温度对Al_2O_3-H_2O纳米流体粘度特性影响研究  

Research on influence of temperature on viscosity property of Al_2O_3-H_2O nanofluid

作　　者：牛广清 凌智勇[1] 张忠强[1] 黄跃涛 

机构地区：[1]江苏大学微纳米科学技术研究中心,江苏镇江212013

出　　处：《传感器与微系统》2015年第12期54-56,共3页Transducer and Microsystem Technologies

基　　金：国家自然科学基金面上项目(11472117);国家自然科学基金青年基金资助项目(11102074)

摘　　要：采用＂两步法＂制备了质量分数分别为0.1%,0.5%,1%的Al2O3-H2O纳米流体,研究了温度在25-50℃范围内纳米流体粘度和相对粘度的变化规律,发现粘度随温度的升高而减小,而相对粘度随温度升高的变化与纳米粒子质量分数有关。质量分数w=0.1%和w=0.5%时,纳米流体相对粘度随温度升高几乎不发生变化,w=1%的纳米流体相对粘度随温度升高变化幅度较大;同时发现温度保持在50℃时,w=0.1%和w=0.5%的纳米流体粘度随恒温保持时间的延长变化很小,而w=1%的纳米流体粘度却减少了14.0%,经恒温保持24 h后自然冷却的纳米流体再次加热,发现其粘度较之前整体有所下降。An experimental investigation employing two-step method is conducted on the viscosities and relative viscosities of Al2O3-H2 O nanofluids with mass fractions of 0. 1 %,0. 5 % and 1 % at range of 25 - 50 ℃. The results show that viscosities decreased with temperature increasing; however,relative viscosities change with temperature increasing which are related to mass fractions of nanoparticles. Relative viscosities of nanofluids vary barely with temperature rising with fractions of w = 0. 1 % and w = 0. 5 %,whereas amplitude of temperature variation is greater in higher concentration,w = 1 %. Simultaneously,it is demonstrated that while temperature is kept at 50 ℃,no significant variation in viscosities of nanofluids with w = 0. 1 % and w = 0. 5 %,while viscosities of nanofluids with w = 1 % decrased by 14. 0 %. Furthermore,an overall decline happened to those viscosities of nanofluids reheated after cooling naturally comparing with the viscosities of nanofluids without keeping constant temperature at 50 ℃ for 24 h.

关 键 词：微机电系统 纳米流体 粘度 相对粘度 恒温 

分 类 号：O357.1[理学—流体力学]