Mixed convection heat transfer simulation in a rectangular channel with a variable speed rotational cylinder

Khan, Imran; Billah, Md. Mamun; Rahman, Mohammed Mizanur; Hasan, Mohammad Nasim

doi:10.1063/1.5018566

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…Their research shows that within the forced convection region, rotating plates enhance heat transfer in enclosures more effectively than rotating cylinders. Further advancements and insights can be emphasized based on the research conducted by Khan et al, 11 which demonstrates that both the direction and speed of rotation significantly influence the formation of boundary layers, flow patterns, temperature distribution, and heat transfer characteristics. Elevated speed ratios lead to increased heat transfer in cases of counterclockwise rotation, whereas reduced speed ratios enhance heat transfer in instances of clockwise rotation.…”

Section: Study On Heat Transfer Enhancement Employing Flow Modulatorsmentioning

confidence: 99%

Mixed convection characteristics in a long horizontal lid‐driven channel with periodically distributed local flow modulators

Nahin,

Qaum,

Chowdhury

et al. 2024

Heat Trans

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This study explores the effectiveness of periodically placed rotating blades in enhancing heat transfer in a channel. The channel consists of a cold top plate moving at a constant speed and a fixed hot plate at the bottom. Thin rotating blades are placed periodically along the channel's centerline, with the spacing between their axes equal to the channel's height. This paper analyzes a transient, two‐dimensional, laminar flow problem using energy, momentum, and continuity equations. To address the challenges posed by moving blades, the Galerkin finite element method is implemented within an arbitrary Lagrangian–Eulerian framework, employing a triangular mesh discretization scheme. This study comprehensively explores thermal and hydrodynamic characteristics, including overall heat transfer, thermal frequency, and power consumption of the rotating blade for heat transfer in mixed convection scenarios with Richardson numbers (Ri) ranging from 0.1 to 10 at varying rotational frequency of the blade. Outcomes demonstrate that the inclusion of a rotating blade increases heat transfer up to 50% at lower Ri, after which the impact of the rotating blade diminishes and heat transfer reduces up to 20% at higher Ri. In addition, heat transfer enhances with increasing blade frequency up to Ri = 6.5, beyond which the effect of the frequency overturns. Examining thermal and hydrodynamic characteristics reveals that the blade achieves optimal performance when operating at f = 1 and Ri = 3. The study's insights into mixed convection heat transfer offer versatile applications, benefiting industries and equipment such as electronic cooling, chemical reactors, food processing, material fabrication, solar collectors, and nuclear reactor systems. Moreover, the findings are instrumental in the thermal ventilation of buildings and the development of micro‐electromechanical systems.

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Section: Study On Heat Transfer Enhancement Employing Flow Modulatorsmentioning

confidence: 99%

Mixed convection characteristics in a long horizontal lid‐driven channel with periodically distributed local flow modulators

Nahin,

Qaum,

Chowdhury

et al. 2024

Heat Trans

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“…The viscosity of the Cu‐water nanofluid is described by using the Brinkman model. This model explains the relation between the dynamic viscosity of nanofluid and base fluid, which has been used by many researchers 2,3,5,12,16,27,34,48,51,52

μ_{na} = \frac{μ_{bf}}{{false(1 - φ false)}^{2.5}} .

…”

Section: Geometry Description and The Mathematical Modelmentioning

confidence: 99%

“…Some examples of these applications are as follows: the float glass production, cooling of electronic equipments, lubrication technologies, manufacturing and food processes, cooling of nuclear reactors, and many others. Khan 2 and Esfe et al 3 introduced a simulation and validation method of coefficient heat transfer and pressure drop by artificial neural network (ANN) of functionalized aqueous COOH multiwalled carbon nanotube (MWCNT) nanofluids, proposing a new connection. The volume fraction and the Reynolds number and heat transfer coefficient and pressure drop considered as ANN outputs have been included in the current experiment with the ANN input results.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that there was a decrease in the average Nusselt number with an increase in the rotational speed of the cylinder. A cylinder with a periodic angular velocity, which was considered fixed across the airflow inside a rectangular channel, was simulated numerically by Khan et al 2 Their efforts were devoted to explain the mixed convection heat transfer phenomenon inside this channel. It was observed that both streamlines and isotherms were significantly affected by the cylinder's rotational speed and the direction of the rotation.…”

Section: Introductionmentioning

confidence: 99%

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Mixed convection of nanofluid in a square enclosure with a hot bottom wall and a conductive half‐immersed rotating circular cylinder

et al. 2020

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In this study. The mixed convection in a square enclosure with a hot bottom wall and a conductive half-immersed rotating cylinder from its top wall is investigated numerically. The enclosure is filled with a copper-water nanofluid. The upper half of the cylinder is cooled by the surrounding air, whereas its solid lower half is exposed to the nanofluid. The two left and right sidewalls of the enclosure, together with

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“…Therefore, analyzing steam CHT of PCCS in the presence of NCG was essential. CFD and related simulation tools were widely used in fluid flow, heat transfer, and biomaterial applications (Khan et al, 2017;Ahammad et al, 2019;Saha et al, 2020;Hasan et al, 2021). Additionally, CFD and related simulation tools were commonly used in various nuclear reactor applications (Mahaffy et al, 2007;Shamim et al, 2016;Sharma et al, 2019;Ahmed, 2021aAhmed, , 2021bBhowmik and Suh, 2021).…”

Section: Introductionmentioning

confidence: 99%

CFD validation of condensation heat transfer in scaled-down small modular reactor applications, Part 2: Steam and non-condensable gas

Bhowmik

Schlegel

Kalra

et al. 2021

Exp. Comput. Multiph. Flow

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This paper presents the computational fluid dynamics (CFD) validation and scaling assessment of the condensation heat transfer (CHT) models in the presence of non-condensable gas for the passive containment cooling system (PCCS) of the small modular reactor (SMR). The STAR-CCM+ software with 3D scaled-down SMR containment geometries was used in CFD simulations with steam and non-condensable gas (NCG). The limitations and approximations of the previous studies were resolved to avoid scaling distortion and uncertainties. Air was used as the NCG gas with steam. The multi-component gas model was used to define the steam-NCG mixture, and the condensation-seed parameter was used as the source term for the fluid film model. Three different turbulence models were used to check the heat flux performances and temperature distributions on the coolant side. The heat flux was estimated from the axial coolant bulk temperature, which was identical to the test data reduction method. An implicit-unsteady numerical solver was applied to the conjugate heat transfer models between the gas, liquid, and solid regions. Detailed simulations were performed, and simulation results were validated with the measured parameters experimentally. The condensation heat transfer performance was quantified using non-dimensional numbers and compared for different scaled geometries to identify the scaling distortions.

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Mixed convection heat transfer simulation in a rectangular channel with a variable speed rotational cylinder

Cited by 4 publications

References 6 publications

Mixed convection characteristics in a long horizontal lid‐driven channel with periodically distributed local flow modulators

Mixed convection characteristics in a long horizontal lid‐driven channel with periodically distributed local flow modulators

Mixed convection of nanofluid in a square enclosure with a hot bottom wall and a conductive half‐immersed rotating circular cylinder

CFD validation of condensation heat transfer in scaled-down small modular reactor applications, Part 2: Steam and non-condensable gas

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