Experimental study of a double-diffusive two-layer system in a laterally heated enclosure

Tanny, Josef; Yakubov, Bachtiyar

doi:10.1016/s0017-9310(99)00036-8

“…Tanny and Yakubov [23] investigated the mixing process of a double-diffusive two-layer system in a laterally heated enclosure. They found that for the lateral heating enclosure, a circulating flow was induced in each layer such that the interface separating the layers was simultaneously exposed to destabilizing the shear and double diffusive convection.…”

Section: Onset Of Thermo-solutal Convection With So Ret Effectmentioning

confidence: 99%

Thermo-solutal convection with Soret effect

Rahman¹

2021

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In the present study, the onset of thermal convection in a liquid layer overlying a porous layer where the whole system is being laterally heated is investigated. The non-linear two-dimensional Navier Stokes equations, the energy equation, the mass balance equation and the continuity equation are solved for the liquid layer. Instead of the Navier Stokes equations, the Brinkman model is used for the porous layer. The partial differential equations are solved numerically using the finite element technique. A two-dimensional geometrical model with lateral heating is considered. Two different cases are analyzed in this thesis. In the first case, the gravity driven buoyancy convection and the Marangoni convection are studied. For the Marangoni convection, the microgravity condition is considered and the surface tension is assumed to vary linearly with temperature. Different aspect ratios, as well as thickness ratios, are studies in detail for both the buoyancy and the Marangoni convection. Results revealed that for both the buoyancy and the Marangoni cases, flow penetrates into the porous layer, only when the thickness ratio is more than 0.90. In the case of thermo-solutal convection in the presence of Soret effect, it has been found that the isopropanol component goes either towards the hot or the cold walls depending on the fluid mixtures which has been used in the system.

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“…Tanny and Yakubov [23] investigated the mixing process of a double-diffusive two-layer system in a laterally heated enclosure. They found that for the lateral heating enclosure, a circulating flow was induced in each layer such that the interface separating the layers was simultaneously exposed to destabilizing the shear and double diffusive convection.…”

Section: Onset Of Thermo-solutal Convection With So Ret Effectmentioning

confidence: 99%

Thermo-solutal convection with Soret effect

Rahman¹

2021

Preprint

0

View full text Add to dashboard Cite

In the present study, the onset of thermal convection in a liquid layer overlying a porous layer where the whole system is being laterally heated is investigated. The non-linear two-dimensional Navier Stokes equations, the energy equation, the mass balance equation and the continuity equation are solved for the liquid layer. Instead of the Navier Stokes equations, the Brinkman model is used for the porous layer. The partial differential equations are solved numerically using the finite element technique. A two-dimensional geometrical model with lateral heating is considered. Two different cases are analyzed in this thesis. In the first case, the gravity driven buoyancy convection and the Marangoni convection are studied. For the Marangoni convection, the microgravity condition is considered and the surface tension is assumed to vary linearly with temperature. Different aspect ratios, as well as thickness ratios, are studies in detail for both the buoyancy and the Marangoni convection. Results revealed that for both the buoyancy and the Marangoni cases, flow penetrates into the porous layer, only when the thickness ratio is more than 0.90. In the case of thermo-solutal convection in the presence of Soret effect, it has been found that the isopropanol component goes either towards the hot or the cold walls depending on the fluid mixtures which has been used in the system.

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“…Analysis of the conventional environmental control treatments within the greenhouse can help to determine how to advance the production process. Traditional systems include natural or forced ventilation during the day and heating at night with fan heater pipes or heated sleeves, evaporative cooling systems (known as fan and pad cooling), and active dehumidification systems [1][2][3][4][5][6][7][8]. However, contemporary systems are very energy-intensive, reducing cost-effectiveness and increasing the amount of environmental pollution.…”

Section: Introductionmentioning

confidence: 99%