Non-isothermal desorption and nucleate boiling in a water-salt droplet LiBr

Abstract

Experimental data on desorption and nucleate boiling in a droplet of LiBr-water solution were obtained. An increase in salt concentration in a liquid-layer leads to a considerable decrease in the rate of desorption. The significant decrease in desorption intensity with a rise of initial mass concentration of salt has been observed. Evaporation rate of distillate droplet is constant for a long time period. At nucleate boiling of a water-salt solution of droplet several characteristic regimes occur: heating, nucleate boiling, desorption without bubble formation, formation of the solid, thin crystalline-hydrate film on the upper droplet surface, and formation of the ordered crystalline-hydrate structures during the longer time periods. For the final stage of desorption there is a big difference in desorption rate for initial salt concentration, C 0 , 11% and 51%. This great difference in the rate of desorption is associated with significantly more thin solution film for C 0 = 11% and higher heat flux.

Explosive disintegration of two-component droplets in a gas flow at its turbulization

“…The obtained experimental results are important for fundamental research in the field of non-contact temperature measurements of droplets of solutions, emulsions and suspensions under radiation, and convective and conductive heating. In particular, it is emphasized in [14][15][16][17][18][19][20][21][22][23] that reliable experimental information on essentially non-stationary and non-uniform temperature fields of evaporating droplets is not sufficient. The lack of a reliable experimental database on such temperature fields still hinders the development of models of heating and evaporation of fuel droplets.…”

Numerical study on heat and mass transfer behavior of pool boiling in LiBr/H2O absorption chiller generator considering different tube surfaces

“…Several studies have been carried out to examine the pool boiling effects in different engineering areas. These studies have focused on the horizontal falling film absorber [9,10], the boiling heat transfer coefficient in mechanical refrigeration systems [11], the desorption and nucleate boiling in a droplet of LiBr/H 2 O solution to check how an increase in the salt concentration of a liquid-layer may lead to a significant decrease in the rate of desorption [12,13], and the process of stationary evaporation of aqueous solutions [14,15]. Concerning previous literature, the pool boiling process in the absorption chiller generator might be enhanced by improving the useful parameters, causing an increase in the COP of the chiller.…”