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Ocean Systems Engineering
  Volume 9, Number 4, December 2019 , pages 409-422
DOI: https://doi.org/10.12989/ose.2019.9.4.409
 

Sloshing suppression by floating baffle
Hooi-Siang Kang, Ummul Ghafir Md Arif, Kyung-Sung Kim, Moo-Hyun Kim, Yu-Jie Liu, Kee-Quen Lee and Yun-Ta Wu

 
Abstract
    Sloshing is a phenomenon which may lead to dynamic stability and damages on the local structure of the tank. Hence, several anti-sloshing devices are introduced in order to reduce the impact pressure and free surface elevation of liquid. A fixed baffle is the most prevailing anti-sloshing mechanism compared to the other methods. However, the additional of the baffle as the internal structure of the LNG tank can lead to frequent damages in long-term usage as this structure absorbs the sloshing loads and thus increases the maintenance cost and downtime. In this paper, a novel type of floating baffle is proposed to suppress the sloshing effect in LNG tank without the need for reconstructing the tank. The sloshing phenomenon in a membrane type LNG tank model was excited under sway motion with 30% and 50% filling condition in the model test. A regular motion by a linear actuator was applied to the tank model at different amplitudes and constant period at 1.1 seconds. Three pressure sensors were installed on the tank wall to measure the impact pressure, and a high-speed camera was utilized to record the sloshing motion. The floater baffle was modeled on the basis of uniform-discretization of domain and tested based on parametric variations. Data of pressure sensors were collected for cases without- and with-floating baffle. The results indicated successful reduction of surface run-up and impulsive pressure by using a floating baffle. The findings are expected to bring significant impacts towards safer sea transportation of LNG.
 
Key Words
    sloshing; floating baffle; membrane tank; LNG
 
Address
Hooi-Siang Kang: Marine Technology Centre, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia;
School of Mechanical Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia
Ummul Ghafir Md Arif: School of Mechanical Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia
Kyung-Sung Kim: School of Naval Architecture and Ocean Engineering, Tongmyong University, Busan, Republic of Korea
Moo-Hyun Kim and Yu-Jie Liu: Department of Ocean Engineering, Texas A&M University, College Station, Texas, USA
Kee-Quen Lee: Department of Mechanical Precision Engineering, Malaysia-Japan International Institute of Technology,
Kuala Lumpur, Malaysia
Yun-Ta Wu: Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan, Taiwan (R.O.C)

 

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