Numerical study of heat transfer, pressure drop and entropy production characteristics in inclined heat exchangers with uniform heat flux using mango bark/CO2 nanofluid
For sustainable low-carbon cities, using sustainable urban energy system solutions is imperative. CO2-based bionanofluid is one proposed energy system solution that is sustainable and environmentally friendly. This paper examines the thermal-hydraulic and entropy production properties of mango bark/...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-08-01
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| Series: | Heliyon |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844023059029 |
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| author | Okwesilieze Uwadoka Adekunle O. Adelaja Olabode T. Olakoyejo Opeyemi L. Fadipe Steven Efe |
| author_facet | Okwesilieze Uwadoka Adekunle O. Adelaja Olabode T. Olakoyejo Opeyemi L. Fadipe Steven Efe |
| author_sort | Okwesilieze Uwadoka |
| collection | DOAJ |
| description | For sustainable low-carbon cities, using sustainable urban energy system solutions is imperative. CO2-based bionanofluid is one proposed energy system solution that is sustainable and environmentally friendly. This paper examines the thermal-hydraulic and entropy production properties of mango bark/CO2 nanofluid for industrial-inclined gas cooling applications. The influence of gravitational force (in terms of tube inclination angle), volume fraction, and Reynolds number on the heat transfer, pressure drop, and entropy production of CO2-based mango bark nanofluids in laminar flow through a circular aluminum tube are numerically studied. The bionanofluid flows through a tube with an inner radius of 2.25 mm, a length of 970.0 mm, and an initial temperature of 320.0 K. A constant heat flux of −10.0 W/m2 is applied to the flow at its walls. The laminar flow regime with Reynolds numbers of 100, 400, 700, and 1000 are subjected to flow inclinations of ±90°, ±60°, ±45°, ±30°, and 0° and bionanofluid volume fractions of 0.5%, 1.0%, and 2.0%. Results show that ±45° tube inclination angle offers the optimal heat transfer coefficient, maximum pressure drop, and minimum total entropy production rates for Re > 100; however, for Re = 100, these occur at the inclination angle of −30° and +60°. The pressure drop shows less sensitivity to the inclination angle; however, it offers peak values at the same inclination angles as the heat transfer coefficient for the respective Reynolds number values. The maximum thermal enhancements due to gravitational effect are 42%, 93.98%, 121.28%, and 150% for Reynolds numbers of 100, 400, 700, and 1000, respectively, while that due to nanofluid volume fraction are less than 16%. |
| first_indexed | 2024-03-12T12:21:28Z |
| format | Article |
| id | doaj.art-361b3b612fd04d7e8450ccdfaf0d993a |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-03-12T12:21:28Z |
| publishDate | 2023-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-361b3b612fd04d7e8450ccdfaf0d993a2023-08-30T05:52:14ZengElsevierHeliyon2405-84402023-08-0198e18694Numerical study of heat transfer, pressure drop and entropy production characteristics in inclined heat exchangers with uniform heat flux using mango bark/CO2 nanofluidOkwesilieze Uwadoka0Adekunle O. Adelaja1Olabode T. Olakoyejo2Opeyemi L. Fadipe3Steven Efe4Department of Mechanical Engineering, University of Lagos, Akoka, Lagos State, 100213, NigeriaDepartment of Mechanical Engineering, University of Lagos, Akoka, Lagos State, 100213, Nigeria; Faculty of Engineering and the Built Environment, Durban University of Technology, PO Box 1334, Durban, 4000, South Africa; Corresponding author. Department of Mechanical Engineering, University of Lagos, Akoka, Lagos State, 100213, Nigeria.Department of Mechanical Engineering, University of Lagos, Akoka, Lagos State, 100213, NigeriaDepartment of Industrial and Systems Engineering, Morgan State University, 1700 East Cold Spring Lane, Baltimore, MD, USADepartment of Civil Engineering, Morgan State University, 1700 East Cold Spring Lane, Baltimore, MD, USAFor sustainable low-carbon cities, using sustainable urban energy system solutions is imperative. CO2-based bionanofluid is one proposed energy system solution that is sustainable and environmentally friendly. This paper examines the thermal-hydraulic and entropy production properties of mango bark/CO2 nanofluid for industrial-inclined gas cooling applications. The influence of gravitational force (in terms of tube inclination angle), volume fraction, and Reynolds number on the heat transfer, pressure drop, and entropy production of CO2-based mango bark nanofluids in laminar flow through a circular aluminum tube are numerically studied. The bionanofluid flows through a tube with an inner radius of 2.25 mm, a length of 970.0 mm, and an initial temperature of 320.0 K. A constant heat flux of −10.0 W/m2 is applied to the flow at its walls. The laminar flow regime with Reynolds numbers of 100, 400, 700, and 1000 are subjected to flow inclinations of ±90°, ±60°, ±45°, ±30°, and 0° and bionanofluid volume fractions of 0.5%, 1.0%, and 2.0%. Results show that ±45° tube inclination angle offers the optimal heat transfer coefficient, maximum pressure drop, and minimum total entropy production rates for Re > 100; however, for Re = 100, these occur at the inclination angle of −30° and +60°. The pressure drop shows less sensitivity to the inclination angle; however, it offers peak values at the same inclination angles as the heat transfer coefficient for the respective Reynolds number values. The maximum thermal enhancements due to gravitational effect are 42%, 93.98%, 121.28%, and 150% for Reynolds numbers of 100, 400, 700, and 1000, respectively, while that due to nanofluid volume fraction are less than 16%.http://www.sciencedirect.com/science/article/pii/S2405844023059029Convective heat transferGas coolingGravitational forceHeat transfer enhancementInclined flowMango bark/CO2 nanofluid |
| spellingShingle | Okwesilieze Uwadoka Adekunle O. Adelaja Olabode T. Olakoyejo Opeyemi L. Fadipe Steven Efe Numerical study of heat transfer, pressure drop and entropy production characteristics in inclined heat exchangers with uniform heat flux using mango bark/CO2 nanofluid Heliyon Convective heat transfer Gas cooling Gravitational force Heat transfer enhancement Inclined flow Mango bark/CO2 nanofluid |
| title | Numerical study of heat transfer, pressure drop and entropy production characteristics in inclined heat exchangers with uniform heat flux using mango bark/CO2 nanofluid |
| title_full | Numerical study of heat transfer, pressure drop and entropy production characteristics in inclined heat exchangers with uniform heat flux using mango bark/CO2 nanofluid |
| title_fullStr | Numerical study of heat transfer, pressure drop and entropy production characteristics in inclined heat exchangers with uniform heat flux using mango bark/CO2 nanofluid |
| title_full_unstemmed | Numerical study of heat transfer, pressure drop and entropy production characteristics in inclined heat exchangers with uniform heat flux using mango bark/CO2 nanofluid |
| title_short | Numerical study of heat transfer, pressure drop and entropy production characteristics in inclined heat exchangers with uniform heat flux using mango bark/CO2 nanofluid |
| title_sort | numerical study of heat transfer pressure drop and entropy production characteristics in inclined heat exchangers with uniform heat flux using mango bark co2 nanofluid |
| topic | Convective heat transfer Gas cooling Gravitational force Heat transfer enhancement Inclined flow Mango bark/CO2 nanofluid |
| url | http://www.sciencedirect.com/science/article/pii/S2405844023059029 |
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