Effect of ultrasonic power on super-cooling of TiO2 nanoparticle suspension

被引：12

作者：

Jia, L. S. ^{[1
]}

Cui, W. ^{[1
]}

Chen, Y. ^{[1
]}

Li, Y. A. ^{[1
]}

Li, J. ^{[1
]}

机构：

[1] Guangdong Univ Technol, Sch Mat & Energy, Guangzhou 510006, Guangdong, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2018年 / 120卷

基金：

中国国家自然科学基金;

关键词：

Nanoparticle suspension; Solidification; Super-cooling; Ultrasonic power; THERMAL-ENERGY STORAGE; PHASE-CHANGE; NUCLEATION; NANOFLUIDS; WATER; ICE; CAVITATION; BEHAVIOR; GRAPHENE; SYSTEM;

D O I：

10.1016/j.ijheatmasstransfer.2017.12.128

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Ultrasound was used to control the super-cooling degree of TiO2 nanoparticle suspension. The effects of ultrasonic power and nanoparticle concentration were investigated. Results showed that ultrasound can reduce the super-cooling degree of nanoparticle suspension, and the reduction rate increases with ultrasonic power and nanoparticle concentration. The mechanism of ultrasound-controlled nucleation was analyzed. The small bubbles formed by rectified diffusion at low ultrasonic powers initiated ice nucleation through their collapse, and the large bubbles formed by bubble coalescence at high ultrasonic powers initiated ice nucleation by providing heterogeneous nucleation sites. The nucleating effect of bubble coalescence-induced bubbles is more significant than that of rectified-diffusion-induced bubbles. Moreover, the controlled super-cooling degree by rectified-diffusion-induced bubbles for TiO2 nanopartide suspension is lower than that for pure water; whereas the advantage of nanoparticle suspension over pure water on the super-cooling degree disappears when the solidification is controlled by bubble-coalescence-induced bubbles. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：909 / 913

页数：5

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