Droplet trajectories of wave-impact sea spray on a marine vessel

Dehghani, S. R.; Muzychka, Y. S.; Naterer, G.F.

doi:10.1016/j.coldregions.2016.03.010

Cited by 40 publications

(10 citation statements)

References 19 publications

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“…To determine the trajectory and velocity of the water droplets upon impact on marine platforms, several forces should be considered: air drag, gravity, and body forces (Dehghani et al, 2016a(Dehghani et al, , 2016bFu et al, 2006;Kulyakhtin and Tsarau, 2014;Lozowski et al, 2000;Lorenzini and Saro, 2013;Macdonald and McCartney, 1987;Makkonen, 2000). The motion of the droplets is governed by (Lozowski et al, 2000):…”

Section: Droplet Trajectorymentioning

confidence: 99%

Heat Transfer of Impinging Seawater Spray and Ice Accumulation on Marine Vessel Surfaces

Naterer

Muzychka

2017

Heat Trans Res

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In this paper, a new predictive model for the ice layer and water film growth, which occurs due to seawater spray impinging on large horizontal surfaces of a supply vessel, is developed using a Stefan-type problem formulation. The icing model includes conduction heat transfer in the ice and brine film layer, assuming the volume and distribution of brine pockets and air bubbles within the ice accumulation are uniform. The model also uses heat and mass balances to predict the freezing fraction, temperature distribution, ice layer and water film thickness. The results show that the water film salinity and icing intensity change with time during the icing period. Additionally, the water film salinity variations affect the freezing temperature, thermal conductivity and specific heat capacity of ice formation. As a result, heat conduction within the accumulated ice changes with time due to the variations of salinity; thus, the conduction heat flux has a significant effect on the ice thickness growth rate. This new model is a useful tool for forecasting and assessing the potential ice accumulation on marine vessels and structures.

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Section: Droplet Trajectorymentioning

confidence: 99%

Heat Transfer of Impinging Seawater Spray and Ice Accumulation on Marine Vessel Surfaces

Naterer

Muzychka

2017

Heat Trans Res

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“…A spray cloud can be defined based on time dependent spatial distributions of sizes and velocities of the droplets. The spatial distributions, including the velocity and size of the droplets, determine the spray cloud (Zakrzewski and Lozowski, 1988;Dehghani et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

“…Size and velocity distributions of the droplets in a spray cloud determine the local spray flux at every point of a vessel. Distributions of size and velocity will yield the water flux, which will also be a function of time and space (Dehghani et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

“…When a spray cloud moves, droplets start their movements at their initial positions and finish by impinging on vessel surfaces (Dehghani et al, 2009;Zakrzewski and Lozowski, 1988). The droplet trajectory method, which needs the initial size and velocity distributions, will determine the distribution of the size and velocity of the droplets at every section of the spray cloud, and consequently, the final distribution of the spray flux over the vessel surfaces (Dehghani et al, 2013;Dehghani et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

“…The liquid water content (LWC) of a spray cloud over a vessel deck ise affected by the distributions of size and velocity of droplets over a vessel platform (Ryerson, 1995;Dehghani et al, 2016a). The collision efficiency, which is a key parameter in calculating the fraction of impingement of the droplets on a specific surface, is also a function of the size and velocity of the droplets close to the surface (Zakrzewski, 1986).…”

Section: Introductionmentioning

confidence: 99%

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Droplet size and velocity distributions of wave-impact sea spray over a marine vessel

Dehghani

Naterer

Muzychka

2016

Cold Regions Science and Technology

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The spatial distribution of droplets in a spray cloud created by wave-impact sea spray and the distribution of their sizes and velocities over a vessel deck is investigated. Wave-impact sea spray, which occurs due to striking high energy sea waves on a vessel's bow, creates numerous droplets in front of a vessel. Droplets are frequently the result of sheet and droplet breakup of sea water. The velocity-size dependence of the resultant droplets is important in the modelling of marine icing phenomena. A droplet trajectory method employs the velocity-size dependence of the droplets to find their spatial distributions in the cloud of spray over the vessel deck. Drag body forces overcome the initial velocities of the droplets so they follow the wind direction and gravitational direction. The motion of the droplets affects the shape and extent of the spray cloud in front of the vessel and over the deck. In this paper, numerical methods are developed to find the distribution of sizes and velocities of the droplets over a vessel. Results show that neither the smallest nor the largest droplets reach the maximum height. The medium-size droplets can reach the maximum height of the spray cloud. As the spray cloud travels over the deck, the droplet velocities become almost the same. Comparing the numerical results with field observations shows

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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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Droplet trajectories of wave-impact sea spray on a marine vessel

Cited by 40 publications

References 19 publications

Heat Transfer of Impinging Seawater Spray and Ice Accumulation on Marine Vessel Surfaces

Heat Transfer of Impinging Seawater Spray and Ice Accumulation on Marine Vessel Surfaces

Droplet size and velocity distributions of wave-impact sea spray over a marine vessel

Transient heat conduction through a substrate of brine-spongy ice

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