Numerical Study on Thermal Performance of Water Flow in a Twisted Duct Heat Exchanger
This paper presents a numerical study of heat transfer through a downstream annulus using water as the working fluid within the laminar flow region. The annulus consisted of an outer twisted square duct and an inner circular pipe. A three-dimensional formulation was used to solve the Navier-Stokes e...
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| Format: | Article |
| Language: | English |
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University of Zielona Góra
2022-06-01
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| Series: | International Journal of Applied Mechanics and Engineering |
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| Online Access: | https://www.ijame-poland.com/Numerical-Study-on-Thermal-Performance-of-Water-Flow-in-a-Twisted-Duct-Heat-Exchanger,166717,0,2.html |
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| author | Musaab K. Rashed Kadhum Audaa Jehhef Faris Ali Badawy |
| author_facet | Musaab K. Rashed Kadhum Audaa Jehhef Faris Ali Badawy |
| author_sort | Musaab K. Rashed |
| collection | DOAJ |
| description | This paper presents a numerical study of heat transfer through a downstream annulus using water as the working fluid within the laminar flow region. The annulus consisted of an outer twisted square duct and an inner circular pipe. A three-dimensional formulation was used to solve the Navier-Stokes equations numerically for the laminar flow system with a low Reynolds number. Three parameters were used in the numerical simulation: the length of the twisted square ( a : 6.6 , 8.2 10.2, 12.6 mm ) the inner diameter of the inner circular pipe ( d : 19, 21, 23 and 25 mm ); and the twist angle (θ: 0 ° (smooth), 45 °, 60 °, and 90 °). Numerical calculations were conducted on sixteen twisted square duct heat exchangers, with water flowing within a Reynolds number range of 220 – 1100 . The results were illustrated as a profile of the thermal enhancement factor, the friction factor and the Nusselt number. The results show that the twisted outer duct of the heat exchanger can create a swirl flow along the length of the heat exchanger. It also caused a boundary layer separation-reattachment on the wall of the inner pipe. Moreover, an increase in the twist angle increased the Nusselt number by 20 %, and the friction factor was also increased as the annular gap of the heat exchanger decreased. |
| first_indexed | 2024-03-12T16:33:59Z |
| format | Article |
| id | doaj.art-ec4e6b5d1bff4cbf92d1f971a1c5ab76 |
| institution | Directory Open Access Journal |
| issn | 1734-4492 2353-9003 |
| language | English |
| last_indexed | 2024-03-12T16:33:59Z |
| publishDate | 2022-06-01 |
| publisher | University of Zielona Góra |
| record_format | Article |
| series | International Journal of Applied Mechanics and Engineering |
| spelling | doaj.art-ec4e6b5d1bff4cbf92d1f971a1c5ab762023-08-08T15:04:49ZengUniversity of Zielona GóraInternational Journal of Applied Mechanics and Engineering1734-44922353-90032022-06-0127219921610.2478/ijame-2022-0028166717Numerical Study on Thermal Performance of Water Flow in a Twisted Duct Heat ExchangerMusaab K. Rashed0Kadhum Audaa Jehhef1Faris Ali Badawy2Middle Technical University, Institute of Technology, Baghdad/ Iraq.Middle Technical University, Institute of Technology, Baghdad/ Iraq.Middle Technical University, Institute of Technology, Baghdad/ Iraq.This paper presents a numerical study of heat transfer through a downstream annulus using water as the working fluid within the laminar flow region. The annulus consisted of an outer twisted square duct and an inner circular pipe. A three-dimensional formulation was used to solve the Navier-Stokes equations numerically for the laminar flow system with a low Reynolds number. Three parameters were used in the numerical simulation: the length of the twisted square ( a : 6.6 , 8.2 10.2, 12.6 mm ) the inner diameter of the inner circular pipe ( d : 19, 21, 23 and 25 mm ); and the twist angle (θ: 0 ° (smooth), 45 °, 60 °, and 90 °). Numerical calculations were conducted on sixteen twisted square duct heat exchangers, with water flowing within a Reynolds number range of 220 – 1100 . The results were illustrated as a profile of the thermal enhancement factor, the friction factor and the Nusselt number. The results show that the twisted outer duct of the heat exchanger can create a swirl flow along the length of the heat exchanger. It also caused a boundary layer separation-reattachment on the wall of the inner pipe. Moreover, an increase in the twist angle increased the Nusselt number by 20 %, and the friction factor was also increased as the annular gap of the heat exchanger decreased.https://www.ijame-poland.com/Numerical-Study-on-Thermal-Performance-of-Water-Flow-in-a-Twisted-Duct-Heat-Exchanger,166717,0,2.htmlmixed convectiontwisted square ductheat exchangerlaminar flow |
| spellingShingle | Musaab K. Rashed Kadhum Audaa Jehhef Faris Ali Badawy Numerical Study on Thermal Performance of Water Flow in a Twisted Duct Heat Exchanger International Journal of Applied Mechanics and Engineering mixed convection twisted square duct heat exchanger laminar flow |
| title | Numerical Study on Thermal Performance of Water Flow in a Twisted Duct Heat Exchanger |
| title_full | Numerical Study on Thermal Performance of Water Flow in a Twisted Duct Heat Exchanger |
| title_fullStr | Numerical Study on Thermal Performance of Water Flow in a Twisted Duct Heat Exchanger |
| title_full_unstemmed | Numerical Study on Thermal Performance of Water Flow in a Twisted Duct Heat Exchanger |
| title_short | Numerical Study on Thermal Performance of Water Flow in a Twisted Duct Heat Exchanger |
| title_sort | numerical study on thermal performance of water flow in a twisted duct heat exchanger |
| topic | mixed convection twisted square duct heat exchanger laminar flow |
| url | https://www.ijame-poland.com/Numerical-Study-on-Thermal-Performance-of-Water-Flow-in-a-Twisted-Duct-Heat-Exchanger,166717,0,2.html |
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