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在低温共晶盐BaCl2水溶液中悬浮少量的纳米TiO2颗粒(粒径20nm),经过超声波振荡,制备成体积分数为1·13%的TiO2BaCl2H2O纳米流体。对BaCl2溶液和TiO2BaCl2H2O纳米流体的蓄冷特性进行了实验比较。结果表明,加入纳米TiO2粉体后,可降低BaCl2溶液的过冷度;在同样时间内,纳米流体的蓄冷量要大于BaCl2溶液。
A small amount of nano-sized TiO2 particles (particle diameter: 20 nm) were suspended in a low-temperature eutectic salt solution of BaCl2 and then subjected to ultrasonic oscillation to prepare a TiO2BaCl2H2O nanofluid with a volume fraction of 1.13%. The cold storage characteristics of BaCl2 solution and TiO2BaCl2H2O nanofluids were compared experimentally. The results show that the addition of nano-TiO2 powder can reduce the undercooling of the BaCl2 solution; in the same time, the storage capacity of the nanofluid is greater than that of the BaCl2 solution.