In this paper,a novel ternary eutectic salt Na_(2)CO_(3)-Li_(2)CO_(3)-LiF was designed and investigated for concentrated solar power(CSP).The FactSage software was used to predict the composition and eutectic point of...In this paper,a novel ternary eutectic salt Na_(2)CO_(3)-Li_(2)CO_(3)-LiF was designed and investigated for concentrated solar power(CSP).The FactSage software was used to predict the composition and eutectic point of Na_(2)CO_(3)-Li_(2)CO_(3)-LiF.The microstructure,thermophysical properties,and thermal stability of eutectic salts were experimentally measured using various analytical methods.With a mass ratio of 57%:32%:11%,the eutectic salt exhibited excellent thermal storage properties with a fusion enthalpy of 413 J/g and a melting point of 426.8℃.The excellent thermal stability of the eutectic salt was reflected by a weight loss of only 0.8% at 600℃.展开更多
In this paper,a non-contact method based on Raman spectroscopy was used to measure the thermal conductivity of an individual single-walled carbon nanotube(SWCNT)and a multi-walled carbon nanotube(MWCNT).The effect of ...In this paper,a non-contact method based on Raman spectroscopy was used to measure the thermal conductivity of an individual single-walled carbon nanotube(SWCNT)and a multi-walled carbon nanotube(MWCNT).The effect of laser-induced heating on carbon nanotubes(CNTs)was considered.The local temperatures along the longitudinal direction of carbon nanotube were determined by Raman shift,combined with one-dimensional heat conduction model,and the thermal conductivity was finally obtained.The thermal conductivity of the SWCNT with a length of 25μm and a diameter of 1.34 nm decreases as the temperature increases in the measuring temperature range(316 K–378 K).The corresponding thermal conductivities change from 1651 W/(m·K)to 2423 W/(m·K);the thermal conductivities of the MWCNT with 40μm length and 9.2 nm diameter are within 1109–1700 W/(m·K)at 316 K–445 K.To further analyze the size effect on the thermal conductivity,molecular dynamics simulation has been carried out.The result shows that the thermal conductivity of an individual carbon nanotube increases with increasing nanotube length and eventually converges.This work is expected to provide some reference data for the studies of thermal properties of individual CNTs.展开更多
基金the funding support from the National Key Research and Development Plan of China (2018YFA0702300)National Natural Science Foundation of China (NSFC 2151802156)+3 种基金Natural Science Foundation of Jiangsu Province (BK20181302)the Fundamental Research Funds for the Central Universities (30920041107)UK Engineering and Physical Sciences Research Council (EPSRC) for partial support to this project (Grants EP/T022981/1,EP/S032622/1 and EP/P003435/1)the British Council (2020-RLWK12-10478 and 2019-RLWK11-10724)。
文摘In this paper,a novel ternary eutectic salt Na_(2)CO_(3)-Li_(2)CO_(3)-LiF was designed and investigated for concentrated solar power(CSP).The FactSage software was used to predict the composition and eutectic point of Na_(2)CO_(3)-Li_(2)CO_(3)-LiF.The microstructure,thermophysical properties,and thermal stability of eutectic salts were experimentally measured using various analytical methods.With a mass ratio of 57%:32%:11%,the eutectic salt exhibited excellent thermal storage properties with a fusion enthalpy of 413 J/g and a melting point of 426.8℃.The excellent thermal stability of the eutectic salt was reflected by a weight loss of only 0.8% at 600℃.
基金the Beijing Natural Science Foundation(No.3192022)National Natural Science Foundation of China(No.51876007 and No.52176054)。
文摘In this paper,a non-contact method based on Raman spectroscopy was used to measure the thermal conductivity of an individual single-walled carbon nanotube(SWCNT)and a multi-walled carbon nanotube(MWCNT).The effect of laser-induced heating on carbon nanotubes(CNTs)was considered.The local temperatures along the longitudinal direction of carbon nanotube were determined by Raman shift,combined with one-dimensional heat conduction model,and the thermal conductivity was finally obtained.The thermal conductivity of the SWCNT with a length of 25μm and a diameter of 1.34 nm decreases as the temperature increases in the measuring temperature range(316 K–378 K).The corresponding thermal conductivities change from 1651 W/(m·K)to 2423 W/(m·K);the thermal conductivities of the MWCNT with 40μm length and 9.2 nm diameter are within 1109–1700 W/(m·K)at 316 K–445 K.To further analyze the size effect on the thermal conductivity,molecular dynamics simulation has been carried out.The result shows that the thermal conductivity of an individual carbon nanotube increases with increasing nanotube length and eventually converges.This work is expected to provide some reference data for the studies of thermal properties of individual CNTs.
