TiO_2-MDEA-H_2O纳米流体热物理性质测量

Measurement of thermophysical properties of TiO_2-MDEA-H_2O nanofluids

为了强化N-甲基二乙醇胺(MDEA)溶液对CO2的吸收,通过将纳米TiO2颗粒分散至质量分数50%的MDEA水溶液中,制备了TiO2-MDEA-H2O纳米流体.通过采用测定纳米流体的吸光度方法对纳米流体的分散稳定性进行研究.结果表明:经过机械分散,在不添加任何分散剂的情况下,纳米流体放置48 h无明显团聚现象.测量了纳米TiO2颗粒质量分数分别为0.05%,0.20%,0.40%和0.80%时纳米流体的热物理性质.结果表明:随着纳米TiO2颗粒质量分数的增加,纳米流体的表面张力、运动黏度和导热系数都增加了.纳米流体的表面张力最大增大了约0.6%,运动黏度最大增大了约4.6%,导热系数最大增加了约5.9%.

In order to enhance the absorption of CO2 in the N-methyldiethanolamine （MDEA） solution, TiO2 -MDEA -H2O nanofluids were prepared by dispersing TiO2, nanoparticles into MDEA solution with MDEA mass fraction of 50%. The stability of nanofluids was determined by the method of absorbance. The results show that only with mechanical agitation, the nanoflu：ids can keep stable for 48 h without any dispersant. The thermophysical properties of MDEA solution were measured when the mass fraction of TiO2 nanoparticles were 0.05%, 0.20%, 0. 40% and 0. 80%, respectively. The results show that sur- face tension, kinematic viscosity and thermal conductivity are increased with the increase of TiO2 nanop- articles mass fraction. The maximum increase of surface tension is 0.6% , and the maximum increase of kinema-tic viscosity is 4. 6% with the maximum increased thermal conductivity of 5.9%.