Periodic Unsteady Natural Convection on CNT Nano-powder Liquid in a Triangular Shaped Mechanical Chamber
Nanoparticle is highly used in enhancing thermal performance, especially in lid-driven cavity flow in powder-related applications. Many researchers considered different conditions, such as MHD, radiation, and mixed convection incorporating nano liquid in such flow. However, no study was carried out...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-08-01
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| Series: | International Journal of Thermofluids |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666202722000453 |
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| author | Md. Jahid Hasan A.K. Azad Zahurul Islam Rumman Hossain M.M. Rahman |
| author_facet | Md. Jahid Hasan A.K. Azad Zahurul Islam Rumman Hossain M.M. Rahman |
| author_sort | Md. Jahid Hasan |
| collection | DOAJ |
| description | Nanoparticle is highly used in enhancing thermal performance, especially in lid-driven cavity flow in powder-related applications. Many researchers considered different conditions, such as MHD, radiation, and mixed convection incorporating nano liquid in such flow. However, no study was carried out with CNT-water nano liquid in a triangular cavity, heated sinusoidally under natural convection to determine the Rayleigh number (Ra) and nano-powder liquid concentration effect on heat transfer. As a result, this study attempts to find the Rayleigh number and particle concentration effects in such transient cavity flow. The governing equations were employed with the Galerkin residual method. While calculating the thermal conductivity and dynamic viscosity of the nano liquid, Brownian motion was taken into consideration. The four solid volume fractions (0.01, 0.05, 0.1, 0.15) and the Ra (104 ≤ Ra ≤ 106) were chosen to evaluate the impact within dimensionless time (0.1 ≤ τ ≤ 1). The findings have been shown by plotting the streamlines, isotherms, heat transfer variation, and pressure gradient. It is found that when the Rayleigh number goes up, the velocity, vorticity, and pressure gradient magnitude become high. But, the fluid flow vortices decrease with dimensionless time. Due to the sinusoidal heat flux conditions, the variation of the result was found to be sinusoidal as well. When the nanoparticle concentration rises, the heat transfer rate and average fluid temperature also increase. Therefore, the highest heat transfer rate is found using the nano liquid with a15% concentration. |
| first_indexed | 2024-12-11T00:01:12Z |
| format | Article |
| id | doaj.art-61410a104b08445db24b3ba8162ef716 |
| institution | Directory Open Access Journal |
| issn | 2666-2027 |
| language | English |
| last_indexed | 2024-12-11T00:01:12Z |
| publishDate | 2022-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Thermofluids |
| spelling | doaj.art-61410a104b08445db24b3ba8162ef7162022-12-22T01:28:28ZengElsevierInternational Journal of Thermofluids2666-20272022-08-0115100181Periodic Unsteady Natural Convection on CNT Nano-powder Liquid in a Triangular Shaped Mechanical ChamberMd. Jahid Hasan0A.K. Azad1Zahurul Islam2Rumman Hossain3M.M. Rahman4Department of Mechanical and Production Engineering, Islamic University of Technology, Board Bazar, Gazipur, 1704, BangladeshDepartment of Natural Sciences, Islamic University of Technology, Board Bazar, Gazipur, 1704, BangladeshDepartment of Mathematics, Bangladesh University of Engineering and Technology, Dhaka, 1000, BangladeshDepartment of Mathematics, Bangladesh University of Engineering and Technology, Dhaka, 1000, BangladeshDepartment of Mathematics, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh; Corresponding author: Dr M.M. Rahman. Mathematics Bangladesh University of Engineering and Technology Dhaka, Dhaka District DHAKA, 1000, BangladeshNanoparticle is highly used in enhancing thermal performance, especially in lid-driven cavity flow in powder-related applications. Many researchers considered different conditions, such as MHD, radiation, and mixed convection incorporating nano liquid in such flow. However, no study was carried out with CNT-water nano liquid in a triangular cavity, heated sinusoidally under natural convection to determine the Rayleigh number (Ra) and nano-powder liquid concentration effect on heat transfer. As a result, this study attempts to find the Rayleigh number and particle concentration effects in such transient cavity flow. The governing equations were employed with the Galerkin residual method. While calculating the thermal conductivity and dynamic viscosity of the nano liquid, Brownian motion was taken into consideration. The four solid volume fractions (0.01, 0.05, 0.1, 0.15) and the Ra (104 ≤ Ra ≤ 106) were chosen to evaluate the impact within dimensionless time (0.1 ≤ τ ≤ 1). The findings have been shown by plotting the streamlines, isotherms, heat transfer variation, and pressure gradient. It is found that when the Rayleigh number goes up, the velocity, vorticity, and pressure gradient magnitude become high. But, the fluid flow vortices decrease with dimensionless time. Due to the sinusoidal heat flux conditions, the variation of the result was found to be sinusoidal as well. When the nanoparticle concentration rises, the heat transfer rate and average fluid temperature also increase. Therefore, the highest heat transfer rate is found using the nano liquid with a15% concentration.http://www.sciencedirect.com/science/article/pii/S2666202722000453Sinusoidal heat sourceCNT-water nano-powder liquidNatural convectionRayleigh numberPeriodic behavior |
| spellingShingle | Md. Jahid Hasan A.K. Azad Zahurul Islam Rumman Hossain M.M. Rahman Periodic Unsteady Natural Convection on CNT Nano-powder Liquid in a Triangular Shaped Mechanical Chamber International Journal of Thermofluids Sinusoidal heat source CNT-water nano-powder liquid Natural convection Rayleigh number Periodic behavior |
| title | Periodic Unsteady Natural Convection on CNT Nano-powder Liquid in a Triangular Shaped Mechanical Chamber |
| title_full | Periodic Unsteady Natural Convection on CNT Nano-powder Liquid in a Triangular Shaped Mechanical Chamber |
| title_fullStr | Periodic Unsteady Natural Convection on CNT Nano-powder Liquid in a Triangular Shaped Mechanical Chamber |
| title_full_unstemmed | Periodic Unsteady Natural Convection on CNT Nano-powder Liquid in a Triangular Shaped Mechanical Chamber |
| title_short | Periodic Unsteady Natural Convection on CNT Nano-powder Liquid in a Triangular Shaped Mechanical Chamber |
| title_sort | periodic unsteady natural convection on cnt nano powder liquid in a triangular shaped mechanical chamber |
| topic | Sinusoidal heat source CNT-water nano-powder liquid Natural convection Rayleigh number Periodic behavior |
| url | http://www.sciencedirect.com/science/article/pii/S2666202722000453 |
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