Thermo-hydrodynamic characteristics and entropy generation in a tube heat exchanger using multiple head ribbed geometries
Heat exchangers are critical components in a wide range of industries, and optimizing their thermal performance remains an important research area. To augment the thermal efficiency in a heat exchanger, several investigations have been done to increase the wetted surface area using a rib profile. St...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | South African Journal of Chemical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1026918523000550 |
| _version_ | 1827897718269280256 |
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| author | Md.Jahid Hasan Arafat A. Bhuiyan |
| author_facet | Md.Jahid Hasan Arafat A. Bhuiyan |
| author_sort | Md.Jahid Hasan |
| collection | DOAJ |
| description | Heat exchangers are critical components in a wide range of industries, and optimizing their thermal performance remains an important research area. To augment the thermal efficiency in a heat exchanger, several investigations have been done to increase the wetted surface area using a rib profile. Still, there exists a lack of research attempts to change the geometrical shape, such as multiple-head ribbed geometry with coil revolution in a straight heat exchanger. Therefore, the present study takes a numerical approach to examine the effect of multiple ribbed geometries, considering the variable coil revolution of the rib profile in a straight-type heat exchanger. The study was initially validated from two experimental correlations and previous numerical work. Three rib surfaces (2 ribs, 3 ribs and 4 ribs) and three different coil revolutions (10 revolutions, 20 revolutions and 30 revolutions) were taken into consideration to make nine configurations. Air was used as fluid under heating conditions. The results have been represented in terms of velocity, temperature profiles, local Nusselt number (Nu), pressure drop, friction factors and entropy generations for all the configurations. A significant enhancement in heat transfer was found when the rib head number is lesser, whereas the coil revolution number is higher. Consequently, the highest Nusselt number (Nu) was observed in the configuration of 2 ribbed 30 revolutions, and the lowest was found in 4 ribbed 10 revolutions. Furthermore, the friction factor rises because of higher coil revolution for a specific rib head number. It is found that in four rib head geometry, the friction factor rises 2 times when the revolution number is 30 than the case of revolution number 10. It is also observed that the 4 rib head 10 revolution configurations provides the lowest entropy generations among the configurations. Thus, the study suggests choosing the right configuration to design a straight heat exchanger with ribbed head profile to get the highest thermal performance. Following this study, these design modifications can be applied to other types of heat exchangers as well. |
| first_indexed | 2024-03-12T22:53:41Z |
| format | Article |
| id | doaj.art-1e0524b042424dbca5f1883f45c1ce36 |
| institution | Directory Open Access Journal |
| issn | 1026-9185 |
| language | English |
| last_indexed | 2024-03-12T22:53:41Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | South African Journal of Chemical Engineering |
| spelling | doaj.art-1e0524b042424dbca5f1883f45c1ce362023-07-20T04:37:44ZengElsevierSouth African Journal of Chemical Engineering1026-91852023-07-0145305314Thermo-hydrodynamic characteristics and entropy generation in a tube heat exchanger using multiple head ribbed geometriesMd.Jahid Hasan0Arafat A. Bhuiyan1Department of Mechanical and Production Engineering (MPE), Islamic University of Technology (IUT), Board Bazar, Gazipur 1704, BangladeshCorresponding author.; Department of Mechanical and Production Engineering (MPE), Islamic University of Technology (IUT), Board Bazar, Gazipur 1704, BangladeshHeat exchangers are critical components in a wide range of industries, and optimizing their thermal performance remains an important research area. To augment the thermal efficiency in a heat exchanger, several investigations have been done to increase the wetted surface area using a rib profile. Still, there exists a lack of research attempts to change the geometrical shape, such as multiple-head ribbed geometry with coil revolution in a straight heat exchanger. Therefore, the present study takes a numerical approach to examine the effect of multiple ribbed geometries, considering the variable coil revolution of the rib profile in a straight-type heat exchanger. The study was initially validated from two experimental correlations and previous numerical work. Three rib surfaces (2 ribs, 3 ribs and 4 ribs) and three different coil revolutions (10 revolutions, 20 revolutions and 30 revolutions) were taken into consideration to make nine configurations. Air was used as fluid under heating conditions. The results have been represented in terms of velocity, temperature profiles, local Nusselt number (Nu), pressure drop, friction factors and entropy generations for all the configurations. A significant enhancement in heat transfer was found when the rib head number is lesser, whereas the coil revolution number is higher. Consequently, the highest Nusselt number (Nu) was observed in the configuration of 2 ribbed 30 revolutions, and the lowest was found in 4 ribbed 10 revolutions. Furthermore, the friction factor rises because of higher coil revolution for a specific rib head number. It is found that in four rib head geometry, the friction factor rises 2 times when the revolution number is 30 than the case of revolution number 10. It is also observed that the 4 rib head 10 revolution configurations provides the lowest entropy generations among the configurations. Thus, the study suggests choosing the right configuration to design a straight heat exchanger with ribbed head profile to get the highest thermal performance. Following this study, these design modifications can be applied to other types of heat exchangers as well.http://www.sciencedirect.com/science/article/pii/S1026918523000550Entropy generationStraight heat exchangerNusselt numberMultiple-head ribbed tubeFriction factorForced convection |
| spellingShingle | Md.Jahid Hasan Arafat A. Bhuiyan Thermo-hydrodynamic characteristics and entropy generation in a tube heat exchanger using multiple head ribbed geometries South African Journal of Chemical Engineering Entropy generation Straight heat exchanger Nusselt number Multiple-head ribbed tube Friction factor Forced convection |
| title | Thermo-hydrodynamic characteristics and entropy generation in a tube heat exchanger using multiple head ribbed geometries |
| title_full | Thermo-hydrodynamic characteristics and entropy generation in a tube heat exchanger using multiple head ribbed geometries |
| title_fullStr | Thermo-hydrodynamic characteristics and entropy generation in a tube heat exchanger using multiple head ribbed geometries |
| title_full_unstemmed | Thermo-hydrodynamic characteristics and entropy generation in a tube heat exchanger using multiple head ribbed geometries |
| title_short | Thermo-hydrodynamic characteristics and entropy generation in a tube heat exchanger using multiple head ribbed geometries |
| title_sort | thermo hydrodynamic characteristics and entropy generation in a tube heat exchanger using multiple head ribbed geometries |
| topic | Entropy generation Straight heat exchanger Nusselt number Multiple-head ribbed tube Friction factor Forced convection |
| url | http://www.sciencedirect.com/science/article/pii/S1026918523000550 |
| work_keys_str_mv | AT mdjahidhasan thermohydrodynamiccharacteristicsandentropygenerationinatubeheatexchangerusingmultipleheadribbedgeometries AT arafatabhuiyan thermohydrodynamiccharacteristicsandentropygenerationinatubeheatexchangerusingmultipleheadribbedgeometries |