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Michael Delichatsios

Bio: Michael Delichatsios is an academic researcher from Ulster University. The author has contributed to research in topics: Combustion & Cone calorimeter. The author has an hindex of 31, co-authored 121 publications receiving 2743 citations. Previous affiliations of Michael Delichatsios include Tokyo University of Science & University of Science and Technology of China.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a simple model of the ceiling flow induced by fire centrally located at the floor between two long unobstructed ceiling beams of such depth that no fire gases are able to leak to adjacent beam channels is presented.

179 citations

Journal ArticleDOI
01 Jan 2007
TL;DR: In this paper, the physics and new relations for flame heights and heat fluxes are underpinned for flames on facade emerging from (under-ventilated) ventilation controlled fires at the floor of fire origin.
Abstract: Fire spread in high rise buildings from floor to floor occurs if flames emerge and extend on the facade of the building to cause ignition in floors above the floor of fire origin. Even though considerable effort has been exerted to address this issue, proposed relations for flame heights and heat fluxes are incomplete and contradictory because the relevant physics have been poorly clarified. By performing numerous experiments in small scale enclosures having various door-like openings and fire locations, the physics and new relations are underpinned for flames on facade emerging from (under-ventilated) ventilation controlled fires at the floor of fire origin. To limit the variables and uncertainties, propane and methane gas burners created controlled (theoretical) heat release rates at the source. Gas temperatures inside the enclosure and at the opening, heat fluxes on the facade wall, flame contours (by a CCD camera) and heat release rates (by oxygen calorimetry) inside and outside the enclosure have been measured. The gas temperatures inside the enclosure were uniform for aspect ratio (length to width) of the enclosure varying from one to three to one. Previous relations for the air inflow and heat release rate inside the enclosure were verified. These flames are highly radiative because soot can be formed at high temperatures inside the enclosure before the combustion gases and the unburned fuel exit the enclosure. Remarkably the efficiency of combustion is one for well over-ventilated and very under-ventilated fires by it dropped to 80% for burning conditions around stoichiometric. The flame height and heat fluxes have been well correlated by identifying new length scales related to the effective area of the outflow and the length after which the flow turns from horizontal to vertical due to buoyancy. The results can be used for engineering calculations for real fires and for validation of new large eddy scale simulation models.

160 citations

Journal ArticleDOI
TL;DR: In this article, a scale model of an 0.8m cubic fire compartment with six window-like geometries and an attached 3m (wide) × 5m (high) facade wall was used.

144 citations

Journal ArticleDOI
01 Jan 1979
Abstract: This study concerns physical modeling of the initial fire environment generated by fire in an enclosure, which persists up to that time in a fire when recirculation of combustion products begins to influence the further yield of products. It was the primary purpose to investigate experimentally the validity of modeling relations, proposed previously, for the convective flow generated by “power-law” fires, i.e., fires growing in heat-release rate with a specific power of time from ignition. Three wood-crib fires of different fire-growth rates were combined with three different ceiling heights under large flat ceilings for a total of nine experimental configurations. The experimental fires were power-law fires growing with the second power of time. Temperatures and velocities were measured in the hottest gas layer under the ceiling. The data were shown to be well correlated in nondimensional variables of the modeling theory. It was possible to establish analytical expressions for the nondimensional temperature and velocity fields. A useful finding, which appears to be valid also for other kinds of fire growth than that investigated (including steady fires), is that the local gas velocity in the hottest layer can be related directly to the local temperature rise and ceiling clearance, regardless of fire-growth rate and time from ignition.

122 citations

Journal ArticleDOI
TL;DR: In this article, the authors used a cone calorimeter modified to supply air at reduced oxygen concentrations, and measured the ignition times and mass loss rates of the solid at ignition.

96 citations


Cited by
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Journal ArticleDOI
TL;DR: The increasing demand for new food packaging materials which satisfy people requirements provided thrust for advancement of nano-materials science as discussed by the authors, and the increasing need for new packaging materials with high barrier and barrier properties has driven the research and development in polymeric materials coupled with appropriate filler, matrix-filler interaction and new formulation strategies.

492 citations

Journal ArticleDOI
TL;DR: In this paper, the authors highlight the ecological impacts of using conventional flame retardants, thereby signifying the necessity to use eco-friendly agents, and explore the use of various nanofillers for this purpose, compare their performance with traditional systems, provide insights into different testing standards and combustion mechanisms, modelling aspects of the combustion behavior, and identify novel approaches that could be considered for meeting the fire safety standards with ecofriendly materials.

488 citations

Journal ArticleDOI
TL;DR: In this article, a review of the available literature on human behaviour in a fire so far as building safety is concerned is presented as an overview of the critical factors which determine occupants' fire response performances, namely the characteristics of fire, human beings and buildings.

462 citations