منابع مشابه
Measuring Thermal Conductivity by Ångstrom’s Method
In this experiment, κ, the thermal conductivity of a rod of brass, was measured by periodically heating one end of the rod. Turning the heater attached to the rod on and off with a 10 mHz square wave signal, waves of heat were sent along the length of the rod, measured by two thermistors a distance ∆x apart. Taking these temperatures as a function of time, a Fourier transform was applied to a 1...
متن کاملMeasuring the thermal conductivity of a single carbon nanotube.
Although the thermal properties of millimeter-sized carbon nanotube mats and packed carbon nanofibers have been readily measured, measurements for a single nanotube are extremely difficult. Here, we report a novel method that can reliably measure the thermal conductivity of a single carbon nanotube using a suspended sample-attached T-type nanosensor. Our experimental results show that the therm...
متن کاملExperimental Setup for Measuring the Thermal Conductivity of Pressurized Solutions
Knowledge about the thermal conductivity is expedient whenever heat transport is involved in a process. As pressure plays an important role in a multitude of treatments or reactions, conductivity measurements have also been carried out under pressure for various substances (e. g. lubricants, plant oils and several foods). Experimental data are needed as this property cannot be derived from equa...
متن کاملFractal aggregation kinetics contributions to thermal conductivity of nano-suspensions in unsteady thermal convection
Nano-suspensions (NS) exhibit unusual thermophysical behaviors once interparticle aggregations and the shear flows are imposed, which occur ubiquitously in applications but remain poorly understood, because existing theories have not paid these attentions but focused mainly on stationary NS. Here we report the critical role of time-dependent fractal aggregation in the unsteady thermal convectio...
متن کاملDevelopment and Calibration of a Large-Scale Thermal Conductivity Probe
A large-scale probe has been developed for measuring the thermal conductivity of geomaterials. The large probe was designed to conduct tests on materials containing large particles, materials with high heterogeneity, and materials with high stiffness. The probe has dimensions of 680 mm length and 15.9 mm diameter and was constructed of stainless steel tubing. The probe operates on the principle...
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ژورنال
عنوان ژورنال: National Science Review
سال: 2017
ISSN: 2095-5138,2053-714X
DOI: 10.1093/nsr/nwx092