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Truss-type maintenance devices and corresponding pipeline lifting control strategies

Petroleum Science 2021年第3期18卷 939-950页

作者： Tian-Feng Zhao Qing-Yuan Zhang Gui chu college of Safety and Ocean Engineering China University of Petroleum-BeijingBeijing 102249China china Huanqiu contracting and Engineering(Beijing)cO. Ltd.Beijing 100012China

For new submarine pipeline maintenance lifting equipment,a specialized analysis model is constructed in this study.A pipeline can be divided into the lifted portion and the touch-down portion that lies on the seabed,and each of these portions can be analyzed separately by converting the continuity conditions at the touch-down points to boundary *** typical two-point sequence secant iterative technique is used to obtain the unknown lifted length and determine pipeline lifting *** bvp4c module in MATLAB software is used to solve this multiple-point boundary value problem issued from frst-order diferential ***,the triple-point lifting mode of truncated maintenance and the two-point lifting mode of online maintenance are *** the lifted heights at truss positions are shown,the lifting deformation,lifting forces,bending moment distribution,and axial force distribution can be analyzed using a dedicated analysis *** results can then be used to design a lifting strategy to protect the pipeline.

关键词： Pipeline lifting Multiple-point boundary value Shooting method coulomb friction bvp4c module

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computational Investigation of Brownian Motion and Thermophoresis Effect on Blood-Based casson Nanofluid on a Non-linearly Stretching Sheet with Ohmic and Viscous Dissipation Effects

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computer Modeling in Engineering & Sciences 2024年第11期141卷 1137-1163页

作者： Haris Alam Zuberi Madan Lal Shivangi Verma Nurul Amira Zainal Department of Applied Mathematics M.J.P.Rohilkhand UniversityBareilly243006Uttar PradeshIndia Fakulti Teknologi dan Kejuruteraan Mekanikal Universiti Teknikal MalaysiaMelakaDurian Tunggal76100Malaysia Forecasting and Engineering Technology Analysis(FETA)Research Group Universiti Teknikal MalaysiaMelakaDurian Tunggal76100Malaysia

Motivated by the widespread applications of nanofluids,a nanofluid model is proposed which focuses on uniform magnetohydrodynamic(MHD)boundary layer flow over a non-linear stretching sheet,incorporating the casson model for blood-based nanofluid while accounting for viscous and Ohmic dissipation effects under the cases of constant Surface Temperature(cST)and Prescribed Surface Temperature(PST).The study employs a two-phase model for the nanofluid,coupled with thermophoresis and Brownian motion,to analyze the effects of key fluid parameters such as thermophoresis,Brownian motion,slip velocity,Schmidt number,Eckert number,magnetic parameter,and non-linear stretching parameter on the velocity,concentration,and temperature profiles of the *** proposed model is novel as it simultaneously considers the impact of thermophoresis and Brownian motion,along with Ohmic and viscous dissipation effects,in both cST and PST scenarios for blood-based casson *** numerical technique built into MATLAB’s bvp4c module is utilized to solve the governing system of coupled differential equations,revealing that the concentration of nanoparticles decreases with increasing thermophoresis and Brownian motion parameters while the temperature of the nanofluid ***,a higher Eckert number is found to reduce the nanofluid temperature.A comparative analysis between cST and PST scenarios is also undertaken,which highlights the significant influence of these factors on the fluid’s *** findings have potential applications in biomedical processes to enhance fluid velocity and heat transfer rates,ultimately improving patient outcomes.

关键词： Brownian motion boundary layer flow thermophoresis bvp4c module viscous dissipation ohmic dissipation partial slip

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