中国物理B ›› 2018, Vol. 27 ›› Issue (9): 94703-094703.doi: 10.1088/1674-1056/27/9/094703

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Cavity formation during water entry of heated spheres

Jia-Chuan Li(李佳川), Ying-Jie Wei(魏英杰), Cong Wang(王聪), Wei-Xue Xia(夏维学)   

  1. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China
  • 收稿日期:2018-02-27 修回日期:2018-05-15 出版日期:2018-09-05 发布日期:2018-09-05
  • 通讯作者: Ying-Jie Wei E-mail:weiyingjie@gmail.com
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11672094).

Cavity formation during water entry of heated spheres

Jia-Chuan Li(李佳川), Ying-Jie Wei(魏英杰), Cong Wang(王聪), Wei-Xue Xia(夏维学)   

  1. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China
  • Received:2018-02-27 Revised:2018-05-15 Online:2018-09-05 Published:2018-09-05
  • Contact: Ying-Jie Wei E-mail:weiyingjie@gmail.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11672094).

摘要:

We experimentally study the cavity formation when heated spheres impact onto water at low and high subcooling. The observations present that the formation and appearance of the cavity are affected by the boiling modes and the heat transfer intensity. In the nucleate-boiling regime, a rough cavity can be formed at a rather low impact velocity, while at the same velocity, the cavity formed in the film-boiling regime may have a very smooth interface with a stable vapor layer around the sphere. We discuss the effects of the impact speed, water and sphere temperatures on the stability of the vapor layer. For low subcooled water, the stable vapor layer will be disturbed when increasing the impact velocity, leading to a disturbed cavity. For high subcooled water, the film boiling has a particular boiling model in which the vapor layer around the sphere cannot keep its stability. In this particular film-boiling regime, no cavities can be formed at low impact velocities and only broken cavities can be formed at high impact velocities.

关键词: water-entry cavity, boiling, vapor layer

Abstract:

We experimentally study the cavity formation when heated spheres impact onto water at low and high subcooling. The observations present that the formation and appearance of the cavity are affected by the boiling modes and the heat transfer intensity. In the nucleate-boiling regime, a rough cavity can be formed at a rather low impact velocity, while at the same velocity, the cavity formed in the film-boiling regime may have a very smooth interface with a stable vapor layer around the sphere. We discuss the effects of the impact speed, water and sphere temperatures on the stability of the vapor layer. For low subcooled water, the stable vapor layer will be disturbed when increasing the impact velocity, leading to a disturbed cavity. For high subcooled water, the film boiling has a particular boiling model in which the vapor layer around the sphere cannot keep its stability. In this particular film-boiling regime, no cavities can be formed at low impact velocities and only broken cavities can be formed at high impact velocities.

Key words: water-entry cavity, boiling, vapor layer

中图分类号:  (Cavitation and boiling)

  • 47.55.dp
47.54.De (Experimental aspects) 68.35.Rh (Phase transitions and critical phenomena)