Sealed Gravitational Capillary Viscometry of Dimethyl Ether and Two Next-Generation Alternative Refrigerants.
Sealed Gravitational Capillary Viscometry of Dimethyl Ether and Two Next-Generation Alternative Refrigerants.
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DOI：
10.6028/jres.117.014
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发表时间：
2012
影响因子：
1.5
通讯作者：
Laesecke A
中科院分区：
文献类型：
--
作者：
Cousins DS;Laesecke A
测定了二甲醚(DME，C2H6O)、含氟丙烯异构体2，3，3，3-四氟丙烯-1-烯(R1234yf，C3H2F4)和反式-1，3，3，3，3-四氟丙烯(R1234ze(E))在242~350K饱和液体条件下的粘度。该仪器是NIST开发的一种用于挥发性液体的密封式重力毛细管粘度计。用正戊烷对仪器常数进行了校准和调整。测量的重复性约为1.5%，导致实验数据的随温度变化的综合标准不确定度介于242K时的5.7%和340K时的2.6%之间。用从头算方法计算了被测化合物的分子大小、形状和电荷分布，补充了测量结果。将二甲醚的粘度计算结果与文献数据进行了比较。用密封式毛细管粘度计测量的另一组数据比目前的结果高出7%，可以通过应用蒸汽浮力校正来协调。然后，所有数据都在目前结果的估计不确定度范围内一致。含氟丙烯异构体的粘度与NIST扩展对应态模型预测值的偏差高达4%。这两种异构体的粘度不随其偶极矩而变化。而R1234ze(E)的测量粘度与R134a相近，而被替代制冷剂R1234yf的粘度比R1234yf低25%。比较了二甲醚与水、甲醇的粘度。
The viscosities of dimethyl ether (DME, C2H6O) and of the fluorinated propene isomers 2,3,3,3-tetrafluoroprop-1-ene (R1234yf, C3H2F4) and trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) were measured in a combined temperature range from 242 K to 350 K at saturated liquid conditions. The instrument was a sealed gravitational capillary viscometer developed at NIST for volatile liquids. Calibration and adjustment of the instrument constant were conducted with n-pentane. The repeatability of the measurements was found to be approximately 1.5 %, leading to a temperature-dependent estimated combined standard uncertainty of the experimental data between 5.7 % at 242 K for dimethyl ether and 2.6 % at 340 K for R1234yf. The measurements were supplemented by ab initio calculations of the molecular size, shape, and charge distributions of the measured compounds. The viscosity results for dimethyl ether were compared with literature data. One other data set measured with a sealed capillary viscometer and exceeding the present results by up to 7 % could be reconciled by applying the vapor buoyancy correction. Then, all data agreed within the estimated uncertainty of the present results. Viscosities for the fluorinated propene isomers deviate up to 4 % from values predicted with the NIST extended corresponding-states model. The viscosities of the two isomers do not scale with their dipole moments. While the measured viscosity of R1234ze(E) with the lower dipole moment is close to that of R134a, the refrigerant to be replaced, that of R1234yf with the higher dipole moment is up to 25 % lower. The viscosity of dimethyl ether is compared with those of water and methanol.
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影响因子：
3.9
作者：
Calm, James M.
通讯作者：
Calm, James M.
影响因子：
2.2
作者：
Kumagai, A;Yokoyama, C
通讯作者：
Yokoyama, C
影响因子：
--
作者：
Edwards, DA;Bonilla, CF
通讯作者：
Bonilla, CF
DOI：
10.1021/je00019a026
发表时间：
1995-05-01
期刊：
JOURNAL OF CHEMICAL AND ENGINEERING DATA
影响因子：
--
作者：
HAN, LZ;ZHU, MS;LUO, D
通讯作者：
LUO, D
影响因子：
2.2
作者：
Laesecke, A;L端ddecke, TOD;Morris, DJ
通讯作者：
Morris, DJ