Using a Modified Turian–Yuan Model to Enhance Heterogeneous Resistance in Municipal Sludge Transportation Pipeline

[Image: see text] Based on the Turian–Yuan heterogeneous resistance model, the simulation results of three urban sludge pipelines with a volumetric concentration of 2.38, 3.94, and 5.39% were analyzed. The reasons for the large deviation of the simulation results under high Reynolds number conditions were also analyzed. The results showed that the deviation of the simulation was mainly caused by the difference between the sludge volumetric concentration (C(V)), the settlement resistance coefficient (C(D)), and the values of the two parameters in the Turian–Yuan heterogeneous resistance model. Consequently, it was necessary to optimize the index m(1) of C(V) and the index m(2) of C(D). Taking mean square deviation as the objective function, using Matlab programming, the abovementioned two indexes were optimized by the simulated annealing algorithm. The optimized index m(1) of C(V) was 0.887, and the index m(2) of C(D) was −0.162. Hence, a modified Turian–Yuan heterogeneous resistance model was obtained. The model verified that the minimum value of the regression coefficient, R(2), of the simulated value reached 0.9701, proving that, the model can be used to simulate the heterogeneous resistance of urban sludge pipeline transportation.