Browsing by Author "Sannasiraj, S.A."

Now showing 1 - 5 of 5

Effect of porous baffle on sloshing pressure distribution in a barge mounted container subjected to regular wave excitation
(Department of Naval Architecture and Marine Engineering mmkarim@name.buet.ac.bd, 2020) Nasar, T.; Sannasiraj, S.A.; Sundar, V.
An experimental study has been carried out to assess the sloshing pressure expected on the side walls of the tank and on top panel. A liquid fill level with an aspect ratio (hs /l, where hs is the static liquid depth and l is the tank length) of 0.488 is considered which corresponds to 75% liquid fill level. In view of suppressing sloshing oscillation and consequent sloshing pressure, the baffle wall configurations such as porous wall at l/2 and porous walls at l/3 and 2l/3 were adopted. Three porosities of 15%, 20.2%, and 25.2% were considered. The sloshing tank is fitted into the freely floating barge of model scale 1:43. The barge is kept inside the wave flume in the beam sea conditions. The effects of wave excitation frequencies and on the sloshing pressure variation have been studied in detail. For comparison purpose, solid wall placed at l/2 (Nasar and Sannasiraj, 2018) is also considered and, the salient results are herein reported. © Department of Naval Architecture and Marine Engineering. All rights reserved.
Experimental investigation on effect of submerged solid baffle in a barge carrying liquid sloshing tank
(Springer, 2019) Nasar, T.; Sannasiraj, S.A.
An experimental programme is conducted to investigate, barge responses, sloshing dynamics and sloshing pressure in a partially liquid-filled baffled tank which is equipped in a floating barge. The barge was subjected to regular wave excitations with wave height of 0.1m and frequencies ranging from 0.45 to 1.54Hz under beam sea condition. An aspect ratio (hs/l, liquid depth, hs to length of tank l) of 0.488 corresponds to 75% fill level is considered. In addition, a solid baffle wall at l/2 (height of solid baffle wall as h/2, h = tank height) is considered which is a typical arrangement in LNG sloshing tank. The effectiveness of solid baffle is investigated in comparison with unbaffled conditions. The barge responses at liquid-filled condition and equivalent dry weight conditions are compared. © Springer Nature Singapore Pte Ltd. 2019.
Performance assessment of porous baffle on liquid sloshing dynamics in a barge carrying liquid tank
(Taylor and Francis Ltd., 2021) Nasar, T.; Sannasiraj, S.A.; Sundar, V.
A comprehensive experimental work is done to investigate sloshing dynamics in a partially liquid-filled baffled tank, equipped with a floating barge. An aspect ratio(hs /l, liquid depth, hs to length of tank, l) of 0.488 (above critical fill level), which corresponds to 75% fill level, is considered. The barge was subjected to regular wave excitations with a wave height of 0.1 m and frequencies ranging from 0.45Hz to 1.54Hz under beam sea condition. In addition, porous baffles are placed inside a rectangular tank to study its effectiveness in reducing the sloshing energy. Three different porosities of 15%, 20.2% and 25.2% at l/2 are considered. The effectiveness of baffles is explored and the salient results for a single porous baffle are discussed. It is learnt that the effect of baffles on sway and roll responses is significant, whereas it is insignificant on heave. Porous baffles are effective in suppressing the sloshing oscillation in the vicinity or at wave excitation, fw =f 1, whereas the sloshing is amplified at fw =f 2 and fw =f 3 due to the resonance condition of modified natural frequencies. © 2020 Informa UK Limited, trading as Taylor & Francis Group.
Sloshing dynamics and performance of porous baffle arrangements in a barge carrying liquid tank
(2019) Nasar, T.; Sannasiraj, S.A.
An experimental investigation is conducted to explore the effectiveness of porous baffles placed at l/3 and 2l/3 in the sloshing tank. A tank aspect ratio, hs/l of 0.488 which corresponds to 75% filled condition is considered. The sloshing tank is kept inside the freely floating barge and subjected to regular beam sea waves. A wave height of 0.1 m and excitation frequencies ranging from 0.45 Hz to 1.54 Hz is adopted. Baffles with three different porosities of 15%, 20.2% and 25.2% are used. The effectiveness of baffles placed at l/3 and 2l/3 is explored on comparison with the performance of single porous baffle kept at l/2 and a solid submerged baffle place at l/2. Sloshing dynamics for the baffles placed at l/3 and 2l/3 and barge responses are also discussed. 2019 Elsevier Ltd
Sloshing dynamics and performance of porous baffle arrangements in a barge carrying liquid tank
(Elsevier Ltd, 2019) Nasar, T.; Sannasiraj, S.A.
An experimental investigation is conducted to explore the effectiveness of porous baffles placed at l/3 and 2l/3 in the sloshing tank. A tank aspect ratio, hs/l of 0.488 which corresponds to 75% filled condition is considered. The sloshing tank is kept inside the freely floating barge and subjected to regular beam sea waves. A wave height of 0.1 m and excitation frequencies ranging from 0.45 Hz to 1.54 Hz is adopted. Baffles with three different porosities of 15%, 20.2% and 25.2% are used. The effectiveness of baffles placed at l/3 and 2l/3 is explored on comparison with the performance of single porous baffle kept at l/2 and a solid submerged baffle place at l/2. Sloshing dynamics for the baffles placed at l/3 and 2l/3 and barge responses are also discussed. © 2019 Elsevier Ltd