Abstract
In this chapter, improved lumped parameter models are applied for transient thermal analysis of multilayered composite pipeline with active heating, which is essential for flow assurance design and operating strategies of deepwater subsea pipelines. Improved lumped models for transient heat conduction in multilayered composite pipelines are based on two-points Hermite approximations for integrals. The transient energy equation for the bulk temperature of the produced fluid is transformed into a set of ordinary differential equations in time by using a finite difference method. The coupled system of ordinary differential equations for average temperatures in the solids and bulk temperature of the fluid at each longitudinal discretization point along the pipeline is solved by using an ODE solver. With the proposed method, we analyzed the transient heat transfer in stainless steel–polypropylene–stainless steel sandwich pipes (SP) with active electrical heating. Convergence behaviors of the average temperature of each layer and the bulk temperature of the produced fluid calculated by using the improved lumped models (H 0,0∕H 1,1 and H 0,0∕H 1,1 approximations) against the number of grid points along the pipelines were presented. Case studies were performed to investigate the effect of the linear rate of power input and the average velocity on the bulk temperature distribution of the produced fluid.
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An, C., Duan, M., Estefen, S.F., Su, J. (2021). Transient Analysis of Multilayer Composite Pipelines with Active Heating. In: Structural and Thermal Analyses of Deepwater Pipes . Springer, Cham. https://doi.org/10.1007/978-3-030-53540-7_16
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DOI: https://doi.org/10.1007/978-3-030-53540-7_16
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