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. a) The 100 ml + weight's water level; b) the foam glass and the weight in 100 ml of water 2.3.2 Thermal conductivity The thermal conductivity of each specimen was measured at room temperature by using a C-Therm TCi laboratory instrument. Each
. , Kalmár F. ( 2013 ), Investigation of thickness and density dependence of thermal conductivity of expanded polystyrene insulation materials . Materials and Structures , 46 , 1101 – 1105 . [4
agent is of great importance to achieve the product with the required technical properties [ 9 ]. The glass-ceramic foams normally possess fascinating characteristics, including high durability, low thermal conductivity, lightweight, high corrosion
sintering temperature leads to an increase in the thermal conductivity and mechanical strength. The bricks’ thermal conductivity is highly connected to many factors, including raw material composition, firing temperature, and the porosity of the fired bricks
) + S E where SE denotes the energy equation's source term. Thermal conductivity, denoted by k , is computed as follows: (6) k = α l k l + α v k v The mass-averaged variables, i.e., the energy term ( E ), are given by the equation below. (7) E = α l ρ l
that can be generated by viscous dissipation, thermal conductivity or other physical properties [ 3 ]. Whatever the medium in which instability arises, the motion of the fluid particles caused by buoyancy effects is always driven either by the
consumption (BSFC), and high NO x emissions compared to diesel; to avoid these problems different additives were used. Nano-additives consist of high surface to volume ratio, high calorific value, and high thermal conductivity, So it enhances the performance
. Vosteen , H. , R. Schellschmidt 2003 : Influence of temperature on the thermal conductivity and thermal diffusivity for different types of rock . — Physics and Chemistry of the Earth , 28 , pp. 499 – 509
Abstract
We present an improved methodology for a thermal transient method enabling simultaneous measurement of thermal conductivity and specific heat of nanoscale structures with one-dimensional heat flow. The temporal response of a sample to finite duration heat pulse inputs for both short (1 ns) and long (5 μs) pulses is analyzed and exploited to deduce the thermal properties. Excellent agreement has been obtained between the recovered physical parameters and computational simulations through choosing an optimized pulse width.
Organic polymers - carbon nanotubes nanocomposites are synthesized either by mechanical mixing of the two components or by covalently linking the nanotubes to the matrix. The various procedures will be overviewed and the determining factors will be identified for the best mechanical properties of the composites. On the other hand, it will be shown that for highest electrical conductivity much smaller amounts of carbon nanotubes are needed if the nanotubes can be aligned. The thermal conductivity of the nanocomposites will also be overviewed. Finally, together with nanoclay particles, nanotubes are inducing remarkable flame retardant properties in the nanocomposites materials.
