Geomechanical impacts of temperature variations and nanoparticle reinforcement on the behavior of fluid-conveying concrete pipes

Jianfeng Li , A. Zamani Nouri , Li Zhang

Abstract

The present research discusses coupled phenomena of temperature fluctuations and nanoparticle addition towards the mechanical properties and operation efficiencies in the pipelines used in membrane water treatment systems. More specifically, it quantifies thermal variability that can cause changes in material properties of pipes, which may increase susceptibility to deformation, stress, and fatigue, perhaps undermining system integrity over time. The study has focused on how material properties subjected to temperature changes can result in degradation and probable structural failure, which impacts performance and reliability in general. This paper discusses the addition of nanoparticles (iron oxide) into the fluid with the aim of improving heat transfer, frictional losses, and improving the durability of the materials of the pipe. With the nanoparticles expected to alleviate critical area wear and thermal stresses, the nanoparticles will enhance the lifetime and reliability of the pipeline under extreme operational conditions. The foreseen outcome will be highly improved stability and efficiency of operation within water treatment systems, especially under adverse temperature and pressure conditions. Results indicate that adding nanoparticles in the percentage range of 3-3.5% increased the dimensionless natural frequency by about 12% and the critical fluid velocity by almost 28%, providing very strong stabilizing effects. Moreover, with a Pasternak elastic foundation, system rigidity is increased by as much as 25%, thereby greatly postponing the onset of dynamic instability.

Key Words

conveying concrete pipes; geomechanics; nanoparticle reinforcement; structural behavior; temperature effects

Address

Jianfeng Li and Li Zhang — College of Civil and Transportation Engineering,Shenzhen University, Shenzhen,518060, China
A. Zamani Nouri — 2Department of Civil Engineering, ShQ. C., Islamic Azad University, Shahr-e-Qods, Iran
Li Zhang — China Railway Hefei Institute of Architectural & Municipal Engineering Design Co., Ltd, Hefei, 230041, China

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