Yuewu PAN
,
Jie YU
,
Zhan HU
,
Hongdong LI
,
Qiliang CUI
,
Guangtian ZOU
,
null
,
null
,
null
材料科学技术（英）
ZnS nano-particles with average sizes of 10 nm and 5 nm were fabricated by sol-gel method, and their pressure-induced phase transformations were in-situ examined in a diamond anvil cell by energy dispersive X-ray diffraction (EDXD) from ambient pressure to 35.0 GPa. From the obtained interplanar spacing data, the volume compression ratios were derived at different pressures, and then the bulk modulus and its pressure derivative were obtained by fitting to the Murnaghan equation. It is found that both ZnS nano-particles initially in the zinc-blende phase transformed to cubic NaCl structure in the presence of pressure and the transition was reversible when the pressure was released. Moreover, it is suggested that a smaller particle size will induce a larger transition pressure.
关键词:
Nano-particles
,
null
,
null
,
null
陈高飞
,
公茂琼
,
邹鑫
,
吴剑峰
,
汪胜
工程热物理学报
对乙烷、丙烷纯质及三种不同浓度比例的乙烷／丙烷二元混合物在内径为8mm的水平管内进行了饱和流动沸腾传热特性的实验研究，重点分析了热流密度、质量流量的变化对二元混合工质传热系数的影响。选用了4种专用于计算混合物流动换热的关联式，并与实验数据进行了比较，其中Gungor—Winterton and Thome关联式和Zou关联式的预测偏差相对较小，且计算过程较为简单，较适合用于该工况范围的混合工质传热预测。
关键词:
流动沸腾
,
乙烷
,
丙烷
,
传热关联式
,
水平管
