Abstract
.Herschel-Bulkley模型（即屈服幂率模型）可用于研究非牛顿流体的流动特性，并能在大范围剪切速率条件下得到准确的预测结果。为此，采用有限体积方法（FVM），研究了内部管柱旋转及流变参数（屈服应力τ0、稠度系数K和流性指数n）对偏心环空（E=0.5）中Herschel-Bulkley流体层流区域的轴向、切向速度剖面与压降梯度的影响。研究结果表明，内部管柱转速从100 r/min增加至400 r/min时，会引起最大轴向速度增加，增幅为120%；较低的流性指数（n=0.2）会引起偏心环空宽区域出现二次流；内部管柱转速及流变参数的变化对偏心环空宽区域切向速度剖面有不良影响；内部管柱转速从0增加至400 r/min时，会引起不同偏心环空（E=0.2, 0.4, 0.6和0.8）内幂率流体压降梯度降低，降低幅度为10%。
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