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To further explore the influence law of nanoparticles on the surface tension of stable nano-Lithium Bromide solution (LiBr), the effects of temperature, solution concentration, dispersant and nanoparticles on the surface tension were investigated by Wilhelmy plate method under atmospheric pressure. The results demonstrate that the surface tension ascends with the augmentation of solution concentration and the amount of nanoparticles, decreases with increasing temperature and the amount of dispersant. The surface tension of the solution decreases obviously after adding dispersant. However, there is an optimal value for the amount of dispersant, and the surface tension of solution tends to be gentle increased after exceeding the optimal value of the dispersant, which is 2 wt%. Continue to add nanoparticles, the solution surface tension increases slightly, however, it is still less than pure LiBr. For instance, when the solution temperature is 30 °C and the solution concentration is 50 wt%, the surface tension of nano-LiBr added with 0.01 wt% nanoparticles decreases by 26.20%. The surface tension of nano-LiBr is impacted by coupling of the dispersant and nanoparticles at the same temperature and solution concentration. A surface tension calculation model of nano-LiBr was fitted using experimental data, and the maximum error was 2.78%. • The surface tension of nano-LiBr was measured by Wilhelmy plate method under steady-state conditions. • The effects of temperature, solution concentration, dispersant and nanoparticles on surface tension are clarified. • Based on the experimental data, a semi empirical model of the surface tension of stable nano-LiBr was obtained. [ABSTRACT FROM AUTHOR] more...

The purposes of this study are to measure the saturated vapor pressure and the mass transfer rate of lithium bromide (LiBr) aqueous solution in the presence of 40 nm CuO nano-particles with the concentrations of 0.0, 0.01, 0.05, 0.1 and 0.12 wt%, and to research the effects of nano-particles, solution concentration and temperature on the saturated vapor pressure and the water vapor absorption rate. Experimental results demonstrate that nano-particle is the main factor affecting the saturated vapor pressure and the mass transfer rate. The saturated vapor pressure decreases with nano-particle mass fraction up to an optimum concentration (0.1 wt% in CuO nanofluids) while increases by increasing the concentration of nano-particle further, and the effective change ratio of saturated vapor pressure increases first and then decreases as mass fraction of nano-particle increases. The mass transfer rate is also initially increased with increasing nano-particle concentration and then emerges a slowly rising tendency. The effective absorption ratio is enhanced when the nano-particle concentration increases, and the value of maximum effective absorption ratio is obtained when the nano-particle concentration is 0.1%. The effective absorption ratio has the maximum values of 2.20 and 2.85 in 58% LiBr solution with nano-particle concentration of 0.05% and 0.1%, respectively. • The saturated vapor pressure and mass transfer characteristics of the nano-LiBr solution are measured by balanced kettles. • Various factors affecting the saturated vapor pressure and mass transfer rate of the LiBr solution are clarified. • The maximum effective absorption ratio is 2.20 and 2.85 in 58% LiBr solution added 0.05% and 0.1% nanoparticles. [ABSTRACT FROM AUTHOR] more...