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Intelligent hydrogel material resistance reducing system of sandwich structure

A hydrogel and sandwich technology, applied in the field of drag-reducing surface of intelligent hydrogel materials, can solve the problems of weak mechanical strength of PNIPAM hydrogel, and achieve the effect of reducing the total resistance

Active Publication Date: 2017-11-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical strength of a single PNIPAM hydrogel is weak and cannot be directly used for boundary layer control

Method used

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  • Intelligent hydrogel material resistance reducing system of sandwich structure
  • Intelligent hydrogel material resistance reducing system of sandwich structure
  • Intelligent hydrogel material resistance reducing system of sandwich structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: When h + ≤25, s + When ≤30, the surface of the smart hydrogel material with a sandwich structure has drag reduction characteristics. The length L of the elongated bottom surface 5 of the PNIPAM hydrogel 2 is 2mm, and the thickness is h 1 25μm, the distance between the bottom edge of the ultrafine heating net 3 and the bottom edge of the long strip bottom surface 5 of the PNIPAM hydrogel 2 is h 2 10μm, the thickness of the ultra-fine heating net 3 h 3 It is 8μm, the mesh is 6000, the pore size is 2.5μm, the coating thickness of PAAm hydrogel I1 and PAAm hydrogel II4 on PNIPAM hydrogel 2 is h 4 It is 7μm. It is assumed that the height h of the triangular groove is 110 μm, the width s of the groove is 130 μm, and the interval f between adjacent triangles is 200 μm. When the speed is 7.72m / s, the Reynolds number is 3.30×10 7 At this time, the drag reduction rate of the smart hydrogel material with a sandwich structure is 8.07%.

Embodiment 2

[0025] Example 2: When the speed is 14.15m / s, the Reynolds number is 6.06×10 7 At this time, the ultra-fine heating net 3 is heated to 32°C through the power supply, and the size of the drag reducing surface microstructure is: the length L of the long strip bottom surface 5 of the PNIPAM hydrogel 2 is 1.5mm, and the thickness h 1 20μm, the distance between the bottom edge of the ultrafine heating net 3 and the bottom edge of the long strip bottom surface 5 of the PNIPAM hydrogel 2 is h 2 7.5μm, the thickness of the ultra-fine heating net 3 h 3 6.5μm, mesh number is 6000, pore size is 2.5μm, the coating thickness of PAAm hydrogel Ⅰ1 and PAAm hydrogel Ⅱ4 on PNIPAM hydrogel 2 is h 4 It is 6μm. The height h of the triangular groove is set to 65 μm, the width value s of the groove is 80 μm, and the interval f between adjacent triangles is 125 μm. The drag reduction rate of the smart hydrogel material with the sandwich structure is 10.05%.

Embodiment 3

[0026] Example 3: When the speed is 20.58m / s, the Reynolds number is 8.92×10 7 At this time, the ultrafine heating net 3 is heated to 34°C through the power supply, and the size of the drag reducing surface microstructure is: the length L of the elongated bottom surface 5 of the PNIPAM hydrogel 2 is 1mm, and the thickness h 1 15μm, the distance between the bottom edge of the ultrafine heating net 3 and the bottom edge of the long strip bottom surface 5 of the PNIPAM hydrogel 2 is h 2 5μm, the thickness of the ultra-fine heating net 3 h 3 It is 5μm, mesh number is 6000, pore size is 2.5μm, the coating thickness of PAAm hydrogel Ⅰ1 and PAAm hydrogel Ⅱ4 on PNIPAM hydrogel 2 is h 4 It is 5μm. It is assumed that the height h of the triangular groove is 20 μm, the width s of the groove is 30 μm, and the interval f between adjacent triangles is 50 μm. The drag reduction rate of the smart hydrogel material with a sandwich structure is 6.29%.

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Abstract

The invention discloses an intelligent hydrogel material resistance reducing system of a sandwich structure, and belongs to the technical field of surface resistance reduction. The intelligent hydrogel material resistance reducing system is composed of PAAm hydrogel I, PNIPAM hydrogel, an ultra-fine heating net and PAAm hydrogel II. The cross section of the PNIPAM hydrogel is a combined body of a long-strip-shaped bottom face and an interval triangular upper face. The ultra-fine heating net is fixedly connected into the long-strip-shaped bottom face of the PNIPAM hydrogel, and the distance h2 between the bottom edge o the ultra-fine heating net and the bottom edge of the long-strip-shaped bottom face in the PNIPAM hydrogel ranges from 5 microns to 10 microns. The PAAm hydrogel I and the PAAm hydrogel II are applied to the upper surface and the lower surface of the PNIPAM hydrogel correspondingly. The end a and the end b of the ultra-fine heating net are provided with a positive electrode and a negative electrode correspondingly. Through the resistance reducing surface fluid-solid face microstructure and the ultra-fine heating net in the resistance reducing surface fluid-solid face microstructure, temperature control is achieved, accordingly, the microstructure form size can be changed, a navigation body adapts to changes of flow field structures of different work conditions, and the navigation speed and the voyage are increased.

Description

Technical field [0001] The invention belongs to the technical field of surface drag reduction, and in particular relates to a sandwich structure smart hydrogel material drag reduction surface. Background technique [0002] Surface frictional resistance is the main source of energy consumption for surface ships, submarines and torpedoes. The frictional resistance of surface ships due to water viscosity accounts for more than 50% of the total resistance, and the surface frictional resistance of underwater vehicles accounts for more than 80% of the total resistance. It can be seen that reducing the surface frictional resistance caused by the viscosity of water is an important subject of current scientific research, which is of great significance in theory and practical applications. [0003] The exploration of new methods for drag reduction and the development of new technologies for drag reduction have always been the priority development areas of governments. In recent years, vario...

Claims

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Application Information

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IPC IPC(8): B63B1/34B32B3/12B32B27/06B32B27/34B32B33/00
CPCB32B3/12B32B27/06B32B27/34B32B33/00B32B2307/736B32B2605/18B63B1/34Y02T70/10
Inventor 张成春高美红郑益华鲍杨春吴正阳刘燕韩志武任露泉
Owner JILIN UNIV
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