主管:中华人民共和国应急管理部
主办:应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU

Fire Science and Technology ›› 2023, Vol. 42 ›› Issue (4): 526-530.

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Numerical modeling of firefighting foam spread over horizontal solid surface

Bao Youquan1,2,3, Wang Lu1,2,3, Zhi Huiqiang1,2,3, Du Xia1,2,3   

  1. (1. Tianjin Fire Science and Technology Research Institute of MEM, Tianjin 300381, China; 2. Key Laboratory of Fire Protection Technology for Industry and Public Building, Ministry of Emergency Management, Tianjin 300381, China; 3. Tianjin Key Laboratory of Fire Safety Technology, Tianjin 300381, China)
  • Online:2023-04-15 Published:2023-04-15

Abstract: The mathematical model and numerical method of firefighting foam spread over horizontal solid surface were established, and the transient process of firefighting foam spread over horizontal solid surface and the influence of initial boundary conditions and foam rheology on the foam spreading process were analyzed. The results show that, as the foam layer spreads downstream, the advancing speed of the foam front decreases, and the attenuation amplitude decreases gradually. The rheological behavior of firefighting foam directly determine the vertical position of the yield surface in the foam cover and the shear rate in the yield area, which in turn affects the foam spreading process. The lower yield stress, higher consistency coefficient, and larger flow behavior index of firefighting foam are favorable for foam spreading, resulting in an increase in the spreading distance of the foam layer in a given time, a decrease in the distribution gradient of the foam layer thickness along the horizontal direction, and an increase in the yield area within the foam layer.

Key words: firefighting foam, Herschel-Bulkley fluid, foamspread, yield stress, consistency coefficient, flow behavior index