On the Dynamic Stability of OTEC Cold Water Pipe (CWP) under Variations of Force Balance Descriptions at the Free Inlet

Q2 Environmental Science

Evergreen Pub Date : 2023-09-01 DOI:10.5109/7151716

Ristiyanto Adiputra, None Muhammad Iqbal Habib, Daif Rahuna, Teguh Muttaqie, None Erwandi, None Aditya Rio Prabowo, None Cahyadi Sugeng Jati Mintarso

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引用次数: 0

Abstract

: Ocean Thermal Energy Conversion (OTEC) Cold Water Pipe (CWP) can be addressed as a riser conveying fluid which is predicted to be unstable when the internal velocity exceeds its critical value. However, the numerical analysis shows a momentum change at the free inlet, which may influence the riser stability. Thus, this paper analyzed the stability of OTEC CWP analytically by considering the force balance at the inlet. The modeling of the pipe and the variations in force balance modeling were conducted using the finite element method where the pipe stability behavior was assessed by observing the displacement of the last node of the pipe over time generated via the Newmark time scheme method. The critical velocity on a small-scale fixed joint pipe model, including shear force balance, was 5.06 m/s, while the critical velocity with partial shear force balance and no shear force balance was between 2.3-2.4 m/s. In the full-scale model, the critical velocity with shear force balance was 5 m/s and 4.75 m/s, for fixed joint and pinned joint, respectively. Critical velocity generated by partially and fully excluding shear force balance on the pipe model is 3.66 m/s and 3.68 m/s for the fixed joint and 3.58 and 3.62 for the pinned joint. The results showed that the inclusion of shear force balance increased the critical velocity

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自由入口不同力平衡描述下OTEC冷水管动态稳定性研究

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来源期刊

Evergreen Environmental Science-Management, Monitoring, Policy and Law

CiteScore

4.30

自引率

0.00%

发文量

期刊介绍： “Evergreen - Joint Journal of Novel Carbon Resource Sciences & Green Asia Strategy” is a refereed international open access online journal, serving researchers in academic and research organizations and all practitioners in the science and technology to contribute to the realization of Green Asia where ecology and economic growth coexist. The scope of the journal involves the aspects of science, technology, economic and social science. Namely, Novel Carbon Resource Sciences, Green Asia Strategy, and other fields related to Asian environment should be included in this journal. The journal aims to contribute to resolve or mitigate the global and local problems in Asia by bringing together new ideas and developments. The editors welcome good quality contributions from all over the Asia.