Suppression of ice nucleation in supercooled water under temperature gradients

• 作者: Li-Ping Wang Wei-Liang Kong Pei-Xiang Bian Fu-Xin Wang Hong Liu
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY
• 页码范围: 749-759
• 页数: 11页
• 语种: 英文
• DOI: 10.1088/1674-1056/abd764

摘要

Understanding the behaviours of ice nucleation in non-isothermal conditions is of great importance for the preparation and retention of supercooled water.Here ice nucleation in supercooled water under temperature gradients is analyzed ther-modynamically based on classical nucleation theory (CNT).Given that the free energy barrier for nucleation is dependent on temperature,different from a uniform temperature usually used in CNT,an assumption of linear temperature distribution in the ice nucleus was made and taken into consideration in analysis.The critical radius of the ice nucleus for nucleation and the corresponding nucleation model in the presence of a temperature gradient were obtained.It is observed that the crit-ical radius is determined not only by the degree of supercooling,the only dependence in CNT,but also by the temperature gradient and even the Young's contact angle.Effects of temperature gradient on the change in free energy,critical radius,nucleation barrier and nucleation rate with different contact angles and degrees of supercooling are illustrated successively.The results show that a temperature gradient will increase the nucleation barrier and decrease the nucleation rate,particu-larly in the cases of large contact angle and low degree of supercooling.In addition,there is a critical temperature gradient for a given degree of supercooling and contact angle,at the higher of which the nucleation can be suppressed completely.