Experimental Heat Transfer Analysis of Helical Coiled Tubes on the Basis of Variation in Curvature Ratio and Geometry
The influence of curvature ratio (CR) within helical tubes on secondary flows and subsequent enhancement of heat transfer is well-established. Furthermore, the interaction between the shell fluid and the helical tube is recognized as pivotal in this regard. In this paper, the impact of varying CR an...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Semnan University
2024-06-01
|
| Series: | Journal of Heat and Mass Transfer Research |
| Subjects: | |
| Online Access: | https://jhmtr.semnan.ac.ir/article_8625_3935e16110db3d9820e1103e425df982.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850115631790161920 |
|---|---|
| author | Susheel Madhavrao Magar Gaurav Kumar Gugliani Ravindra Rambhau Navthar |
| author_facet | Susheel Madhavrao Magar Gaurav Kumar Gugliani Ravindra Rambhau Navthar |
| author_sort | Susheel Madhavrao Magar |
| collection | DOAJ |
| description | The influence of curvature ratio (CR) within helical tubes on secondary flows and subsequent enhancement of heat transfer is well-established. Furthermore, the interaction between the shell fluid and the helical tube is recognized as pivotal in this regard. In this paper, the impact of varying CR and coil geometry on the performance of heat exchangers (HEs) through experimental heat transfer analysis conducted on five distinct coils viz., straight helical (ϴ= 90°), conical (ϴ= 70°,50°,30°), and spiral (ϴ= 0°) configurations have been studied. Moreover, correlations for modified effectiveness are proposed for all HEs. The Reynolds number range chosen for the analysis spans from 3700 to 20000, encompassing laminar and turbulent flow regimes of the coil hot water. The optimal HE is identified based on thermal and hydrodynamic parameters, including hot water temperature difference, effectiveness, modified effectiveness, rate of heat transfer, pressure drops of the coil, shell fluids, and pumping power. Observations reveal that helical cone coil heat exchangers (HCCHEs) demonstrate superior thermal and hydrodynamic characteristics when the fluid flow aligns with increasing CR. Notably, for both laminar and turbulent flows, the highest hot water temperature difference, effectiveness, and rate of heat transfer are observed for ϴ= 30° HCCHE, while the lowest values are attributed to ϴ= 90° HE. Tube side Nusselt numbers, pressure drops, and friction factors show agreement with the predictions of researchers. The analysis reveals that the coil fluid pressure drop is maximal for ϴ =0° HE, whereas the maximum shell fluid pressure drop is encountered for ϴ =90° HE. Furthermore, the highest pumping power per unit heat transfer area for coil and shell fluids are noted for ϴ= 0° HE and ϴ= 90°HE, respectively, while ϴ= 30° HCCHE exhibits comparable performance to the remaining HEs within the specified parameter range, establishing its optimality. |
| format | Article |
| id | doaj-art-033752c4cc024ce2a0a8d32f1429aeeb |
| institution | OA Journals |
| issn | 2345-508X 2383-3068 |
| language | English |
| publishDate | 2024-06-01 |
| publisher | Semnan University |
| record_format | Article |
| series | Journal of Heat and Mass Transfer Research |
| spelling | doaj-art-033752c4cc024ce2a0a8d32f1429aeeb2025-08-20T02:36:31ZengSemnan UniversityJournal of Heat and Mass Transfer Research2345-508X2383-30682024-06-011118910810.22075/jhmtr.2024.32179.14918625Experimental Heat Transfer Analysis of Helical Coiled Tubes on the Basis of Variation in Curvature Ratio and GeometrySusheel Madhavrao Magar0Gaurav Kumar Gugliani1Ravindra Rambhau Navthar2Department of Mechanical Engineering, Mandsaur University, Rewas Dewda Road, SH - 31, Mandsaur, Madhya Pradesh, 458001, IndiaDepartment of Mechanical Engineering, Mandsaur University, Rewas Dewda Road, SH - 31, Mandsaur, Madhya Pradesh, 458001, IndiaDepartment of Mechanical Engineering, Dr. Vithalrao Vikhe Patil College of Engineering, Vadgaon Gupta, Ahmednaghar, Maharashtra, 414111, IndiaThe influence of curvature ratio (CR) within helical tubes on secondary flows and subsequent enhancement of heat transfer is well-established. Furthermore, the interaction between the shell fluid and the helical tube is recognized as pivotal in this regard. In this paper, the impact of varying CR and coil geometry on the performance of heat exchangers (HEs) through experimental heat transfer analysis conducted on five distinct coils viz., straight helical (ϴ= 90°), conical (ϴ= 70°,50°,30°), and spiral (ϴ= 0°) configurations have been studied. Moreover, correlations for modified effectiveness are proposed for all HEs. The Reynolds number range chosen for the analysis spans from 3700 to 20000, encompassing laminar and turbulent flow regimes of the coil hot water. The optimal HE is identified based on thermal and hydrodynamic parameters, including hot water temperature difference, effectiveness, modified effectiveness, rate of heat transfer, pressure drops of the coil, shell fluids, and pumping power. Observations reveal that helical cone coil heat exchangers (HCCHEs) demonstrate superior thermal and hydrodynamic characteristics when the fluid flow aligns with increasing CR. Notably, for both laminar and turbulent flows, the highest hot water temperature difference, effectiveness, and rate of heat transfer are observed for ϴ= 30° HCCHE, while the lowest values are attributed to ϴ= 90° HE. Tube side Nusselt numbers, pressure drops, and friction factors show agreement with the predictions of researchers. The analysis reveals that the coil fluid pressure drop is maximal for ϴ =0° HE, whereas the maximum shell fluid pressure drop is encountered for ϴ =90° HE. Furthermore, the highest pumping power per unit heat transfer area for coil and shell fluids are noted for ϴ= 0° HE and ϴ= 90°HE, respectively, while ϴ= 30° HCCHE exhibits comparable performance to the remaining HEs within the specified parameter range, establishing its optimality.https://jhmtr.semnan.ac.ir/article_8625_3935e16110db3d9820e1103e425df982.pdfcurvature ratiodean numbereffectivenesshelical cone coil (hcc)pressure drop |
| spellingShingle | Susheel Madhavrao Magar Gaurav Kumar Gugliani Ravindra Rambhau Navthar Experimental Heat Transfer Analysis of Helical Coiled Tubes on the Basis of Variation in Curvature Ratio and Geometry Journal of Heat and Mass Transfer Research curvature ratio dean number effectiveness helical cone coil (hcc) pressure drop |
| title | Experimental Heat Transfer Analysis of Helical Coiled Tubes on the Basis of Variation in Curvature Ratio and Geometry |
| title_full | Experimental Heat Transfer Analysis of Helical Coiled Tubes on the Basis of Variation in Curvature Ratio and Geometry |
| title_fullStr | Experimental Heat Transfer Analysis of Helical Coiled Tubes on the Basis of Variation in Curvature Ratio and Geometry |
| title_full_unstemmed | Experimental Heat Transfer Analysis of Helical Coiled Tubes on the Basis of Variation in Curvature Ratio and Geometry |
| title_short | Experimental Heat Transfer Analysis of Helical Coiled Tubes on the Basis of Variation in Curvature Ratio and Geometry |
| title_sort | experimental heat transfer analysis of helical coiled tubes on the basis of variation in curvature ratio and geometry |
| topic | curvature ratio dean number effectiveness helical cone coil (hcc) pressure drop |
| url | https://jhmtr.semnan.ac.ir/article_8625_3935e16110db3d9820e1103e425df982.pdf |
| work_keys_str_mv | AT susheelmadhavraomagar experimentalheattransferanalysisofhelicalcoiledtubesonthebasisofvariationincurvatureratioandgeometry AT gauravkumargugliani experimentalheattransferanalysisofhelicalcoiledtubesonthebasisofvariationincurvatureratioandgeometry AT ravindrarambhaunavthar experimentalheattransferanalysisofhelicalcoiledtubesonthebasisofvariationincurvatureratioandgeometry |