Surface tension of lithium bromide aqueous solution/ammonia with additives and nano-particles

Abstract

In order to investigate the effect of additives and nano-particle on the surface tensions of lithium bromide (LiBr) aqueous solution/ammonia, many experiments were carried out based on Wilhelmy plate method. Firstly, the surface tension of LiBr aqueous solution with 1-octanol was measured and then the comparison between the measured results and previous experimental results was given to verify the measuring accuracy. Some new additives, such as cationic surfactants cetyltrimethyl ammonium chloride (CTAC), and cetyltrimethyl ammonium bromide (CTAB) were chosen in the experiments. The experimental results show that CTAC and CTAB can obviously reduce the surface tension of LiBr aqueous solution/ammonia. In addition, it is found that nano-particles cannot remarkably decrease the surface tension of LiBr aqueous solution/ammonia. However, the mixed addition of additives and nano-particles can remarkably affect the surface tension of LiBr aqueous solution/ammonia. That is to say, additives play more important role in reducing the surface tension of LiBr aqueous solution/ammonia. But nano-particles may enhance the heat transfer in the absorption refrigeration process.

Keywords

lithium bromide / ammonia / additives / nano-particles / surface tension

References

[1] YanQ-s, ShiW-x, TianC-qingRefrigeration technology used in air-conditioning (Third ed) [M], 2004BeijingChina Architecture & Industry Press25

[2] YuL-mingThe study of Marangoni effect on the gas-liquid mass transfer process [D], 2005Tianjin, ChinaTianjin University

[3] WangW-dei. Effect of surface tension on mass transfer process [J]. Chem Eng, 2004, 32(2): 14-17

[4] YaoW, BjurstromH, SetterwallF. Surface tension of lithium bromide with heat-transfer additives [J]. J Chen Eng Data, 1991, 36: 96-98

[5] KimK J, BermanN S. Surface tension of aqueous lithium bromide + 2-ethyl-hexanol [J]. J Chen Eng Data, 1994, 39: 122-124

[6] KimK J, JanuleV P. Dynamic surface tension of aqueous lithium bromide with 2-ethyl-hexanol [J]. Int Commun Heat Mass, 1994, 21(6): 839-848

[7] KulankaraS, HeroldK E. Surface tension of aqueous lithium bromide with heat/mass transfer enhancement additives [J]. Int J Refrig, 2002, 25: 383-389

[8] YuanZ, HeroldK E. Surface tension of pure water and aqueous lithium bromide with 2-ethyl-hexanol [J]. Appl Therm Eng, 2001, 21: 881-897

[9] ChengW-l, ChenZ-s, AtsushiA, HuP, KashiwagT. Theoretical and experimental study on surface tension and dynamic surface tension of aqueous lithium bromide and water with additive [J]. Sci China E, 2003, 46: 191-203

[10] EijiH, SatoshiK, MototsuguY, TakamotoS. Prediction of surface tension of aqueous solutions of lithium bromide with alcoholic additives [J]. Trans Japan Soc Refrig & Air Conditioning Eng, 2011, 10: 257-263

[11] NaoeS, KiyoshiO. Surface tension characteristics of aqueous lithium bromide solution with alcoholic surfactant [J]. Trans Japan Soc Refrig & Air Conditioning Eng, 2011, 27: 103-109

[12] GaoS-q, LiuH-pengCapillary mechanics [M], 2010BeijingScience Press103

[13] WuR-y, WuW-d, ChenS-x, PangC-w, LiuS-mei. Research progress in heat and mass transfer enhancement of the ammonia falling film absorption [J]. Cryogenics and Superconductivity, 2010, 38(12): 49-53

[14] RenW-h, LinZ-q, PengD-lin. Relationship between the liquid surface tension coefficient and the temperature and the concentration [J]. J Hunan Agr Univ (Natural Sci), 2004, 30(1): 77-79

[15] TanX-wen. Experimental study on the relationship between the liquid surface tension coefficient and the temperature [J]. J Southwestern China Normal Univ (Natural Sci), 2007, 32(4): 115-118

[16] MeiC-x, WangG-p, LiuYu. Experimental study on the relationship between the liquid surface tension coefficient and the temperature and the concentration [J]. J Xianyang Normal Univ, 2008, 23(6): 21-22

[17] ChoiS U S. Enhancing thermal conductivity of fluids with nanoparticles, developments and applications of non-Newton flows [J]. Appl Phys A: Mat Sci & Proce, 1995, 66: 99-105