Numerical Study of Transient and Steady-State Natural Convection and Surface Thermal Radiation in a Horizontal Square Open Cavity

Hinojosa, J.; Estrada, Claudio A.; Cabanillas, R.E.; Álvarez, G.

doi:10.1080/10407780590948936

Cited by 62 publications

(16 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They observed that cavity receiver inclination angle significantly influences the convective Nusselt number and not the radiation Nusselt number. Hinojosa et al [16] used the Boussinesq approximation in the numerical study of natural convection and surface thermal radiation in an open cavity. Reddy and Sendhil Kumar [17] reported numerical results of natural convection and radiation heat transfer in a modified cavity receiver.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional analysis and numerical optimization of combined natural convection and radiation heat loss in solar cavity receiver with plate fins insert

Ngo

Bello‐Ochende

Meyer

2015

Energy Conversion and Management

View full text Add to dashboard Cite

The numerical study and optimization of combined laminar natural convection and surface radiation heat transfer in solar cavity receiver with plate fins is presented in this paper. Minimizing heat loss in cavity receivers is seen as an effective way to enhance the thermal performance and the use of plate fins has been proposed as a low cost means to minimize heat loss. Firstly, the influence of operating temperature, emissivity of the surface, orientation and the geometric parameters on the total heat loss from the receiver was investigated. It was observed that convective heat loss is largely affected by the angle of inclination of the receiver, the presence of fins and the number of fins in the receiver. As for the radiation heat loss it was observed that it is mainly influenced by the properties of the cavity receiver surface. The radiation heat loss was found to be constant at all the angles of the receiver. Significant reduction in natural convection heat loss from the cavity receiver was accomplished by using the plate fins whereas radiation heat loss was marginally reduced by about 5%. Secondly, the optimization was conducted to obtain the optimal fin geometry and lastly, the overall thermal efficiency of the receiver was presented at different operating temperatures. The overall cavity efficiency marginally increased by approximately 2% with the insertion of fin plates although the convective heat loss was suppressed by about 20%. This is due to the fact that radiation heat loss dominates at high operating temperatures compared to convective heat loss.

show abstract

Section: Introductionmentioning

confidence: 99%

Three-dimensional analysis and numerical optimization of combined natural convection and radiation heat loss in solar cavity receiver with plate fins insert

Ngo

Bello‐Ochende

Meyer

2015

Energy Conversion and Management

View full text Add to dashboard Cite

show abstract

“…To further validate the present numerical code, natural convection in square open cavities has been numerically analyzed. One of the initial numerical studies on single component natural convection in an open enclosure was performed by Chan and Tien [11,12]; Angirasa et al [13]; Hinojosa et al [16]. For this comparison, solutions presented in Table 1 are obtained for Ra = 10 3 -10 7 , Pr = 1.0 in a square cavity where the vertical wall facing to the opening is maintained at uniform and higher temperature, while the horizontal walls are adiabatic.…”

Section: Numerical Technique and Code Validationmentioning

confidence: 98%

“…The solution of elliptic partial differential equations of natural convection flow in open cavities is found to be highly sensitive to the boundary conditions at the entry and exit [11][12][13][14][15][16][17]. In the present work, the derivative of tangential velocity is set at zero and the longitudinal velocity is obtained by the mass balance at the boundary cells [12].…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…Thinking essentially of actual engineering applications, such as food and grain storage, building construction elements, internal fluid motion could interact with ambient environment through openings or infiltrations, i.e., partial enclosures. In past decades, single component natural convection in partial enclosures has been investigated broadly, including inclination, port size, heating boundary conditions, fluid properties, coupling with radiation, etc [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Combined heat and moisture convective transport in a partial enclosure with multiple free ports

Tang¹,

Liu²,

Zhao³

et al. 2010

Applied Thermal Engineering

View full text Add to dashboard Cite

a b s t r a c tCombined heat and moisture transport in an enclosure with free ports has been investigated numerically. Enclosed moist air interacts with the surrounding air through these free-vented ports. The governing conservation equations were solved numerically using a control volume-based finite difference technique. Appropriate velocity boundary conditions at each ports are imposed to achieve overall mass conservation across this system. Air, heat and moisture transport structures are visualized respectively by streamlines, heatlines and masslines. Effects of buoyancy ratio, thermal Rayleigh number on convective heat/moisture transfer rate and flow rate across each free-vented port are discussed. Particularly, Numerical results demonstrate that the convective heat and moisture transport patterns and transport rates on horizontal ports greatly depend on properties of porous medium, while the air exchange rate on vertical port is almost unaffected by the buoyancy ratios for most situations.

show abstract

“…Foregoing equations are emerging the dimensionless parameters: (9) where, Le represents the ratio between the thermal and compositional diffusivities. For liquid solutions, thermal diffusivity is considerably higher than mass diffusivity, and this is one of the causes of many remarkable patterns of these flows, like convective cells separated by sharp interfaces [13,14].…”

Section: Governing Equationsmentioning

confidence: 99%

Passive heat and moisture removal from a natural vented enclosure with a massive wall

Liu¹,

Zhao²,

Wang³

2011

Energy

View full text Add to dashboard Cite

Numerical Study of Transient and Steady-State Natural Convection and Surface Thermal Radiation in a Horizontal Square Open Cavity

Cited by 62 publications

References 16 publications

Three-dimensional analysis and numerical optimization of combined natural convection and radiation heat loss in solar cavity receiver with plate fins insert

Three-dimensional analysis and numerical optimization of combined natural convection and radiation heat loss in solar cavity receiver with plate fins insert

Combined heat and moisture convective transport in a partial enclosure with multiple free ports

Passive heat and moisture removal from a natural vented enclosure with a massive wall

Contact Info

Product

Resources

About