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Recommended Papers for: specific heat capacity

Total Papers Found: 24

Estimation of the thermal properties of hardened cement paste on the basis of guarded heat flow meter measurements

A new analysis method based on the guarded heat flow meter apparatus is proposed to measure the thermal properties of cement-based pastes in a hydrated form. In a steady state, a specimen with 0.4 water-to-cement ratio was found to have a thermal conductivity and a thermal contact resistance of 1.28Wm−1 K−1 and 0.038 m−2 KW−1. A computerized system of heat flow meters provided non-steady ...

Author(s): , ,

Intercomparison of Measurements of the Thermophysical Properties of Polymethyl Methacrylate

The variability within the results presented from the guarded hot-plate (GHP) and guarded heat-flow meter (GHF) methods was determined. Multiple thermal properties of polymethyl methacrylate (PMMA) were analyzed to compare methods. These measurements are taken in the range of −70◦C and +80◦C. Providing reference data for PMMA is the main objective of this paper as well as quantifying the effects of thermal contact of the measuring instruments....

Author(s): ,

Thermal properties of polymer-matrix composites re-inforced with E-glass fibers

Glass-fiber reinforced polymer-matrix composites are widely used in electro and automotive industry due to their easy processing, low cost, and possibility to tailor properties. Functional properties of the composites strongly depend on their weight fractions and individual properties of constituents. In this study, E-glass fiber (EGF) weight and microstructure are analyzed to see the effect on thermal properties of the composites. Thermal transport properties of the composites were measured at ...

Author(s): , , ,

Ethyl and isopropyl alcohol blends as alternative secondary fluids

Methyl and ethyl alcohol have good thermophysical characteristics for use in refrigeration systems. The purpose of this study was to measure the thermal conductivity of ethyl and methyl alcohol solutions to determine if they can become competitive secondary fluids. A Thermal Constants Analyzer measured the thermal conductivity of various 20-wt% ethyl alcohol and 20 wt-% propyl alcohol solutions using the Transient Plane Source (TPS) method. Measurements were taken after 1, 2, and 3 seconds ...

Author(s): , ,

Effects of melting temperature and the presence of internal fins on the performance of a phase change material (PCM)-based heat sink

Two organic phase change materials (PCMs) were investigated to determine their effects on the thermal management capabilities of electronics. The thermo-physical properties of n-eicosane and 1-hexadecanol were determined experimentally, and the two PCMs were then added to unfinned, and finned heat sinks. It was determined that a PCM with a high melting point is able to increase the time of protection from overheating; however, it was also determined that if ...

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