An experimental investigation of thermo-capillary convection in solution of lithium bromide at non-isothermal absorption

Bufetov, N. S.; Dekhtyar, R. A.; Ovchinikov, V. V.

doi:10.21443/1560-9278-2016-3-673-679

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…The use of liquid films in absorbers, condensers, and heat exchangers makes the studies of film flow structure and effect of this structure on local and average heat and mass transfer characteristics relevant [1][2][3][4][5][6][7][8][9]. Intensification of heat and mass transfer processes occurs both because of an increase in the film area and due to a change in the velocity profile in the film [10,11].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effect of a gap between the cylindrical substrate and curvilinear ring on the regimes of liquid film flow

2017

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Abstract. Experimental studies have been carried out to reveal the peculiarities of the influence of the arrangement of the curved ring on the flow regimes of a liquid film along a cylindrical surface. Regimes under which the estimated thickness of the gap between the flowing film and the cylinder may not be sufficient. Recommendations are given to determine the minimum value of the distance between the ring and the surface along which the film flows, so that at any flow of liquid there is no contact between the liquid and the ring.

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Section: Introductionmentioning

confidence: 99%

Investigation of the effect of a gap between the cylindrical substrate and curvilinear ring on the regimes of liquid film flow

2017

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Study of non-isothermal absorption and thermo-capillary convection in lithium bromide solution with a variable absorbent depth

Slesareva

Bufetov

Dekhtyar

2019

International Youth Scientific Conference “Heat and Mass Transfer in the Thermal Control System of Technical and Technological

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The effect of small perturbation on dynamics of absorptive LiBr–water solution

Arroiabe,

Martinez-Agirre,

Nepomnyashchy

et al. 2024

Physics of Fluids

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In a binary solution of lithium bromide–water, even a small disturbance in the initial homogeneous mass fraction at the absorbing interface has profound effects on the entire system dynamics. This perturbation of absorption disrupts the equilibrium, leading to the formation of surface tension gradients and subsequently, Marangoni flows. While these flows are relatively weak, they result in a non-uniform distribution of density within the bulk, initiating buoyant convection. We investigate complexities of the Marangoni, solutal, and buoyant convection caused by localized disruptions in uniform absorption, all in the absence of any surfactants. We have conducted numerical simulations to explore fluid dynamics and heat and mass transfer, revealing three different regimes. Initially, shortly after disturbance, variations in mass fraction and flow within the cell are primarily governed by the Marangoni force. After a finite period, the emergence of buoyant convection leads to the strong growth of velocity and significant changes in temperature and mass fraction. Finally, the destabilization of the boundary layer becomes so significant that the emission of plumes is observed. At later times, the parallel existence of two types of patterns takes on a spatially fixed form. The central part, occupied by bands (visible on space-time maps), exhibits minimal changes in time, while a periodic structure is established near the wall. This behavior can be characterized as a relaxation–oscillation mode of instability.

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An experimental investigation of thermo-capillary convection in solution of lithium bromide at non-isothermal absorption

Cited by 4 publications

References 2 publications

Investigation of the effect of a gap between the cylindrical substrate and curvilinear ring on the regimes of liquid film flow

Investigation of the effect of a gap between the cylindrical substrate and curvilinear ring on the regimes of liquid film flow

Study of non-isothermal absorption and thermo-capillary convection in lithium bromide solution with a variable absorbent depth

The effect of small perturbation on dynamics of absorptive LiBr–water solution

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