Numerical Study of Convection Air Currents Around a Hot Cylinder Inside a Triangular Cavity

Mohammed, Akeel Abdullah; Mohammed, A. A.; Channapattana, Shylesha

doi:10.29194/njes.26020102

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…Furthermore, NC flow is notably influenced by the presence of a cylinder within a cavity 27 . Moderres et al 28 examined the impact of a cylinder within a cavity on NC flow, revealing that the presence of the cylinder can alter the flow pattern and enhance heat and mass transfer.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal performance and entropy generation analysis in a novel cavity design with circular cylinder

Saha,

Jihan,

Ahammad

et al. 2024

Heat Trans

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Analyzing fluid dynamics and heat transfer holds significant importance in the design and enhancement of engineering systems. The current investigation utilizes the finite element method to explore natural convection and heat transfer intricacies within a novel cavity containing an inner circular cylinder under steady and laminar flow conditions. The principal aim of this study is to assess the impact of Rayleigh number (Ra), Bejan number (Be), and the presence of adiabatic, hot, and cold cylinders on heat transfer, entropy generation, and fluid flow. The range of Ra considered in this investigation spans from 103 to 106, while the Prandtl number for the air is fixed at 0.71. The findings illustrate that the presence of a cylinder leads to higher Be as Ra increase, compared to scenarios where no cylinder is present. This observation suggests that buoyancy forces dominate in the absence of a cylinder, resulting in significantly enhanced convective heat transfer efficiency. However, the presence of a heated cylinder within the tooth‐shaped cavity exerts a substantial influence on the overall thermal performance of the system. Notably, the average Nusselt Number (Nu) experiences a remarkable increase of 41.97% under the influence of a heated cylinder, when compared to situations where a cold cylinder is present. This elevated average Nu signifies improved heat transfer characteristics, ultimately resulting in an overall improvement in the thermal system's efficiency.

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Section: Introductionmentioning

confidence: 99%

Enhanced thermal performance and entropy generation analysis in a novel cavity design with circular cylinder

Saha,

Jihan,

Ahammad

et al. 2024

Heat Trans

View full text Add to dashboard Cite

show abstract

“…The search results provide several studies that investigate the effect of air velocity on heat transfer in different contexts, such as natural convection in an air channel with a cavity [34], heat transfer in a rectangular tube [35], and plate-fin heat sinks under forced air convection [36]. Other studies explore the effect of air velocity on heat transfer in cyclone heat exchangers [37], the throughflow effect on local and large-scale penetrative convection [38], and convection air currents around a hot cylinder inside a triangular cavity [39].…”

Section: Introductionmentioning

confidence: 99%

Heat Convection in a Channel-Opened Cavity with Two Heated Sources and Baffle

Rashid,

Al-Gaheeshi,

Mohammed

et al. 2024

Energies

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This study employs COMSOL software v 5.6 to investigate a novel approach to heat transfer via mixed convection in an open hollow structure with an unheated 90° baffle elbow. Two 20 W heat sources are strategically positioned on the cavity’s bottom and right-angled wall for this research. Notably, the orientation of the baffle perpendicular to the airflow is used to direct external, unrestricted flow into the square cavity. The research investigates a range of air velocities (0.1, 0.5, 1.0, and 1.5 m/s) and the intricate interaction between input air velocity, dual heated sources, and the presence of a right-angle baffle on critical thermodynamic variables, such as temperature distribution, isotherms, pressure variation, velocity profile, air density, and both local and mean Nusselt numbers. Validation of the applicable computational method is achieved by comparing it to two previous studies. Significant findings from numerical simulations indicate that the highest velocity profile is in the centre of the channel (2.3–2.68 m/s at an inflow velocity of 1.5 m/s), while the lowest profile is observed along the channel wall, with a notable disruption near the inlet caused by increased shear forces. The cavity neck temperature ranges from 380 to 640 K, with inflow air velocities varying from 0.1 to 1.5 m/s (Re is 812 to 12,182), respectively. In addition, the pressure fluctuates at the channel-cavity junction, decreasing steadily along the channel length and reaching a maximum at the intake, where the cavity neck pressure varies from 0.01 to 2.5 Pa with inflow air velocities changing from 0.1 to 1.5 m/s, respectively. The mean Nusselt number exhibits an upward trend as air velocity upon entry increases. The mean Nusselt number reaches up to 1500 when the entry air velocity reaches 1.5 m/s. Due to recirculation patterns, the presence of the 90° unheated baffle produces a remarkable cooling effect. The study establishes a direct correlation between input air velocity and internal temperature distribution, indicating that as air velocity increases, heat dissipation improves. This research advances our understanding of convective heat transfer phenomena in complex geometries and provides insights for optimising thermal management strategies for a variety of engineering applications.

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Numerical Study of Convection Air Currents Around a Hot Cylinder Inside a Triangular Cavity

Cited by 2 publications

References 12 publications

Enhanced thermal performance and entropy generation analysis in a novel cavity design with circular cylinder

Enhanced thermal performance and entropy generation analysis in a novel cavity design with circular cylinder

Heat Convection in a Channel-Opened Cavity with Two Heated Sources and Baffle

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