Development of improved heat transfer of double helical pipe heat exchangers using nano-fluids and perforated curved tabulators
This study examines a helical double-pipe heat exchanger's thermal and fluid flow performance incorporating a curved perforated turbulator and hybrid nanofluids. Two nanofluids, Al2O3-TiO2/water, and Ag-HEG/water, were compared with pure water and a baseline case without a turbulator to evaluat...
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| Language: | English |
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Elsevier
2025-06-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X25003661 |
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| author | Lotfi Ben Said Ali B.M. Ali As'ad Alizadeh Kuwar Mausam Saurav Dixit Rifaqat Ali Mohammed A. Tashkandi Lioua Kolsi |
| author_facet | Lotfi Ben Said Ali B.M. Ali As'ad Alizadeh Kuwar Mausam Saurav Dixit Rifaqat Ali Mohammed A. Tashkandi Lioua Kolsi |
| author_sort | Lotfi Ben Said |
| collection | DOAJ |
| description | This study examines a helical double-pipe heat exchanger's thermal and fluid flow performance incorporating a curved perforated turbulator and hybrid nanofluids. Two nanofluids, Al2O3-TiO2/water, and Ag-HEG/water, were compared with pure water and a baseline case without a turbulator to evaluate heat transfer enhancement. The research is divided into two phases. In the first phase, the thermal and hydrothermal behavior of two hybrid nanofluids—Al2O3-TiO2/water and Ag-HEG/water—was evaluated and compared to pure water and a baseline case without turbulators to assess their effectiveness. In the second phase, the influence of nanoparticle volume concentration (φ1 = φ2) of the selected hybrid nanofluid according to the results obtained from the first section, Al2O3-TiO2/water, was analyzed over a range of 0.1–0.5. The curved turbulator, featuring inner ribs and perforations, was designed to induce swirl flows, enhance fluid mixing, and disrupt thermal boundary layers to improve heat transfer. The numerical analysis was performed using the finite volume method in a commercial code. The findings of the first section show that Al2O3-TiO2/water achieves the highest heat transfer rate; its heat transfer coefficient is about 1.04 %, 2.63 %, and 18.19 % greater than cases with Ag-HEG/water, pure water, and without turbulator, respectively at Re = 14,000. However, the thermal performance factor of the case without a turbulator is more significant than that of all models because of the high pressure drop in all cases, including the proposed turbulator. In the second phase, the outcomes illustrate that by raising the volume concentration of Al2O3-TiO2/water hybrid nanofluid from 0.1 to 0.3 (200 % growth) and 0.5 (400 % growth), the heat transfer coefficient augments by about 1.56 % and 3.65 %, respectively. Concerning the thermal performance factor, although increasing the volume concentration does not help to improve it compared to the case without a turbulator, expanding the volume concentration from 0.1 to 0.3 leads to an increase in the thermal performance factor by about 5.85 % at Re = 10,000. |
| format | Article |
| id | doaj-art-cf5123c986a543e8b3f37e1ed44f8f6d |
| institution | OA Journals |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-cf5123c986a543e8b3f37e1ed44f8f6d2025-08-20T01:48:30ZengElsevierCase Studies in Thermal Engineering2214-157X2025-06-017010610610.1016/j.csite.2025.106106Development of improved heat transfer of double helical pipe heat exchangers using nano-fluids and perforated curved tabulatorsLotfi Ben Said0Ali B.M. Ali1As'ad Alizadeh2Kuwar Mausam3Saurav Dixit4Rifaqat Ali5Mohammed A. Tashkandi6Lioua Kolsi7Department of Mechanical Engineering, College of Engineering, University of Ha'il, Ha'il City, 81451, Saudi ArabiaAir Conditioning Engineering Department, College of Engineering, University of Warith Al-Anbiyaa, Karbala, IraqDepartment of Civil Engineering, College of Engineering, Cihan University-Erbil, Erbil, Iraq; Corresponding author.Department of Mechanical Engineering, Institute of Engineering and Technology, GLA University, Mathura, U.P., 281406, IndiaCentre of Research Impact and Outcome, Chitkara University, Rajpura, 140417, Punjab, IndiaDepartment of Mathematics, Applied College in Mohayil Asir, King Khalid University, Abha, Saudi ArabiaMechanical Engineering Department, College of Engineering, Northern Border University, Arar, Saudi ArabiaDepartment of Mechanical Engineering, College of Engineering, University of Ha'il, Ha'il City, 81451, Saudi ArabiaThis study examines a helical double-pipe heat exchanger's thermal and fluid flow performance incorporating a curved perforated turbulator and hybrid nanofluids. Two nanofluids, Al2O3-TiO2/water, and Ag-HEG/water, were compared with pure water and a baseline case without a turbulator to evaluate heat transfer enhancement. The research is divided into two phases. In the first phase, the thermal and hydrothermal behavior of two hybrid nanofluids—Al2O3-TiO2/water and Ag-HEG/water—was evaluated and compared to pure water and a baseline case without turbulators to assess their effectiveness. In the second phase, the influence of nanoparticle volume concentration (φ1 = φ2) of the selected hybrid nanofluid according to the results obtained from the first section, Al2O3-TiO2/water, was analyzed over a range of 0.1–0.5. The curved turbulator, featuring inner ribs and perforations, was designed to induce swirl flows, enhance fluid mixing, and disrupt thermal boundary layers to improve heat transfer. The numerical analysis was performed using the finite volume method in a commercial code. The findings of the first section show that Al2O3-TiO2/water achieves the highest heat transfer rate; its heat transfer coefficient is about 1.04 %, 2.63 %, and 18.19 % greater than cases with Ag-HEG/water, pure water, and without turbulator, respectively at Re = 14,000. However, the thermal performance factor of the case without a turbulator is more significant than that of all models because of the high pressure drop in all cases, including the proposed turbulator. In the second phase, the outcomes illustrate that by raising the volume concentration of Al2O3-TiO2/water hybrid nanofluid from 0.1 to 0.3 (200 % growth) and 0.5 (400 % growth), the heat transfer coefficient augments by about 1.56 % and 3.65 %, respectively. Concerning the thermal performance factor, although increasing the volume concentration does not help to improve it compared to the case without a turbulator, expanding the volume concentration from 0.1 to 0.3 leads to an increase in the thermal performance factor by about 5.85 % at Re = 10,000.http://www.sciencedirect.com/science/article/pii/S2214157X25003661Double-tube heat exchangerTurbulatorVortex generatorHybrid nanofluidThermal performanceNumerical examination |
| spellingShingle | Lotfi Ben Said Ali B.M. Ali As'ad Alizadeh Kuwar Mausam Saurav Dixit Rifaqat Ali Mohammed A. Tashkandi Lioua Kolsi Development of improved heat transfer of double helical pipe heat exchangers using nano-fluids and perforated curved tabulators Case Studies in Thermal Engineering Double-tube heat exchanger Turbulator Vortex generator Hybrid nanofluid Thermal performance Numerical examination |
| title | Development of improved heat transfer of double helical pipe heat exchangers using nano-fluids and perforated curved tabulators |
| title_full | Development of improved heat transfer of double helical pipe heat exchangers using nano-fluids and perforated curved tabulators |
| title_fullStr | Development of improved heat transfer of double helical pipe heat exchangers using nano-fluids and perforated curved tabulators |
| title_full_unstemmed | Development of improved heat transfer of double helical pipe heat exchangers using nano-fluids and perforated curved tabulators |
| title_short | Development of improved heat transfer of double helical pipe heat exchangers using nano-fluids and perforated curved tabulators |
| title_sort | development of improved heat transfer of double helical pipe heat exchangers using nano fluids and perforated curved tabulators |
| topic | Double-tube heat exchanger Turbulator Vortex generator Hybrid nanofluid Thermal performance Numerical examination |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X25003661 |
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