Study of Heat Insulation Material Thermal Conductivity by a Hot-Wire Method

Vartanyan, G. A.; Gerasimov, R. I.; Pyren’kin, O.; Долбилова, И. Б.; Oistrakh, A. V.; Сомов, А. А.

doi:10.1007/s11148-016-9979-5

Cited by 6 publications

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“…The thermal conductivity of the gas within the glass bubble is 0.04 W/(mK) [ 26 ] and its solid wall has a thermal conductivity of 1.03 W/(mK) [ 70 ]. The presence of an interior gas core in the glass bubble and its increasing concentration within the geopolymer concrete will nominally decrease the thermal conductivity of the latter due to the presence of small-closed pores in the former mitigating air convection [ 63 , 64 , 71 , 72 ], and this effect of decreasing thermal conductivity is amplified with increasing concentrations (loadings) of glass bubble within the geopolymer concrete [ 73 ].…”

Section: Resultsmentioning

confidence: 99%

“…Relative to the steady-state methods, this technique keeps the temperature constant, which guarantees accurate measurements [ 41 , 47 , 56 , 62 ]. The testing is performed by recording the voltage/resistance variations when the plane sensor element is electrically heated (electrical current pulse) [ 63 ]. The value of its electric resistance R ( t ) in the sensor can be represented as a function in terms of the average temperature increase ∆ T ( t ) of the sensor element in the first approximation in Equations (7) and (8), as:

…”

Section: Methodsmentioning

confidence: 99%

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Properties of a New Insulation Material Glass Bubble in Geopolymer Concrete

et al. 2021

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This paper details analytical research results into a novel geopolymer concrete embedded with glass bubble as its thermal insulating material, fly ash as its precursor material, and a combination of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) as its alkaline activator to form a geopolymer system. The workability, density, compressive strength (per curing days), and water absorption of the sample loaded at 10% glass bubble (loading level determined to satisfy the minimum strength requirement of a load-bearing structure) were 70 mm, 2165 kg/m3, 52.58 MPa (28 days), 54.92 MPa (60 days), and 65.25 MPa (90 days), and 3.73 %, respectively. The thermal conductivity for geopolymer concrete decreased from 1.47 to 1.19 W/mK, while the thermal diffusivity decreased from 1.88 to 1.02 mm2/s due to increased specific heat from 0.96 to 1.73 MJ/m3K. The improved physicomechanical and thermal (insulating) properties resulting from embedding a glass bubble as an insulating material into geopolymer concrete resulted in a viable composite for use in the construction industry.

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Section: Resultsmentioning

confidence: 99%

…”

Section: Methodsmentioning

confidence: 99%

Properties of a New Insulation Material Glass Bubble in Geopolymer Concrete

et al. 2021

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“…: a, ideal; b, nonideal) . There are different procedures that can be followed to obtain a correct and stable measurement, e.g., the GOST 12170 procedure, used for powder refractories . However, Vartanyan et al , state that this procedure is convenient up to 0.18 Wm −1 K −1 , but inadequacies are present for higher thermal conductance materials.…”

Section: Numerical Simulation Toolmentioning

confidence: 99%

Numerical mesh generation tool for thermal conductivity simulations of nanoparticle filled inorganic plates

Latré

Pooter

Seveno

et al. 2018

Polymer Engineering & Sci

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Since regulations on insulation building materials become more stringent, particular interest is growing in thermal low conductive composite building materials. By adding very expensive, low thermal conductive nanoparticles in widely used inorganic solid materials, a new high performance building material can be developed. To sufficiently balance the production cost and the use of the nanofillers, an automatic tool, PreCon, was developed to provide sufficient process information and to generate a general purpose numerical model which can be used for thermal insulation simulations. It is expected that a total random distribution of the particles in the inorganic matrix will not result in a significant increase in insulation properties and hence will not enhance the performance. PreCon is used to investigate the influence of a random distributed nanomaterial combined with a more normal distribution through thickness. Based on this information, one can gauge the efforts needed to localize the nanoparticles in particular regions. However, accurate and repetitive thermal conductivity measurements of real dispersions are very difficult and precarious to obtain. Nevertheless, combining PreCon with Siemens simulation software provides appropriate nanofiller distributions with respect to cost. The realized tool is also able to introduce fibrous material distributions as a composite reinforcement. POLYM. ENG. SCI., 58:568-585, 2018.

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Combined Refractory Materials with Addition of Technogenic Waste for Metallurgical Assemblies

Bazhin

Glazev

2021

Refract Ind Ceram

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Study of Heat Insulation Material Thermal Conductivity by a Hot-Wire Method

Cited by 6 publications

References 0 publications

Properties of a New Insulation Material Glass Bubble in Geopolymer Concrete

Properties of a New Insulation Material Glass Bubble in Geopolymer Concrete

Numerical mesh generation tool for thermal conductivity simulations of nanoparticle filled inorganic plates

Combined Refractory Materials with Addition of Technogenic Waste for Metallurgical Assemblies

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