Influence of the variation of the flow pattern and the flow state of the waxy hot oil by pipeline transportation on the design calculation of pipeline transportation

Usually,the design calculation of waxy hot oil pipeline transportation is based on common simplified calculation method-average oil temperature method.But in this method,the effect of different flow patterns is not considered,and therefore there is greater error in the calculated results.However,the effect should be considered in accurate calculation.For this reason,the mathematical models for calculating temperature drop and pressure drop are established,and different friction formulas are used for different flow patterns.The calculation result for an example shows that the calculation results obtained using the method are more accurate than those obtained using average oil temperature method.Therefore the effect of flow pattern should be considered in the design calculation of waxy hot oil pipeline transportation.