New experimental density and viscosity measurements of squalane (C₃₀H₆₂; 2,6,10,15,19,23-hexamethyltetracosane) have been carried out in the temperature range of 283–353 K and pressures up to 40 MPa for density and 303–333 K and pressures up to 20 MPa for viscosity. The viscosity was measured with an improved capillary technique that avoids calibration at high pressures, which results in better accuracy in the case of capillary techniques. The new data and the data currently available in the open literature were used to develop new density and viscosity reference models. A previously published Tait density reference equation of state (EoS) has been reviewed, upgraded with the most recent data, and extended in the temperature range. Additionally, a friction theory viscosity model has been coupled to the reviewed Tait EoS. Both the density and viscosity models are reliable in the 280–550 K temperature range and pressures up to 400 MPa. The models’ accuracy is better than 0.2% for density and between 2 and 3% for viscosity in the full range of temperature and pressure. For pressures up to 200 MPa, the viscosity model is expected to deliver an overall accuracy of 2% and can be reliably extrapolated up to 400 MPa, about twice the validated pressure range of the Tait EoS. The model is intended for viscosity calibration of high-pressure industrial equipment for dense fluids, such as reservoir fluids at deep-water conditions.

中文翻译：

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角鲨烷的补充实验数据和扩展的密度和粘度参考模型

角鲨烷的新实验密度和粘度测量值（C ₃₀ H ₆₂; 2,6,10,15,19,23-六甲基四烷）已在283–353 K的温度范围内进行，密度最高压力为40 MPa，粘度在303–333 K压力下最高粘度为20 MPa。粘度是通过改进的毛细管技术进行测量的，该技术避免了在高压下进行校准，因此在使用毛细管技术的情况下，精度更高。新数据和公开文献中当前可用的数据用于开发新的密度和粘度参考模型。审查了以前发布的Tait密度参考状态方程（EoS），使用最新数据进行了升级，并扩展了温度范围。此外，已将摩擦理论粘度模型与已审查的Tait EoS耦合。密度和粘度模型在280–550 K的温度范围和最高400 MPa的压力下都是可靠的。在整个温度和压力范围内，该模型的密度精度优于0.2％，粘度精度介于2％和3％之间。对于最高200 MPa的压力，粘度模型预计可提供2％的总体精度，并且可以可靠地推断出最高400 MPa的粘度，约为Tait EoS验证压力范围的两倍。该模型适用于高压工业设备的稠度流体（例如深水条件下的储层流体）的粘度校准。粘度模型预计可提供2％的整体精度，并且可以可靠地推断出最高400 MPa的压力，约为Tait EoS验证压力范围的两倍。该模型适用于高压工业设备的稠度流体（例如深水条件下的储层流体）的粘度校准。粘度模型预计可提供2％的整体精度，并且可以可靠地推断出最高400 MPa的压力，约为Tait EoS验证压力范围的两倍。该模型适用于高压工业设备的稠度流体（例如深水条件下的储层流体）的粘度校准。