Numerical study of natural convection loss from open cavities

Prakash, Mahesh; Kedare, Shireesh B.; Nayak, J.K.

doi:10.1016/j.ijthermalsci.2011.08.012

Cited by 77 publications

(30 citation statements)

References 29 publications

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“…The numerical model predicted flow instabilities and Nusselt number oscillations for Rayleigh number values of 10 6 and 10 7 . Prakash et al [37] investigated numerically the natural convection from open cavities of three different shapes (cubical, spherical and hemispherical) having equal heat transfer area using commercial CFD software Fluent. The study was performed using wall temperatures of 100, 200 and 300 °C.…”

Section: Three-dimensional Numerical Studiesmentioning

confidence: 99%

Experimental and numerical study of turbulent natural convection in an open cubic cavity

2015

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k Turbulent kinetic energy (J/kg) L Cavity wall length (m) Nu Local convective Nusselt number nondimensional Nu Total average Nusselt number nondimensional P k Generation of turbulent kinetic energy (J/kg) q″ Heat flux (W/m 2 ) Ra Rayleigh number = gβq″L 4 /ανλ, nondimensional T h Average temperature of the hot wall (K) T ∞ Ambient temperature (K) V Voltage (V) X, Y, Z Coordinate system (m) Greek symbols α Thermal diffusivity (m 2 /s) β Thermal expansion coefficient (1/K) ε t Turbulent kinetic energy dissipation (J/kg) λ Thermal conductivity (W/m K) µ t Turbulent viscosity (kg/m s) ν Kinematic viscosity (m 2 /s) ρ Density (kg/m 3 ) σ t Turbulent Prandtl number nondimensional

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Section: Three-dimensional Numerical Studiesmentioning

confidence: 99%

Experimental and numerical study of turbulent natural convection in an open cubic cavity

2015

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“…The study shows that the thickness of the hydrodynamic boundary layer in the vicinity of the hot wall increases as ε (dimensionless temperature difference) increases from 0.03 to 1.6. Nayak et al [15] have numerically analyzed natural convection in open cavities of three different geometries viz. cubical, spherical and hemispherical.…”

Section: Literature Reviewmentioning

confidence: 99%

Numerical Investigation of Mixed Convection Heat Transfer from Block Mounted on a Cavity

et al. 2014

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This work aims to numerically investigate the mixed convective flow over a three-dimensional cavity that lies under the horizontal channel with a vertical heat source projecting from the bottom of the cavity. This investigation is progressed by establishing the boundary conditions of the walls of vertical heat source as isothermal, while backward and the forward facing steps as isothermal at ambient temperatures and the rest of the walls are adiabatic. The flow is laminar and incompressible in the cubic geometry. A numerical simulation is undertaken to investigate the flow structure, heat transfer characteristics and the complex interaction between the induced stream flow at ambient temperature and buoyancy-induced flow from the walls of the heated source. The numerical simulations are performed using commercial CFD codes. The numerical codes are validated with previously published benchmark results. The study is performed for three different Reynolds numbers (100, 500 and 1,000) and subsequently for three different Richardson numbers (0.1, 1 and 10) for each Reynolds number. The height of the vertical heat source is kept constant for all the abovementioned cases. A special case is undertaken to study the

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“…Bilgen and Öztop [1] solved via a finite volume method the two-dimensional governing equations of 2D natural convection in partially open inclined cavities. Prakash et al [2] studied different heat transfer areas using Fluent. A buoyancy-induced flow loss is observed to increase with increasing opening ratio.…”

Section: Introductionmentioning

confidence: 99%

3D Buoyancy-Induced Flow and Entropy Generation of Nanofluid-Filled Open Cavities Having Adiabatic Diamond Shaped Obstacles

Kolsi

Mahian

Öztop

et al. 2016

Entropy

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A three dimensional computational solution has been obtained to investigate the natural convection and entropy generation of nanofluid-filled open cavities with an adiabatic diamond shaped obstacle. In the model, the finite volume technique was used to solve the governing equations. Based on the configuration, the cavity is heated from the left vertical wall and the diamond shape was chosen as adiabatic. Effects of nanoparticle volume fraction, Rayleigh number (10 3 ď Ra ď 10 6 ) and width of diamond shape were studied as governing parameters. It was found that the geometry of the partition is a control parameter for heat and fluid flow inside the open enclosure.

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Numerical study of natural convection loss from open cavities

Cited by 77 publications

References 29 publications

Experimental and numerical study of turbulent natural convection in an open cubic cavity

Experimental and numerical study of turbulent natural convection in an open cubic cavity

Numerical Investigation of Mixed Convection Heat Transfer from Block Mounted on a Cavity

3D Buoyancy-Induced Flow and Entropy Generation of Nanofluid-Filled Open Cavities Having Adiabatic Diamond Shaped Obstacles

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