Measurement of apparent thermal conductivity of multilayer insulations at low compressive loads

1972 ◽  
Author(s):  
V. HOLMES ◽  
L. MCCRARY ◽  
D. KRAUSE
Keyword(s):  
Thermal Conductivity ◽  
Apparent Thermal Conductivity ◽  
Compressive Loads

Measurement of apparent thermal conductivity of regenerator materials in 4-20 K temperature range

Cryogenics ◽  
2021 ◽  
pp. 103300
Author(s):  
Yang Biao ◽  
Xi Xiaotong ◽  
Liu Xuming ◽  
Xu Xiafan ◽  
Chen Liubiao ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Temperature Range ◽  
Apparent Thermal Conductivity

scholarly journals Correction to “New Measurements of the Apparent Thermal Conductivity of Nanofluids and Investigation of Their Heat Transfer Capabilities”

2018 ◽  
Vol 63 (11) ◽  
pp. 4277-4279 ◽  
Author(s):  
Georgia J. Tertsinidou ◽  
Chrysi M. Tsolakidou ◽  
Maria Pantzali ◽  
Marc J. Assael ◽  
Laura Colla ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Apparent Thermal Conductivity

scholarly journals Thermal properties of closed-cell aluminum foam with circular pores

2014 ◽  
Vol 18 (5) ◽  
pp. 1619-1624 ◽  
Author(s):  
Guo-Yun Lu ◽  
Bu-Yun Su ◽  
Zhi-Qiang Li ◽  
Zhi-Hua Wang ◽  
Wei-Dong Song ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Thermal Property ◽  
Cell Size ◽  
Aluminum Foam ◽  
Slight Effect ◽  
Apparent Thermal Conductivity ◽  
Closed Cell ◽  
Simulation Results

The thermal property of closed-cell aluminum foam is studied numerically and the effects of the distribution of the circular pore on the thermal property are studied theoretically. When the convection and radiation are ignored, the effects of porosity, cell size, and distribution forms of pore on the apparent thermal conductivity are investigated. Moreover, the effects of air in the pore on the thermal property are analyzed as well. Simulation results show that apparent thermal conductivity linearly increases with the increase of porosity, while the cell size and the distribution have negligible effects on the thermal property. By comparison, thermal conductivity of air has slight effect on thermal property of foamed aluminum in the context of small size pore.

In situ thermal-conductivity measurements and morphological characterization of intumescent coatings for fire protection

2018 ◽  
Vol 36 (5) ◽  
pp. 419-437 ◽  
Author(s):  
Jiyuan Kang ◽  
Fumiaki Takahashi ◽  
James S T’ien
Keyword(s):  
Thermal Conductivity ◽  
Heat Flux ◽  
Fire Protection ◽  
Heat Fluxes ◽  
Loss Cone ◽  
Char Layer ◽  
Intumescent Coatings ◽  
Apparent Thermal Conductivity ◽  
Initial Coating

Thermal insulating performance and char-layer properties have been studied for water-based intumescent coatings for structural steel fire protection using a new laboratory-scale mass-loss cone apparatus. A specimen (100 × 100 mm mild steel plate; the initial coating thickness: 0.3–2.0 mm) is placed horizontally and exposed to a constant incident radiant heat flux (25, 50, or 75 kW/m2). The apparent thermal conductivity of the expanding char layer is determined in situ based on real-time measurements of the temperature distribution in the char layer and the heat flux transmitted through the char layer. Three-dimensional morphological observations of the expanded char layer are made using a computed tomographic–based analytical method. The vertical variation of the porosity of the expanded char layer is measured. The measured heat-blocking efficiency is correlated strongly with the incident heat flux, which increases the expanded char-layer thickness, and porosity for sufficiently large initial coating thicknesses (>0.76 mm). For a thin coating (0.30 mm), violent off-gassing disrupts the intumescing processes to form a consistent char layer after abrupt exposure to higher incident heat fluxes, thus resulting in lower heat-blocking efficiency. Therefore, the product application thickness must exceed a proper threshold value to ensure an adequate thermal insulation performance.

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