定义：聚合物熔体在管道入口端因出现收敛流动，使压力降突然增大的现象。
作者认为传质速度的增加是由于入口效应所引起的。
This increase in the mass transfer rate is thought to be due to the existence of an entrance effect.
提出了一种考虑轴向热传导、速度滑移、温度跳跃和入口效应情况下圆形微通道能量方程的求解方法。
A method for resolving the energy equation of the circular microchannel, which considers axial heat conduction, temperature jump, velocity slip and thermal entrance is presented.
结果表明，不同角度圆锥口模挤出过程中，熔体在收敛流道受到拉伸流变，导致强烈的入口弹性效应，表现出熔体在不同角度圆锥口模挤出时有不同的挤出胀大比。
The results show that the extensional flow of melt in convergent die results in intense entrance elastic effect and distinct extrusion swell in conical die with different angles.
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