水煤浆管道输送的阻力预测数学模型

MATHEMATICAL MODEL FOR PREDICTION OF PRESSURE DROP IN CWS TRANSPORTATION PIPELINE

建立了水煤浆管内层流流动的阻力损失模型、层流向紊流过渡的判断标准模型及紊流阻力损失模型.实验结果及现场采集的数据证明了模型的可靠性,由模型的求解结果作出的水煤浆流动的范宁摩擦阻力系数-赫斯特罗姆准数-宾汉雷诺数关系图可用于指导工程设计的需要.

The theology,thixotropy and pipeline transportation characteristics of CWS (coal-water slurry)are taken into account in the study of energy loss in CWS transportation pipeline with reasonable assumptions based on the rheological experimental results,and math- ematical models are estabished to predict the pressure drop in CWS pipeline transportation both in laminar and turbulent flow,which are given below {τ=τ_0+μ_0γ+S_(eq)(τ_1+γ)(ds)/(dt)=k_1(1-S)-K_2(τ_1+μ_1γ)γS^2 f^4/(16)-f^3((He)/(6Reb^2)+1/(Reb)))+(He^4)/(3Reb^8)=0 γ=((32Q)/(πD^3)((1+3n)/(4n))) In addition,the laminar-turbulent transition criterion for CWS pipeline flow is proposed.The models are proved to be reliable through experiments and industrial application.By solving the models,the flow drag of CWS pipeline transportation is predicted and the f-He-Reb relation diagram is drawn,which turns out to be a convenient and useful guide to the design of CWS transportation system.