Viscosity of Aged Bio-oils from Fast Pyrolysis of Beech Wood and Miscanthus : Shear Rate and Temperature Dependence
Viscosity of Aged Bio-oils from Fast Pyrolysis of Beech Wood and Miscanthus : Shear Rate and Temperature Dependence
复制标题
山毛榉木和芒草快速热解产生的老化生物油的粘度：剪切速率和温度依赖性
DOI：
10.1021/acs.energyfuels.6b00640
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发表时间：
2016
期刊：
影响因子：
5.3
通讯作者：
Cai J
中科院分区：
文献类型：
--
作者：
Cai J
利用旋转粘度计对四种老化生物油样品在不同剪切速率和温度下的粘度进行了实验测量。实验生物油是由山毛榉木材在450、500和550°C以及在500°C下快速热解得到的(在本工作中，它们被命名为BW1、BW2、BW3和MXG)。在相同的温度下，所有生物油的粘度在不同的剪切速率下保持不变，表明它们是牛顿流体。BW1、BW2、BW3和MXG的粘度随温度的升高分别下降90.7%、93.3%、92.6%和90.2%。Arrhenius粘度模型通常被用来描述许多流体粘度随温度的变化关系，但该模型并不能很好地拟合所有生物油的粘温实验数据，特别是在低温和高温区。为了进行比较，还使用了Williams-Landel-Ferry(WLF)模型。结果表明，WLF模型能很好地描述各生物油的粘温关系，且BW3生物油的粘温相关性最强。
The viscosity of four aged bio-oil samples was measured experimentally at various shear rates and temperatures using a rotational viscometer. The experimental bio-oils were derived from fast pyrolysis of beech wood at 450, 500, and 550 °C andMiscanthusat 500 °C (in this work, they were named as BW1, BW2, BW3, and MXG) in a bubbling fluidized bed reactor. The viscosity of all bio-oils was kept constant at various shear rates at the same temperature, which indicated that they were Newtonian fluids. The viscosity of bio-oils was strongly dependent upon the temperature, and with the increase of the temperature from 30 to 80 °C, the viscosity of BW1, BW2, BW3, and MXG decreased by 90.7, 93.3, 92.6, and 90.2%, respectively. The Arrhenius viscosity model, which has been commonly used to represent the temperature dependence of the viscosity of many fluids, did not fit the viscosity–temperature experimental data of all bio-oils very well, especially in the low- and high-temperature regions. For comparison, the Williams–Landel–Ferry (WLF) model was also used. The results showed that the WLF model gave a very good description of the viscosity–temperature relationship of each bio-oil with very small residuals and the BW3 bio-oil had the strongest viscosity–temperature dependence.