A review on methods used to reduce drag of the ship hulls to improve hydrodynamic characteristics

Kumar, Susheel; Verma, Kumari Ambe; Pandey, Krishna Murari; Sharma, K. K.

doi:10.1504/ijhm.2020.112198

Cited by 7 publications

(1 citation statement)

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“…Madavan's research finally provided a significant step that opened the study and its application to lubricate ships' surfaces. The most significant reduction in drag on a ship recorded is a reduction of 80% of the skin friction generated by a ship, and this can be seen in several similar studies Hayder et al, [6], Mohammad and Majid, [7], and Sindagi et al, [8]. However, the application has its problems within the location of the injector pad on the surface that should have the highest effect.…”

Section: Introductionmentioning

confidence: 76%

Comparison of Drag Reduction Effect on Barge Model Ship Using Ultrafine Bubble and Microbubble Injection

Gunawan

Utomo

Yanuar

2022

ARFMTS

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nergy efficiency is a global goal in the fight against global warming. Research on reducing drag is one of the ways to improve energy efficiency. The research method used is the injection of micro-sized bubbles and ultra-fine bubbles used in the barge ship model. Microbubble Drag Reduction (MBDR) and Ultrafine Bubble Drag Reduction (UFBDR) are two methods that can play an essential role in reducing drag on the surface of the ship's hull. Factors that can affect the effectiveness of these methods are the injection ratio, location, and coefficient of drag produced by both methods. The injection method discussed the use of the method, which was reviewed on a 2-meter towing tank and compared the two injection methods. The results provided by this research are to determine the injection ratio and the optimum injection location on the model ship and compare the effect of reducing drag and drag coefficient. The increases total resistance reduction of 6.87% compared to the reduction in resistance by microbubble injection.

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Section: Introductionmentioning

confidence: 76%

Comparison of Drag Reduction Effect on Barge Model Ship Using Ultrafine Bubble and Microbubble Injection

Gunawan

Utomo

Yanuar

2022

ARFMTS

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Numerical prediction of breakup mode of contracting gas filament in liquid

Cheng

Zhang

et al. 2021

Numerical Methods in Fluids

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The breaking up of gas filament in liquid is important in many industrial and scientific applications. In this study, a transient axisymmetric model with the level set method is built up to examine the dynamics of a contracting gas filament, and to determine the effects of the aspect ratio, Ohnesorge (Oh) number, and viscosity ratio on its breakup mode. The filament undergoes no break, middle break, or end-pinching modes with increasing aspect ratio at either a low or a high Oh number, and one critical initial aspect ratio is observed for each Oh number.The fate of the filament is determined by the interaction of capillary waves on its surface, and can be predicted accurately by using the one-dimensional wave superposition method. The decreasing viscosity ratio of liquid over gas reduces the critical initial aspect ratio for the fate transition between the no break and breakup modes, and this effect is reduced at a low viscosity ratio. These findings may be helpful in fabricating gas bubbles and their breakup suppression.

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The role of sawtooth-shaped nano riblets on nanobubble dynamics and collapse-induced erosion near solid boundary

Rezaee,

Kadivar,

el Moctar

2024

Journal of Molecular Liquids

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A review on methods used to reduce drag of the ship hulls to improve hydrodynamic characteristics

Cited by 7 publications

References 0 publications

Comparison of Drag Reduction Effect on Barge Model Ship Using Ultrafine Bubble and Microbubble Injection

Comparison of Drag Reduction Effect on Barge Model Ship Using Ultrafine Bubble and Microbubble Injection

Numerical prediction of breakup mode of contracting gas filament in liquid

The role of sawtooth-shaped nano riblets on nanobubble dynamics and collapse-induced erosion near solid boundary

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