The Influence of the Heat Transfer Mode on the Stability of Foam Extinguishing Agents

Author:

Zhou Xia12ORCID,An Zhihao1,Liu Ziheng1,Ha Hongjie1,Li Yixuan1,Pan Renming1

Affiliation:

1. School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

2. School of Fashion and Textiles, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong, China

Abstract

The mass loss mechanisms of an aqueous film-forming foam (AF foam), an AR/AFFF water-soluble film-forming foam extinguishing agent (AR foam), and a Class A foam extinguishing agent (A foam) at different levels of thermal radiation, thermal convection, and heat conduction intensity were studied. At a relatively low thermal radiation intensity, the liquid separation rate of the AF, AR, and A foams is related to the properties of the foam itself, such as viscosity and surface/interface tension, which are relatively independent of the external radiation heat flux of the foam. At low radiation intensity (15 kW/m2 and 25 kW/m2), the liquid separation rate of the AF and A foams is relatively stable. When the heat flux intensity is 35 kW/m2, the liquid separation rate of the AF and A foams increases notably, which may be mainly due to the rapid decrease in foam viscosity. And the mass loss behavior is dominated by liquid separation in the AF, AR, and A foams under the influence of thermal radiation and thermal convection. Under the same experimental conditions, the liquid separation rate of AF is the fastest. There is no significant difference in the evaporation rates of the three kinds of foam in the same heat conduction condition. In addition, the AR and A foams usually have a 25% longer liquid separation time (t) under thermal radiation and thermal convection, and the thermal stability is better than AF foam. The temperature reached by the AF foam layer under thermal convection was lower than that of the AR and A foams, and the time for the foam layer to reach the highest temperature under heat conduction was longer than that of the AR and A foams.

Funder

Renming Pan

Publisher

MDPI AG

Reference37 articles.

1. Research progress of positive pressure foam extinguishing technology;Deng;China Saf. Sci. J. (CSSJ),2019

2. Environmental performance assessment for foam extinguishing agent and research progress;Hu;Environ. Prot. Chem. Ind.,2020

3. A review of fire-extinguishing agent on suppressing lithium-ion batteries fire;Yuan;J. Energy Chem.,2021

4. Zhang, Y., Tian, Z., Ye, Q., and Lu, Y. (2023). Research progress of gel foam extinguishing agent in coal mines. Fire, 6.

5. Research on preparation of film-forming colloidal foam and its fire extinguishing and cooling characteristics;Shi;China Saf. Sci. J. (CSSJ),2022

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3