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Coating for long term flow control around marine objects

A technology of coating materials and uses, applied in the field of artificial fur, can solve problems such as loss of effect

Pending Publication Date: 2019-10-15
INNOVALUE BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So a passive system that relies solely on trapped air (eg, inside flocking) will lose its effect shortly after the ship starts moving

Method used

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  • Coating for long term flow control around marine objects
  • Coating for long term flow control around marine objects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 clearly shows the difference in frictional resistance on fiber-coated discs of different lengths and thicknesses. The shorter the fiber, the smaller the frictional resistance; the thinner the fiber with the same average length, the smaller the frictional resistance. These findings imply that in order to reduce frictional resistance, the fibers should be as short and thin as possible. However, the dimensions should be chosen carefully so that the reduction in residual resistance still exists and, therefore, there will be a minimum, especially for the length of the fibers. As shown in Example 7, for a slender container dominated by frictional resistance, the resistance of the 0.7 mm fiber is neutral, which is still a fiber with residual resistance properties. The fact that the resistance of the 3 mm long and thick fibers was found to be a neutral resistance for Examples 4 and 5 indicates that in this length region, a decrease in residual resistance can be match...

Embodiment

[0046] Example 1 - Measurement of Frictional Resistance by Turntable Device

[0047] Frictional resistance tests were performed in a laboratory environment using rotating PVC discs, spun in water, coated with fibres. In addition to measuring flat PVC discs, two groups of discs were compared: short fibers with the same mean diameter but different mean lengths (0.5 and 1.0 mm) and long fibers with different mean diameters (27, 50 and 70 μm) (mean 3mm). Measures the rotational speed produced by a specific torque. Several torque values ​​were used, measuring a characteristic torque in each case. Since it's flat, drag is purely about friction. Measurements are carried out at different torques.

[0048] In one characteristic measurement, a 0.5 mm long fiber-covered surface resulted in a 29% reduction in rotational speed and a 1.0 mm long fiber-covered surface resulted in a 35% reduction in rotational speed relative to a smooth PVC disc, suggesting that shorter fibers lead to i...

Embodiment 2

[0049] Example 2 - Cleaning Properties

[0050] An offshore standby vessel was coated with an average of 3mm fibers (average fiber thickness 44μm) and the vessel was tested in water for 2.5 years, meaning idled in a standby location near an oil platform, sailing only occasionally. After 2 years there was almost no dirt (checked underwater) and after 2.5 years the boat was dry docked. During dry docking, any dirt present can be easily removed. A small portion of dirt passes through the 3mm thick fiber layer and is permanently adhered by the thick adhesive layer.

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Abstract

The invention pertains to the use of an easy-to-clean soft fiber-coated material on the underwater surface of structures to mimic mammal pelage and as such reducing residual drag, wherein said material comprises or consists of fibers having an average fiber length between 0.3 and 4 mm, and an average fiber thickness between 5 and 80 [mu]m. The underwater surface of structure is preferably the hullof a movable or moving vessel, or the underwater part of a static structure such as offshore wind monopiles and off-shore rigs. In some embodiments, the invention pertains to the reduction of fuel consumption of a nautical vessel passing through water.

Description

technical field [0001] The present invention relates to artificial fur that calms the flow of water around submerged objects. Background technique [0002] Underwater (marine) objects, whether static with currents around them, or navigating in static or moving water, experience forces from the surrounding water. Fluid mechanics have been trying to minimize these forces by changing the surface properties of the surface. Often, nature is observed for this purpose. The most famous example is the so-called "shark-skin effect" (eg, Bechert, D., Bruse, M., Hage, W. et al. Naturwissenschaften (2000) 87:157. doi:10.1007 / s001140050696 ). Another example is the creation of very smooth surfaces as an "ultimately smooth surface" that mimics the smooth skin of fish (e.g. Yang Wu et al., Biomimicking lubrication superior to fish skin using responsive hydrogels, NPG Asia Materials (2014 )6, e136). Most of the simulated animals are fully underwater animals. For these animals, in addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B1/34
CPCB63B1/34F15D1/12F15D1/003Y02T70/10B63B1/36B63B2231/40
Inventor H·J·A·布鲁尔
Owner INNOVALUE BV