The thermal-flow performance of water-Al2O3 nanofluid flow in an elliptical duct heat exchanger equipped with two rotating twisted tapes
Background: The thermal-flow performance of nanofluid (NF) flow in an elliptical duct heat exchanger fitted and turbulated with two rotating tapes is investigated. The issues concerning rotating twisted tapes inside the oval tubes using NF as the working fluid simulated with two-phase modeling have...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-06-01
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| Series: | Case Studies in Chemical and Environmental Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666016425000015 |
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| author | Hassan Wathiq Ayoob Ihab Omar Wed khalid Ghanim Mohammad N. Fares Mohammad Ali Fazilati Soheil Salahshour Sh Esmaeili |
| author_facet | Hassan Wathiq Ayoob Ihab Omar Wed khalid Ghanim Mohammad N. Fares Mohammad Ali Fazilati Soheil Salahshour Sh Esmaeili |
| author_sort | Hassan Wathiq Ayoob |
| collection | DOAJ |
| description | Background: The thermal-flow performance of nanofluid (NF) flow in an elliptical duct heat exchanger fitted and turbulated with two rotating tapes is investigated. The issues concerning rotating twisted tapes inside the oval tubes using NF as the working fluid simulated with two-phase modeling have received less attention in previous studies. Methods: Considering the importance of employing the heat transfer improving methods in tubular heat exchangers, the passive and ative heat transfer improving methods examined here. As a novel study case, the rotated tapes beside the water-Al2O3 NF of was used; and sensitivity analysis was performed to reveal the effect of the volume fraction of nanoparticles (ϕ), tapes rotational speed and Re number on the Nu number, pumping power and figure of merit (FOM). The heat flux of 5000 Wm−2 was applied to the wall surface, and the two-phase mixture method was employed for the simulation. The heat exchanger performance is studied in cases of fixed and rotating twisted tapes with three different rotational speeds. The results show that increasing the Re number, ϕ and the rotation speed of the blades would increase the Nu number and pumping power in all cases. The increase in ϕ improves the Nu number by 6.1 %–19.4 % and the pumping power by 59.2–280 %. The Nu number change by increasing ϕ is lower at low Re numbers and becomes higher at high Re numbers. The effect of ϕ increment on heat transfer is increasing but took place with a higher inclination rate in rotating tapes rather than stationary tapes and plain tube cases. In the cases of rotated twisted tape mode, the value of FOM is always greater than one and is below 0.9 for stationary mode. Significant findings: The highest value of FOM is 1.57, which is for the highest rotational speeds, the lowest Re number, and ϕ = 1 %. Increasing the Re number reduces the FOM while increasing ϕ improves it. Practical significance and potential area of application: The increasing need for efficient heat transfer in heat exchanger devices necessitated the application of heat transfer augmentation techniques. The effects of twisted tapes, their rotation, and the application of NFs in heat exchangers as the active and passive heat transfer increment methods are studied numerically. |
| format | Article |
| id | doaj-art-ec6c0ac209ef44e8ab118f6bbefd5353 |
| institution | Kabale University |
| issn | 2666-0164 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
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| series | Case Studies in Chemical and Environmental Engineering |
| spelling | doaj-art-ec6c0ac209ef44e8ab118f6bbefd53532025-01-09T06:14:35ZengElsevierCase Studies in Chemical and Environmental Engineering2666-01642025-06-0111101094The thermal-flow performance of water-Al2O3 nanofluid flow in an elliptical duct heat exchanger equipped with two rotating twisted tapesHassan Wathiq Ayoob0Ihab Omar1Wed khalid Ghanim2Mohammad N. Fares3Mohammad Ali Fazilati4Soheil Salahshour5Sh Esmaeili6Chemical Engineering Department, University of Basrah, Basrah, 61001, IraqAir Conditioning Engineering Department, Faculty of Engineering, Warith Al-Anbiyaa University, Karbala, 56001, IraqChemical Engineering Department, University of Basrah, Basrah, 61001, IraqChemical Engineering Department, University of Basrah, Basrah, 61001, IraqDepartment of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran; Corresponding AuthorFaculty of Engineering and Natural Sciences, Istanbul Okan University, Istanbul, Turkey; Faculty of Engineering and Natural Sciences, Bahcesehir University, Istanbul, Turkey; Faculty of Science and Letters, Piri Reis University, Tuzla, Istanbul, TurkeyFaculty of Physics, Semnan University, P.O. Box: 35195-363, Semnan, Iran; Corresponding author.Background: The thermal-flow performance of nanofluid (NF) flow in an elliptical duct heat exchanger fitted and turbulated with two rotating tapes is investigated. The issues concerning rotating twisted tapes inside the oval tubes using NF as the working fluid simulated with two-phase modeling have received less attention in previous studies. Methods: Considering the importance of employing the heat transfer improving methods in tubular heat exchangers, the passive and ative heat transfer improving methods examined here. As a novel study case, the rotated tapes beside the water-Al2O3 NF of was used; and sensitivity analysis was performed to reveal the effect of the volume fraction of nanoparticles (ϕ), tapes rotational speed and Re number on the Nu number, pumping power and figure of merit (FOM). The heat flux of 5000 Wm−2 was applied to the wall surface, and the two-phase mixture method was employed for the simulation. The heat exchanger performance is studied in cases of fixed and rotating twisted tapes with three different rotational speeds. The results show that increasing the Re number, ϕ and the rotation speed of the blades would increase the Nu number and pumping power in all cases. The increase in ϕ improves the Nu number by 6.1 %–19.4 % and the pumping power by 59.2–280 %. The Nu number change by increasing ϕ is lower at low Re numbers and becomes higher at high Re numbers. The effect of ϕ increment on heat transfer is increasing but took place with a higher inclination rate in rotating tapes rather than stationary tapes and plain tube cases. In the cases of rotated twisted tape mode, the value of FOM is always greater than one and is below 0.9 for stationary mode. Significant findings: The highest value of FOM is 1.57, which is for the highest rotational speeds, the lowest Re number, and ϕ = 1 %. Increasing the Re number reduces the FOM while increasing ϕ improves it. Practical significance and potential area of application: The increasing need for efficient heat transfer in heat exchanger devices necessitated the application of heat transfer augmentation techniques. The effects of twisted tapes, their rotation, and the application of NFs in heat exchangers as the active and passive heat transfer increment methods are studied numerically.http://www.sciencedirect.com/science/article/pii/S2666016425000015Nanofluid flowElliptical duct heat exchangerRotating twisted tapesNumerical analysisNusselt number |
| spellingShingle | Hassan Wathiq Ayoob Ihab Omar Wed khalid Ghanim Mohammad N. Fares Mohammad Ali Fazilati Soheil Salahshour Sh Esmaeili The thermal-flow performance of water-Al2O3 nanofluid flow in an elliptical duct heat exchanger equipped with two rotating twisted tapes Case Studies in Chemical and Environmental Engineering Nanofluid flow Elliptical duct heat exchanger Rotating twisted tapes Numerical analysis Nusselt number |
| title | The thermal-flow performance of water-Al2O3 nanofluid flow in an elliptical duct heat exchanger equipped with two rotating twisted tapes |
| title_full | The thermal-flow performance of water-Al2O3 nanofluid flow in an elliptical duct heat exchanger equipped with two rotating twisted tapes |
| title_fullStr | The thermal-flow performance of water-Al2O3 nanofluid flow in an elliptical duct heat exchanger equipped with two rotating twisted tapes |
| title_full_unstemmed | The thermal-flow performance of water-Al2O3 nanofluid flow in an elliptical duct heat exchanger equipped with two rotating twisted tapes |
| title_short | The thermal-flow performance of water-Al2O3 nanofluid flow in an elliptical duct heat exchanger equipped with two rotating twisted tapes |
| title_sort | thermal flow performance of water al2o3 nanofluid flow in an elliptical duct heat exchanger equipped with two rotating twisted tapes |
| topic | Nanofluid flow Elliptical duct heat exchanger Rotating twisted tapes Numerical analysis Nusselt number |
| url | http://www.sciencedirect.com/science/article/pii/S2666016425000015 |
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