二甲醚热物理性质的研究

Research of Thermophysical Properties of Dimethyl Ether

对二甲醚热物理性质的研究现状进行了详细分析,同时对西安交通大学在二甲醚热物理性质,包括临界参数、饱和气液相密度、饱和蒸气压、标准沸点、偏心因子、气相PVT性质、维里系数、表面张力、饱和液相粘度等方面的研究进展进行总结和分析,提供了相关的计算方程.其中饱和液相和气相密度方程的温度适用范围为301～400K,计算的不确定度小于0 35%和4 83%,饱和蒸气压方程的温度适用范围为233～400K,计算的不确定度小于0 1%,气相PVT方程的适用温度范围为298～353K,计算的不确定度小于0 5%,表面张力方程的适用温度范围为213～368K,计算的不确定度小于0 2mN·m-1,粘度方程的适用温度范围为227～343K,计算的不确定度小于2 0%,为其他研究人员今后从事二甲醚的应用研究提供了急需的基础热物性数据.

Recent investigations of clean alternative fuels have discovered that dimethyl ether and its mixtures have excellent properties as diesel fuels, and have a promising future as a replacement for fuels obtained from fossil reserves. Up to now, the researchers have already made a great progress in dimethyl ether car. Hence, the reliable experimental thermophysical properties data of dimethyl ether are very urgent and indispensable. The research status of dimethyl ether thermophysical properties was summarized, and the research progress made in Xi'an Jiaotong University was reported, including critical parameters, saturated densities, vapor pressure, boiling point, acentric factor, gaseous PVT, virial coefficient, surface tension, and saturated liquid viscosity. The estimated uncertainties of properties calculated using the equations are 0.35% in saturated liquid density and 4.83% in saturated gaseous density at temperature from 301 to 400 K, 0.1% in vapor pressure at temperature from 233 to 400 K, 0.5% in gaseous PVT at temperature from 298 to 353 K and pressure less than 2 MPa, 0.2 mN &middot m-1 in surface tension at temperature from 213 to 368 K, and 2.0% in dynamic viscosity at temperature 227 to 343 K.