket and divertor components. This initial phase uses STAR-CCM+ to study a base set of literature-supported helium-cooled ribbed and fin geometries in tubes to examine their thermal and pressure drop performance relative to one another. The scope then broadens to using the STAR-CCM+ Design Manager tool to build a Pareto frontier of competing surface average Nusselt number and Fanning friction factor objectives. This study explores a variety of rib shapes and orientations in a rectangular air-cooled channel for optimal heat transfer performance and friction to determine the relationships between the different shapes, orientations, flow phenomena, and thermal performance due to the enhancements. Finally, this project concludes by using optimization techniques to perform single objective optimization of overall heat transfer enhancement on ribs in helium-cooled tubes for the helium flow loop conditions to improve knowledge surrounding geometry enhancement for fusion blanket research\"--Abstract, p. iv
"]},{"key":"dc:title","label":"Title","values":["USING COMPUTATIONAL METHODS TO OPTIMIZE HIGH HEAT FLUX COMPONENT THERMAL PERFORMANCE IN MAGNETIC CONFINEMENT FUSION REACTOR RESEARCH"]}]}],"canonical_facts":{"dc:creator":["Gehrig, Monica"],"dc:description.abstract":["\"Heat transfer enhancement by means of internally modified geometries in tubes and channels is an important mechanism to improve the survivability of components in extreme high-heat flux environments. Various features such as ribs and fins are studied using computational fluid dynamics in both uniform and one-sided heating in tubes and rectangular channels respectively to determine the most effective geometries across a variety of different flow and heating conditions. This work examines heat transfer enhancement and rib geometry optimization to support experimental research for nuclear fusion applications. The project begins by designing and analyzing test sections supporting a helium flow loop assembled at Oak Ridge National Laboratory to analyze heat transfer enhancement for systems such as blanket and divertor components. This initial phase uses STAR-CCM+ to study a base set of literature-supported helium-cooled ribbed and fin geometries in tubes to examine their thermal and pressure drop performance relative to one another. The scope then broadens to using the STAR-CCM+ Design Manager tool to build a Pareto frontier of competing surface average Nusselt number and Fanning friction factor objectives. This study explores a variety of rib shapes and orientations in a rectangular air-cooled channel for optimal heat transfer performance and friction to determine the relationships between the different shapes, orientations, flow phenomena, and thermal performance due to the enhancements. Finally, this project concludes by using optimization techniques to perform single objective optimization of overall heat transfer enhancement on ribs in helium-cooled tubes for the helium flow loop conditions to improve knowledge surrounding geometry enhancement for fusion blanket research\"--Abstract, p. iv
"],"dc:identifier":["https://scholarsmine.mst.edu/doctoral_dissertations/3237"],"dc:subject":["Heat Transfer Enhancement","Helium Cooling","Nuclear Fusion","Optimization","Engineering","Nuclear Engineering"],"dc:title":["USING COMPUTATIONAL METHODS TO OPTIMIZE HIGH HEAT FLUX COMPONENT THERMAL PERFORMANCE IN MAGNETIC CONFINEMENT FUSION REACTOR RESEARCH"],"dc:type":["Dissertation - Open Access"],"thesis:degree_name":["Ph. D. in Nuclear Engineering"],"thesis:institution_name":["Missouri University of Science and Technology"]},"updated_at":"2026-07-24T03:18:18Z"}