一、问题的提出当输油管道，化工物料输送管道以及化学纤维工业的原液管道中物料的凝固点高于周围的环境温度时，由于管道向外界的散热在连续流动中物料的温度不断下降，而导致凝固，造成管道堵塞。有些高粘度物料随管道温度下降，粘度迅速增加，导致输送压力损失增加，使流速? First, the issue put forward When the oil pipeline, chemical material pipelines and chemical fiber industry liquid pipeline raw material freezing point higher than the ambient temperature, due to the pipeline to the outside heat in a continuous flow of material temperature continues to decline, which led to Solidification, resulting in pipeline blockage. Some high-viscosity materials with the pipe temperature decreases, the viscosity increases rapidly, resulting in increased transport pressure loss, so that the flow rate?