Effect Of Gas Additives On The Surface Tension And The Boiling Temperature Of LiBr Aqueous Solution Added Nano-particles

The gas solubility in the salt solution is mainly discussed in this paper. The influence of gas additives on the surface tension and the boiling temperature of nanometer lithium bromide aqueous solution(nano-Li Br-H2O) were got by measuring the different concentrations of nanometer lithium bromide aqueous solution under different solubility. The coupling mechanism of the effect of additives with three phases(solid, liquid and gas) to the boiling temperature of the nano-Li Br-H2 O was explored to find additives that could reduce the boiling temperature of the generator of the lithium bromide units and to provide theoretical basis for it.There have been cases in the industry that adding a certain concentration of isooctyl alcohol(2EH) to strengthen the absorption efficiency of the refrigeration unit. And that the additive 2EH was used to do experiments was safe and convenient because of its characters of low toxicity, poorly soluble in water and stable chemical properties. But there is no exact research and theoretical analysis about its impact mechanism to the boiling heat transfer. Therefore, 2EH was chosen as the gas additive. The boiling temperature and the surface tension of the nano-Li Br-H2 O with the change of gas 2EH were measured changes of the solubility of gas 2EH.The study results show that: both the surface tension and boiling temperature of the Li Br-H2 O decreases by adding gas 2EH, and with the increasing of the concentration of the Li Br-H2 O, the change rate of the surface tension decreases, which could be explained by the mechanism of the dissolution of gas in salt solution. Under the joint action of gas 2EH and dispersant to increase the stability of the nanofluids, the surface tension of the nano-Li Br-H2 O decreases which leads that the boiling temperature is lower than that of the nano-Li Br-H2 O without adding gas 2EH, but because of the influence of the contact angle and roughness, the change rate of the boiling temperature is not the same with that of the surface tension. Finally, the phenomenon of adding additives in three phases into the Li Br-H2 O is explained from the angle of the surface tension, the roughness and the number of the cavity: the surface tension of the solution would be lower by adding additives in three phases, when the concentration of liquid 2EH is lower than 1.0%, and it would be almost the same with that of the solution by adding gas 2EH; the curve of the boiling temperature of the two cases coincide. And the combination mechanism of adding additives in three phases was got initially.