The influence of radiation absorption on solar pond stability

Giestas, Margarida Canedo; Pina, H.; Joyce, António

doi:10.1016/0017-9310(96)00052-x

Cited by 32 publications

(22 citation statements)

References 10 publications

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“…Kaushika et al [1] and Bansal et al [2] solved the one-dimensional equation of heat conduction with fluid internal heating due to solar radiation absorption. Giestas et al [3] analysed the stability of the gradient zone of a solar pond taking into account solar radiation absorption. Kurt et al [4] studied the performance of an uninsulated solar pond by developing one-dimensional transient heat conduction with internal heating of fluid.…”

Section: Introductionmentioning

confidence: 99%

A Two-Dimensional Numerical Study of Hydrodynamic, Heat and Mass Transfer and Stability in a Salt Gradient Solar Pond

2012

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Abstract:In this work, the problem of hydrodynamic, heat and mass transfer and stability in a salt gradient solar pond has been numerically studied by means of computational fluid dynamics in transient regime. The body of the simulated pond is an enclosure of height H and length L wherein an artificial salinity gradient is created in order to suppress convective motions induced by solar radiation absorption and to stabilize the solar pond during the period of operation. Here we show the distribution of velocity, temperature and salt concentration fields during energy collection and storage in a solar pond filled with water and constituted by three different salinity zones. The bottom of the pond is blackened and the free-surface is subjected to heat losses by convection, evaporation and radiation while the vertical walls are adiabatic and impermeable. The governing equations of continuity, momentum, thermal energy and mass transfer are discretized by finite-volume method in transient regime. Velocity vector fields show the presence of thin convective cells in the upper convective zone (UCZ) and large convective cells in the lower convective zone (LCZ). This study shows the importance of buoyancy ratio in the decrease of temperature in the UCZ and in the preservation of high temperature in the LCZ. It shows also the importance of the thickness of Non-Convective Zone (NCZ) in the reduction of the upwards heat losses.

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Section: Introductionmentioning

confidence: 99%

A Two-Dimensional Numerical Study of Hydrodynamic, Heat and Mass Transfer and Stability in a Salt Gradient Solar Pond

2012

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“…Taking physically realistic values [7,9,16], the parameters, unless stated otherwise, are fixed atd = 0.7, H d = 150, Q = 4, µ f = 0.2, µ m = 5, ǫ T = 0.7, f = 0.5 and R 2 S = 10000. Figure 4 shows the effect of Q on the stability of the solar pond by giving (a) the neutral curves at representative parameter values and (b) the corresponding temperature in the LCZ, T LCZ , (i.e.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…at z = d). The extinction coefficient β f takes into account the transparency of the medium, for example see [7,16]. The governing equations in the porous layer are given by Darcy's equation (see [20,25]), the incompressibility condition and the balance of energy and solute, namely…”

Section: Formation Of the Problemmentioning

confidence: 99%

“…where T 0 is the external temperature and h d is the natural convection heat transfer coefficient [7,16]. The term involving heat flux reflects the fact that the heat flux from the GZ must be equal to the heat transferred to the surface by convection.…”

Section: Formation Of the Problemmentioning

confidence: 99%

“…T m (−d m )) for a specific physical system. The physical parameters are taken to be T 0 = 20 [7,16]. The combined fluid/porous depth of the layer is taken to be 1m, which corresponds to d + d m = 1.…”

Section: Formation Of the Problemmentioning

confidence: 99%

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The influence of a fluid-porous interface on solar pond stability

Hill

Carr

2013

Advances in Water Resources

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The linear instability of the gradient zone of a solar pond containing a fluidporous interface is investigated. It is found that the gradient zone can retain the same stability for lower values of the solute Rayleigh number with the introduction of a porous material compared with a purely fluid layer, whilst maintaining the same lower convective zone temperature.Interestingly, it is also shown that for certain parameter values the penetration of a porous medium into the gradient zone can cause the temperature of the lower convective zone to rise. However, for certain parameter ranges, when the fluid-porous interface is towards the top of the gradient zone, the solar pond can become highly unstable.

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