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Keywords: thermal conductivity
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eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2021
ISBN: 978-0-8031-7718-5
... was assessed using a 3D concrete printer equipped with a screw pump and two different nozzles. Results showed that increasing the VMA ratio or FACs content decreased the thermal conductivity of cementitious mixtures, while the rate of this decrease was higher for increasing FACs volume ratios. By replacing 60...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2018
ISBN: 978-0-8031-7669-0
... Existing thermal conductivity or R-value data for masonry building materials are very limited and quite dated. Additionally, very little data on heat capacity are available. A convective heat transfer device was designed and built for the purpose of measuring the thermal performance...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2017
ISBN: 978-0-8031-7647-8
... assemblies is most sensitive to moisture storage function, followed by water vapor permeability. In contrast, total moisture content is relatively insensitive to material density, liquid transfer, or thermal conductivity. moisture thermal conductivity WUFI ® polyisocyanurate foam roofing...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2013
ISBN: 978-0-8031-7533-4
... A molecular dynamics technique has been used to study the impact of single vacancies and small vacancy clusters/microvoids on thermal conductivity of β-SiC. It is found that single vacancies reduce thermal conductivity more significantly than do microvoids with the same total number of vacancies...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2012
ISBN: 978-0-8031-7555-6
... are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area diffraction (SAD), and energy dispersive spectroscopy (EDS) to analyze the identity, size, shape, and purity of the powder. A maximum thermal conductivity enhancement of 16 % for Al-5 wt. %Zn and 13 % for Al-5 wt...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2012
ISBN: 978-0-8031-7555-6
... reduction method as well. The fluid was stable up to 5 weeks under stationary conditions at room temperature. This method employs fast, inexpensive, extendible process for the synthesis of copper nanofluids and also overcomes the drawbacks of two step process. Nanofluid thermal conductivity copper...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2898-3
ISBN: 978-0-8031-2898-9
... Thermal conductivity measurements of four thermal insulation reference aterials are presented. The measurements were obtained from an international study of guarded-hot-plate laboratories in Canada, France, Japan, the United Kingdom, and the United States. For each reference material, the study...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2898-3
ISBN: 978-0-8031-2898-9
... A program of work involving measurement of moisture transport properties coupled with guarded hot plate thermal conductivity of some typical masonry materials containing different amounts of moisture has been carried out in support of a large European Union investigation involving the thermal...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2898-3
ISBN: 978-0-8031-2898-9
.... This paper documents some of the extensive thermal modeling and analyses that were carried out in the course of designing this apparatus and characterizing potential errors and uncertainties. In an idealized guarded hot plate apparatus, the effective thermal conductivity is simply computed from the measured...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2898-3
ISBN: 978-0-8031-2898-9
... insulation R-value thermal conductivity thermal insulation thermal resistance Daniel R. Flynn,1Robert R. ZalT,2 Mahn Hee Hahn,3 and William M. Healy2 Design Concepts for a New Guarded Hot Plate Apparatus for Use Over an Extended Temperature Range REFERENCE: Flyrm, D. R., Zarr, R. R., Hahn, M. H...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2898-3
ISBN: 978-0-8031-2898-9
... A round robin interlaboratory comparison of thermal conductivity measurements was performed using the Guarded Hot Plate apparatus at temperatures from about 0°C to 1000 °C. There were twelve participating laboratories including four national laboratories in three different countries...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2898-3
ISBN: 978-0-8031-2898-9
... The National Physical Laboratory has developed a Vacuum Guarded Hot-Plate (VGHP) for measurement of both the total hemispherical emittance and thermal conductivity of insulating materials in a vacuum or gas atmosphere. This paper describes the principles of operation of the VGHP and practical...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2898-3
ISBN: 978-0-8031-2898-9
... properties is demonstrated. Other heat transfer mechanisms that affect the apparent thermal conductivity are also analyzed. Limitations of standard methods for measurement of apparent thermal physical properties of semitransparent fiber materials, including anisotropic materials, are discussed. fiber...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2898-3
ISBN: 978-0-8031-2898-9
..., breaking strength and thermal tests were conducted on commercially available fiberglass and mineral fiber ceiling tiles. Both structural tests show the fiberboard to be between that of the fiberglass and mineral fiber ceiling tiles. The thermal tests show that the minimum apparent thermal conductivity...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2898-3
ISBN: 978-0-8031-2898-9
... that are representative to materials with similar but not exactly the same properties. Monte Carlo Simulation sensitivity approach thermal conductivity hygrothermal material properties WUFI uncertainty pitched roof Andreas H. Holm ~and Hartwig M. Kfinzel 1 The Influence of Measurement Uncertainties...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2002
ISBN-10: 0-8031-2898-3
ISBN: 978-0-8031-2898-9
... Thermal Insulating Foams (CAN/ULC-S 770) are based on accelerating the foam aging process by slicing the foam into thin specimens. This accelerates the diffusion process so that thermal conductivity for foam insulation of varying thickness can be determined in a short period of time, typically less than...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2000
ISBN-10: 0-8031-2855-X
ISBN: 978-0-8031-2855-2
... Fundamental thermal properties of various high water content materials were determined using a number of thermal testing methods. Tests were conducted on peat soils, solid wastes, industrial sludge, and bentonite slurries. Thermal conductivity, heat capacity, and thermal diffusivity were...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2000
ISBN-10: 0-8031-2850-9
ISBN: 978-0-8031-2850-7
... measurements and allows direct examination of the effects of heat capacity. In a second set of experiments, the glass transition of polycarbonate film is measured in the tension mode using different forces and specimen lengths. The results of this study show that low material thermal conductivity and high...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2000
ISBN-10: 0-8031-2871-1
ISBN: 978-0-8031-2871-2
... conditions that characterize flammability. Three incorporate the system-independent properties of heat of combustion, burn ratio, thermal conductivity, and flame temperature; four involve the system-dependent properties of promoted combustion, threshold pressure, oxygen index, and burn rate. A model solution...
eBook Chapter
Series: ASTM Select Technical Papers
Publisher: ASTM International
Published: 2000
ISBN-10: 0-8031-2872-X
ISBN: 978-0-8031-2872-9
... Diffusivity. The experimental data, along with finite element calculations, were used to assess the use of micromechanics-based models in predicting an effective thermal conductivity of damaged composites. thermal conductivity thermal diffusivity flash diffusivity damage micromechanics Samuel...