Search citation statements
Paper Sections
Citation Types
Year Published
Publication Types
Relationship
Authors
Journals
Fluid mixing induced by changes in tube direction is an effective method to enhance the heat transfer performance of heat transfer tubes. This study proposes three types of configuration forms for heat transfer tubes that improve their thermo-hydraulic performance, named cases 1, 2, and 3. Case 1 is distributed on the same plane and has the following configuration form: horizontal to vertical upward to horizontal to vertical downward to horizontal. Cases 2 and 3 transform the front and rear tubes into two parallel planes through the middle horizontal tube, with a 180° difference at the outlet direction. The thermo-hydraulic performance of heat transfer tubes with different configuration forms is evaluated by quantitative comparison of the Nusselt number (Nu), friction coefficient (f), and performance evaluation criterion (PEC), within a Reynolds number range of 5000–40 000. The distribution results of velocity, streamline, turbulent kinetic energy, skin friction coefficient, and so on are analyzed to reveal the underlying mechanisms of difference in the thermo-hydraulic performance of heat transfer tubes with different configurations. The results show that the thermo-hydraulic performance of heat transfer tubes with different configurations is better than that of a straight tube due to induced fluid mixing within the tube. In addition, case 1 rather than cases 2 and 3 has a more significant influence on the thermo-hydraulic performance of heat transfer tubes, especially at high Reynolds numbers, and the maximum PEC of case 1 exceeds cases 2 and 3 by 6% and 8.5%, respectively. Furthermore, the decrease in connection length of case 1 improves the heat transfer performance, which is more pronounced at high Reynolds numbers. These research findings serve as a valuable reference for designing heat transfer tube configurations to enhance heat transfer efficiency.
Fluid mixing induced by changes in tube direction is an effective method to enhance the heat transfer performance of heat transfer tubes. This study proposes three types of configuration forms for heat transfer tubes that improve their thermo-hydraulic performance, named cases 1, 2, and 3. Case 1 is distributed on the same plane and has the following configuration form: horizontal to vertical upward to horizontal to vertical downward to horizontal. Cases 2 and 3 transform the front and rear tubes into two parallel planes through the middle horizontal tube, with a 180° difference at the outlet direction. The thermo-hydraulic performance of heat transfer tubes with different configuration forms is evaluated by quantitative comparison of the Nusselt number (Nu), friction coefficient (f), and performance evaluation criterion (PEC), within a Reynolds number range of 5000–40 000. The distribution results of velocity, streamline, turbulent kinetic energy, skin friction coefficient, and so on are analyzed to reveal the underlying mechanisms of difference in the thermo-hydraulic performance of heat transfer tubes with different configurations. The results show that the thermo-hydraulic performance of heat transfer tubes with different configurations is better than that of a straight tube due to induced fluid mixing within the tube. In addition, case 1 rather than cases 2 and 3 has a more significant influence on the thermo-hydraulic performance of heat transfer tubes, especially at high Reynolds numbers, and the maximum PEC of case 1 exceeds cases 2 and 3 by 6% and 8.5%, respectively. Furthermore, the decrease in connection length of case 1 improves the heat transfer performance, which is more pronounced at high Reynolds numbers. These research findings serve as a valuable reference for designing heat transfer tube configurations to enhance heat transfer efficiency.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.