Author
Masato Hasegawa
Other affiliations: Ishikawa National College of Technology
Bio: Masato Hasegawa is an academic researcher from Kanazawa University. The author has contributed to research in topics: Smoke & Wetting. The author has an hindex of 6, co-authored 20 publications receiving 141 citations. Previous affiliations of Masato Hasegawa include Ishikawa National College of Technology.
Topics: Smoke, Wetting, Froude number, Drag, Digital image processing
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 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 paper, the authors investigated experimentally the evacuation speed in a full-scale tunnel filled with smoke and clarified the relation between the extinction coefficient (up to 1.6m−1) and normal walking speed.
32 citations
TL;DR: In this article, the backlayering distance of thermal fumes in a tunnel fire was examined by using a large-scale model tunnel and a new expression was proposed to calculate the dimensionless backlayer distance based on dimensionless heat release rate and Froude number.
Abstract: In this study, the backlayering distance of thermal fumes in a tunnel fire was examined by using a large-scale model tunnel. A 1/5-scale model was constructed taking into consideration both the similarity of thermal characteristics in the wall and Froude similarity. Experimental parameters were the heat release rate of the fire source and the longitudinal ventilation velocity. The following conclusions were obtained. A new expression was proposed to calculate the dimensionless backlayering distance based on the dimensionless heat release rate and Froude number. Constants included in this expression were obtained from experimental data by using the least-squares method. The backlayering distance calculated by the new expression was compared with that calculated by previous expressions developed by other researchers. The new expression has the ability to calculate not only the backlayering distance but also the critical velocity.
19 citations
12 citations
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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 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 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
TL;DR: Experimental studies of pedestrian dynamics published between April 2017 and July 2019 are reviewed to capture the unprecedented growth of the experimental literature, analyse the ways in which the research landscape is changing and identify the emerging topics.
64 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