Effect of the drag coefficient on the performance of vertical porous baffles in a sloshing tank
Journal of Engineering, Design and Technology
ISSN: 1726-0531
Article publication date: 23 October 2023
Abstract
Purpose
The present work involves analytical and experimental investigation of sloshing in a two-dimensional rectangular tank including the effect of porous baffles to control and/or reduce the wave motion in the sloshing tank. The purpose of this study is to assess the analytical solutions of the drag coefficient effect on porous baffles performance to track free surface motion variation in the sloshing tank by comparison with experimental shake table tests under a range of sway excitation.
Design/methodology/approach
The linear second-order ordinary differential equations for liquid sloshing in the rectangular tank were solved using Newmark’s beta method and obtained the analytical solutions for liquid sloshing with dual vertical porous baffles of full submergence depths in a sway-oscillated rectangular tank following the methodology similar to Warnitchai and Pinkaew (1998) and Tait (2008).
Findings
The porous baffles significantly reduce wave elevation in the varying filled levels of the tank compared to the baffle-free tank under the range of excitation frequencies. It is observed that the Reynolds number-dependent drag coefficient for porous baffles in the tank can significantly reduce the sloshing elevations and is found to be effective to achieve higher damping compared to the porosity-dependent drag coefficient for porous baffles in the sloshing tank. The analytical model’s response to free surface elevation variations in the sloshing tank was compared with the experiment’s test results. The analytical results matched with shake table test results with a quantitative difference near the first resonant frequency.
Research limitations/implications
The scope of the study is limited to porous baffles performance under range sway motion and three different filling levels in the tank. The porous baffle performance includes Reynolds number dependent drag coefficient to explore the damping effect in the sloshing tank.
Originality/value
The porous baffles with low-level porosities in the sloshing tank have many engineering applications where the first resonant mode of sloshing in the tank is more important. The porous baffle drag coefficient is an important parameter to study the baffle’s damping effect in sloshing tanks. Hence, obtained analytical solution for liquid sloshing in the rectangular tank with Reynolds number as well as porosity-dependent drag coefficient (model 1) and porosity-dependent drag coefficient porous baffles (model 2) performance is discussed. The model’s test results were validated using a series of shake table sloshing experiments for three fill levels in the tank with sway motion at various excitation frequencies covering the first four sloshing resonant modes.
Keywords
Acknowledgements
The authors would like to thank the SERB-DST and NITK, Surathkal for providing laboratory facilities. The authors thank Ms Shwetha Shree, Mr Sreenivasulu and Mr Keshav for their help in conducting the experiments.
Declarations: The authors declare that they have no conflict of interest.
Since acceptance of this article, the following author(s) have updated their affiliations: Mallikarjun S. Bhandiwad is at the Department of Civil Engineering, SDM College of Engineering and Technology, Dharwad, India.
Citation
Bhandiwad, M.S., Dodamani, B.M. and M.D., D. (2023), "Effect of the drag coefficient on the performance of vertical porous baffles in a sloshing tank", Journal of Engineering, Design and Technology, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/JEDT-01-2023-0021
Publisher
:Emerald Publishing Limited
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