In a Vented Square Enclosure, the Effect of a Flexible Baffle Attached to a Solid Cylinder on Mixed Convection

Hamzah, Hameed K.; Al-Amir, Qusay Rasheed; Abdulkadhim, Ammar; Ahmed, Saba Y.; Ali, Farooq H.; Abed, Azher M.; Abed, Isam Megbel

doi:10.1007/s13369-022-06595-x

Cited by 5 publications

(3 citation statements)

References 33 publications

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“…Results indicate that the baffles spread the flow inside the cavity and produce several circulation cells, which improve heat transfer. In a vented square enclosure with vertical walls that are differentially heated and an elastic baffle connected to a circular rod, Hamzeh et al 10 concentrate on the transient mixed convection. According to the research findings, it was evident that the comparison of the average Nusselt number in cavities with flexible baffles, rigid baffles, and no baffles showed that the cavity with the flexible baffle had the highest value.…”

Section: Introductionmentioning

confidence: 99%

Multigrid simulations of non-Newtonian fluid flow and heat transfer in a ventilated square cavity with mixed convection and baffles

Rehman,

Mahmood,

Majeed

et al. 2024

Sci Rep

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The impact of baffles on a convective heat transfer of a non-Newtonian fluid is experimentally studied within a square cavity. The non-Newtonian fluid is pumped into the cavity through the inlet and subsequently departs from the cavity via the outlet. Given the inherent non-linearity of the model, a numerical technique has been selected as the method for obtaining the outcomes. Primarily, the governing equations within the two-dimensional domain have been discretized using the finite element method. For approximating velocity and pressure, we have employed the reliable $${\mathbb{P}}_{2}$$ P 2 –$${\mathbb{P}}_{1}$$ P 1 finite element pair, while for temperature, we have opted for the quadratic basis. To enhance convergence speed and accuracy, we employ the powerful multigrid approach. This study investigates how key parameters like Richardson number (Ri), Reynolds number (Re), and baffle gap $${{\text{b}}}_{{\text{g}}}$$ b g influence heat transfer within a cavity comprising a non-Newtonian fluid. The baffle gap ($${b}_{g}$$ b g ) has been systematically altered within the range of 0.2–0.6, and for this research, three distinct power law indices have been selected namely: 0.5, 1.0, and 1.5. The primary outcomes of the investigation are illustrated through velocity profiles, streamlines, and isotherm visualizations. Furthermore, the study includes the computation of the $${Nu}_{avg}$$ Nu avg (average Nusselt number) across a range of parameter values. As the Richardson number (Ri) increases, $${Nu}_{avg}$$ Nu avg also rises, indicating that an increase in Ri results in augmented average heat transfer. Making the space between the baffles wider makes heat flow more intense. This, in turn, heats up more fluid within the cavity.

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Section: Introductionmentioning

confidence: 99%

Multigrid simulations of non-Newtonian fluid flow and heat transfer in a ventilated square cavity with mixed convection and baffles

Rehman,

Mahmood,

Majeed

et al. 2024

Sci Rep

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“…Selimefendigil and Oztop (2019) studied a ventilated cavity with an angled magnetic field, discovering varying magnetic fields and inclination angles affecting heat transfer. Hamzah et al (2022) studied a ventilated square cavity with a solid cylinder and a flexible baffle, noting increased heat transmission with the flexible baffle. Chatterjee et al (2022) explored nanofluidic magneto-thermal convection in a triangular enclosure with a central hot obstacle of an inverted triangular shape.…”

Section: Introductionmentioning

confidence: 99%

Effects of heater positions on magneto-hydrodynamic convection of CuO-water nanofluid flow in a grooved channel

Rahaman,

Biswas,

Santra

et al. 2024

HFF

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Purpose This study aims to delve into the coupled mixed convective heat transport process within a grooved channel cavity using CuO-water nanofluid and an inclined magnetic field. The cavity undergoes isothermal heating from the bottom, with variations in the positions of heated walls across the grooved channel. The aim is to assess the impact of heater positions on thermal performance and identify the most effective configuration. Design/methodology/approach Numerical solutions to the evolved transport equations are obtained using a finite volume method-based indigenous solver. The dimensionless parameters of Reynolds number (1 ≤ Re ≤ 500), Richardson number (0.1 ≤ Ri ≤ 100), Hartmann number (0 ≤ Ha ≤ 70) and magnetic field inclination angle (0° ≤ γ ≤ 180°) are considered. The solved variables generate both local and global variables after discretization using the semi-implicit method for pressure linked equations algorithm on nonuniform grids. Findings The study reveals that optimal heat transfer occurs when the heater is positioned at the right corner of the grooved cavity. Heat transfer augmentation ranges from 0.5% to 168.53% for Re = 50 to 300 compared to the bottom-heated case. The magnetic field’s orientation significantly influences the average heat transfer, initially rising and then declining with increasing inclination angle. Overall, this analysis underscores the effectiveness of heater positions in achieving superior thermal performance in a grooved channel cavity. Research limitations/implications This concept can be extended to explore enhanced thermal performance under various thermal boundary conditions, considering wall curvature effects, different geometry orientations and the presence of porous structures, either numerically or experimentally. Practical implications The findings are applicable across diverse fields, including biomedical systems, heat exchanging devices, electronic cooling systems, food processing, drying processes, crystallization, mixing processes and beyond. Originality/value This work provides a novel exploration of CuO-water nanofluid flow in mixed convection within a grooved channel cavity under the influence of an inclined magnetic field. The influence of different heater positions on thermomagnetic convection in such a cavity has not been extensively investigated before, contributing to the originality and value of this research.

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“…The results showed that oscillation of the fins increased the heat transfer rate. Hamzah et al [24] focused on the study of mixed convection in a square enclosure with an elastic baffle connected to the solid cylinder. The result showed that the average Nusselt number increased by 59% at Ri=200 with a flexible baffle compared with a rigid baffle.…”

Section: Introductionmentioning

confidence: 99%

Effect of Deformable Baffle on the Forced Convection of Nanofluid Flow in Corrugated Channels

Harbood,

Hamzah,

Obied

2023

IJHT

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The current work aims to study the heat transfer numerically in a complex channel that contains a trapezoid hanging in the channel. This channel subject to forced convective, two-dimensional and incompressible flows. For the geometrical investigation, the numerical simulations were performed for constant Prandtl number (Pr=6.9), Volume fraction (φ) equal to (0.02-0.04), Cauchy number (Ca) equal to (10 -4 -10 -8 ) and Reynolds number equal to (60-160). The baffle elasticity is fixed at three positions: the first position near the inlet of the channel is called (case A), the second position at the center of the channel is called (case B) and the last at near outlet of the channel is called (case C). The length of baffle is investigated at 1.5cm. The trouble was solved using finite element method with Arbitrary Lagrangian-Eulerian (ALE) technique. Results demonstrated that, the improvement of heat transfer is recorded with baffle about 10% compared without baffle. The complex channel with ratio L1/H1=3 and B1/H1=0.8 increases the heat transfer rate about 42% compared to the worst case at B1/H1=0 and L1/H1=0 at Re=60. The average Nusselt number follows a higher value for Ca=1e-4. The (case A) was accorded the high Nusselt number about 52% at Re=160 compared with second and third location.

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In a Vented Square Enclosure, the Effect of a Flexible Baffle Attached to a Solid Cylinder on Mixed Convection

Cited by 5 publications

References 33 publications

Multigrid simulations of non-Newtonian fluid flow and heat transfer in a ventilated square cavity with mixed convection and baffles

Multigrid simulations of non-Newtonian fluid flow and heat transfer in a ventilated square cavity with mixed convection and baffles

Effects of heater positions on magneto-hydrodynamic convection of CuO-water nanofluid flow in a grooved channel

Effect of Deformable Baffle on the Forced Convection of Nanofluid Flow in Corrugated Channels

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