Abstract
This work is devoted the research for two (three)-phase flows of LiBr water solution in minichannels with different heat flux and wall thicknesses. Six flow patterns have been observed: a bubble flow, plug flow, laminar and oscillating laminar flow, mist flow, and flow locking. The physical solution properties and the equilibrium conditions change in time. The desorption rate depends not only on the heat flow and speed ratio of vapor to liquid, but also on the total area of the interface (liquid-vapor). The third phase (solid crystal hydrates) are formed under high heat fluxes and in the presence of boiling crisis. A variation in the wall thickness leads to a change in the desorption mode. With increasing wall thickness the boiling crisis is realized at higher heat fluxes.
Highlights
Heat and mass transfer and capillary hydrodynamics in minichannels are being increasingly used in practice [1]
Three-phase flows of LiBr water solution in minichannels with different heat flux and wall thicknesses have been studied in this work
The following desorption modes have been found with increasing heat flux on the wall (Fig. 1): 1) the bubble mode; 2) the plug mode; 3) the laminated mode; 4) the oscillating laminated mode; 5) the emulsion mode; 6) the flow choking mode with crystalline hydrate
Summary
Heat and mass transfer and capillary hydrodynamics in minichannels are being increasingly used in practice [1]. The challenge of mapping modes for iso-thermal flows in minichannels is basically solved. Maps modes for non-isothermal flows is facing great difficulties. The evaporation of droplets in the flow of the oncoming air investigated in [3]. The aqueous LiBr solution behavior discussed in [4,5,6,7]. Liquid evaporation was investigated in [8,9,10,11,12,13,14,15,16,17,18]. The explosive with a mixture of liquid nitrogen jet and water and fine droplets evaporation is represented in [19-20]. Three-phase flows of LiBr water solution in minichannels with different heat flux and wall thicknesses have been studied in this work
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