Author
Nobuyoshi Kawabata
Other affiliations: Kanazawa University
Bio: Nobuyoshi Kawabata is an academic researcher from Komatsu University. The author has contributed to research in topics: Smoke & Natural ventilation. The author has an hindex of 9, co-authored 32 publications receiving 315 citations. Previous affiliations of Nobuyoshi Kawabata include Kanazawa University.
Papers
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TL;DR: In this article, an evacuation experiment in a full-scale tunnel filled with smoke has been done in order to clarify the relation between extinction coefficient up to Cs = 1.0, which includes Cs= 0.4m−1 as a Japanese road tunnel fire prevention standard, and evacuation speed.
71 citations
TL;DR: In this article, the authors investigated the characteristics of the spread of smoke in a shallow urban road tunnel with roof openings in its ceiling, where the smoke produced by a fire is ventilated through the openings in the ceiling given the natural buoyancy of hot smoke.
54 citations
TL;DR: In this article, the authors examined the exhaust performance of a hybrid ventilation strategy for maintaining a safe evacuation environment for tunnel users in a tunnel fire, which combines the longitudinal ventilation strategy with the point ventilation strategy which is a type of transverse ventilation strategy.
54 citations
TL;DR: In this paper, a quantitative method for assessing road tunnel fire safety based on a numerical simulation of in-smoke evacuation is proposed, where evacuees are generally in the same space as the fire source but evacuation direction is almost one dimension, a new one-dimensional evacuation simulation was developed wherein the self-determined evacuation necessity detection factors were modeled.
47 citations
TL;DR: In this article, a 1:12 scale model tunnel was used to evaluate effects of a transverse external wind on the performance of roof openings in a shallow urban road tunnel under fire conditions.
39 citations
Cited by
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01 Jan 1997
TL;DR: The boundary layer equations for plane, incompressible, and steady flow are described in this paper, where the boundary layer equation for plane incompressibility is defined in terms of boundary layers.
Abstract: The boundary layer equations for plane, incompressible, and steady flow are
$$\matrix{ {u{{\partial u} \over {\partial x}} + v{{\partial u} \over {\partial y}} = - {1 \over \varrho }{{\partial p} \over {\partial x}} + v{{{\partial ^2}u} \over {\partial {y^2}}},} \cr {0 = {{\partial p} \over {\partial y}},} \cr {{{\partial u} \over {\partial x}} + {{\partial v} \over {\partial y}} = 0.} \cr }$$
2,598 citations
TL;DR: In this article, the effect of strong environmental wind on a tunnel fire under natural ventilation was investigated using large eddy simulation method in order to investigate the smoke movement under the stack effect induced inside a shaft.
116 citations
TL;DR: In this article, the authors conducted a statistical analysis of tunnel fire accidents in China 2000-2016 and found that over half of TFAs in China result from vehicle technical problem, and the most TFAs occurred in the summer and winter seasons and the autumn season experiencing the least.
105 citations
TL;DR: In this article, an overview of research on fire safety in underground road and railway tunnels from the perspectives of fire safety design is presented, focusing on design fires, structural protection, smoke control and use of water-based fire suppression systems.
103 citations
TL;DR: In this article, an evacuation experiment was performed in a road tunnel in Stockholm in July 2014, where sixty-six participants, who were instructed to individually evacuate the tunnel, took part, and participants' walking speeds were measured in a smoke-filled section, as well as in smoke-free section, of the tunnel.
89 citations