Understanding spray cloud formation by wave impact on marine objects

Bodaghkhani, Armin; Dehghani, S. R.; Muzychka, Y. S.; Colbourne, Bruce

doi:10.1016/j.coldregions.2016.06.008

Cited by 38 publications

(9 citation statements)

References 157 publications

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“…The study of larger droplets generation, their trajectories and velocities is relevant for the understanding of phenomena that occurs close to the ocean surface. For example, the main source of marine icing on ships and offshore structures is the sea spray generated by breaking waves and waves impacting in the same structures [1,3]. The present study is an attempt to contribute to the understanding of the large droplets behaviour.…”

Section: Introductionmentioning

confidence: 99%

“…These ice layers represent a life hazard for the inhabitants of these vessels. Field studies and simulations has been used to address this phenomenon [1][2][3][4], but its complexity has shown that a deeper understanding of the droplet generation post-breaking is necessary. The study of droplet size distribution and dynamics is also important to understand the transport through the marine boundary layer and above.…”

Section: Introductionmentioning

confidence: 99%

“…The review closes by highlighting that one of the main issues to study in the future is the production of large spume droplets (radius larger than 1 mm), their generation mechanism, initial velocity and dynamic behaviour through the airflow. Moreover, field studies of droplet distribution on vessels showed that the sizes distributions extend to several millimeters [3,4]. The study of larger droplets generation, their trajectories and velocities is relevant for the understanding of phenomena that occurs close to the ocean surface.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Droplet Generation by Post-Breaking Plunger Waves

Torre¹,

Vollestad²,

Jensen³

2021

Preprint

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Understanding the droplet cloud and spray dynamics is important on the study of the ocean surface and marine boundary layer. The role that the wave energy and the type of wave breaking plays in the resulting distribution and dynamics of droplets is yet to be understood. The aim of this work was to generate violent plunging breakers in the laboratory and analyze the spray production post-breaking, i.e. after the crest of the wave impacts in the free surface. The droplet sizes and their dynamics were measured and the effect of different wind speeds on the droplet production was also considered. It was found that the mean radius increases with the wave energy and the presence of larger droplets (radius > 2 mm) in the vertical direction increases with the presence of wind. Furthermore, the normalized distribution of droplet sizes is consistent with the distribution of ligament-mediated spray formation. Also, indications of turbulence affecting the droplet dynamics at wind speeds of 5 ms -1 were found. The amount of large droplets (radius > 1 mm) found in this work was larger than reported in the literature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Droplet Generation by Post-Breaking Plunger Waves

Torre¹,

Vollestad²,

Jensen³

2021

Preprint

View full text Add to dashboard Cite

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“…A large range of two phase flow interactions generate aerosols in the oceanic surface. Between this phenomena, wave breaking is a very important source of aerosol and it is also considered the main source to marine icing (Rashid et al, 2016;Dehghani et al, 2016b;Bodaghkhani et al, 2016), which is the main focus of this work. Marine icing is produced in polar regions, when the droplets produced after wave breaking are transported by the wind and generate thick layers of ice over the surface of ships and structures; these ice-layers represent a life hazard.…”

Section: Introductionmentioning

confidence: 99%

“…The jet formation at wave impact and jet break-up into droplets have been less studied because of its complexity. It is common to consider a simplification of the phenomenon by comparing with a planar jet coming out of a nozzle (Lozano et al, 1998;Sarchami et al, 2010;Bodaghkhani et al, 2016) and we can find both numerical and experimental approaches. Only few studies have conducted experimental work on the break up of waves impacting on a vertical wall and proposed an explanation of the instabilities that create the spray formation Ingram, 2015, 2016).…”

Section: Introductionmentioning

confidence: 99%

3D Particle Tracking Velocimetry applied to droplets generated by breaking waves

Torre¹,

Jensen²

2021

ISPIV21

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One of the environmental difficulties of exploring the polar regions is marine icing. The understanding of this phenomenon is important for the safety of installations, ships and people that operates in these environments. One of the main sources of marine icing is wave breaking. Therefore, experimental and field work has been conducted to understand the break-up of waves in different situations and some explanation have been proposed to the instabilities that create the spray formation. In this work, two different situations of wave breaking were studied: 1. Solitary waves were created and steepened by the use of a beach. The waves impacted on a vertical wall with different wall heights. 2. Violent plunging breakers were created by a focusing wave train and a sloping beach. The main objective of these experiments was to quantify the production of droplets from the impact by using Particle Tracking Velocimetry in 3 dimensions. It was found that the initial distribution of droplet sizes is similar in both experiments. These distributions are compared with previous studies, where the distribution of droplet sizes in different experimental cases were approximated by lognormal, Weibull or G-distributions respectively.

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Transient heat conduction through a substrate of brine-spongy ice

2017

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This paper develops a new predictive model of transient heat transfer in brine-spongy ice. It analyzes the thermal behavior and discusses the thermal response of brine-spongy ice to heat input. The model is based on the global characteristics of a mixture of ice and brine. The analytical model uses phase change characteristics of brine and ice in equilibrium states. The model involves a nonlinear partial differential equation and a number of equations of state for ice, brine, and brinespongy ice. Salinity, initial temperature, and a constant temperature for one side of the ice block, are primary variables in the studies. Samples are also tested experimentally with transient conditions and their temperature responses are captured by a thermal camera. The numerical results are closely aligned with the measured temperatures. The experiments confirm the analytical model and numerical solutions. This paper establishes new understanding of trapped brine when absorbing and releasing thermal energy through brine-spongy ice. The observations indicate a new type of ice structure with considerable differences in thermal response to transient heat transfer as compared with regular ice.

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Understanding spray cloud formation by wave impact on marine objects

Cited by 38 publications

References 157 publications

Experimental Investigation of Droplet Generation by Post-Breaking Plunger Waves

Experimental Investigation of Droplet Generation by Post-Breaking Plunger Waves

3D Particle Tracking Velocimetry applied to droplets generated by breaking waves

Transient heat conduction through a substrate of brine-spongy ice

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