Influence of U-shaped structure on upward flame spread and heat transfer behaviors of PMMA used in building thermal engineering

Thermal diffusivity from Fourier’s inverse problem supervised by an optimization model: Theoretical analysis and experimental validation

“…The experimental apparatus, supervised by the optimization model, has been successfully tested on a PMMA specimen, which can be considered as a reference material since its thermal properties have been widely studied [44]. Moreover, the data on PMMA are available in the scientific literature since it is broadly employed in many applications of engineering [45,46]. Indeed, this material adequately fulfills the assumptions adopted in the present study for reducing the 3D to a 2D problem.…”

Physical properties of zircon‐filled poly(methyl methacrylate) composites following heating around its glass transition temperature

“…Zircon-filled poly(methyl methacrylate) (PMMA) is a transparent polymer widely used in engineering plastic. [1][2][3] It exhibits excellent transparency, substantial impact resistance, good tensile strength, high resistance to atmospheric effects, and electrical resistance compared to other polymers. 4,5 Due to these properties, PMMA is applicable in nuclear, medical, engineering, and optics fields.…”

Research on thermal and central flame spread behaviors over insulation material EPS in different concave structure cases

“…In recent years, in order to solve the increasingly serious energy shortage problem and respond to the energy-saving policies of the world, the use of thermal insulation materials for building exterior walls has become an effective measure. An excellent thermal insulation material, EPS (molded polystyrene) has been widely application in the external thermal insulation system of buildings.Meanwhile, the rapid development of construction industry has promoted the diversification of building facade forms.Especially, concave structures are found in buildings due to their excellent lighting and ventilation performance [1][2][3].However, the unique concave structures often promote flame spread and raise the risk of fire.For example, a fire broke out in a high-rise apartment in Busan,South Korea in October 2014.The referred concave structure made the flame spread fast to the top floor.…”

“…Many scholars have carried out a large number of experimental studies on the influence of concave structures on flame spread over insulation materials [4][5][6][7][8][9][10][11][12][13]. Zhou et al [4] evaluated the effectiveness of vertical fire barriers in preventing flame spread over exterior insulation wall made of EPS panels.The whole geometry was similar to several concave structures.…”

“…Zhou et al [4] evaluated the effectiveness of vertical fire barriers in preventing flame spread over exterior insulation wall made of EPS panels.The whole geometry was similar to several concave structures. Cai et al [5] studied the influence of the depth-width ratio (α) of the closed vertical channel on the downward flame propagation characteristics of XPS (extruded polystyrene), and found that the flame spread speed increased with the increase of α.An et al [6][7][8] experimentally revealed XPS flame spread in different concave structures and curtain wall coverage rate.The flame spread rate increased with increasing structure factor α when curtain wall coverage rate β from 0.2 to 0.8.An et al [9]also carried out experimental and theoretical study on upward flame spread over PMMA((polymethyl methacrylate) under different U-shaped structure factors.The correlation between flame height and pyrolysis length was established for different structure factors. Yan et al [10] investigated vertical downward flame spread over XPS with and without sidewalls.it was found that, flame spread rate was proportional to induced air flow speed.…”