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A super-lyophilic-super-slippery patterned surface and its processing method for enhancing droplet condensation heat transfer

A patterned surface, droplet condensation technology, applied in special surfaces, pretreatment surfaces, devices for coating liquids on surfaces, etc. The problem that the condensate cannot be quickly gathered and transported can improve the long-term efficiency of heat transfer, strengthen the heat transfer of dropwise condensation, and improve the efficiency of condensation heat transfer.

Active Publication Date: 2022-04-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Submerging the superhydrophobic nanostructures with a lubricating liquid can obtain a super-slippery surface. The droplets on the super-slippery surface are in the shape of a spherical segment and the sliding angle is extremely small, and the droplets and the lubricating liquid are immiscible, which can form a steady-state drop-like condensation (Science Advances, 2018 ,4:eaaq0919), but the droplet condensate on the super-slippery surface cannot gather and transport quickly, which reduces the surface condensate renewal rate and condensation heat transfer efficiency

Method used

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  • A super-lyophilic-super-slippery patterned surface and its processing method for enhancing droplet condensation heat transfer
  • A super-lyophilic-super-slippery patterned surface and its processing method for enhancing droplet condensation heat transfer
  • A super-lyophilic-super-slippery patterned surface and its processing method for enhancing droplet condensation heat transfer

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 and 2 As shown, the present embodiment provides a super-lyophilic-super-slippery patterned surface that strengthens drop-like condensation heat transfer, including a substrate 1, a super-lyophobic nanostructure 2, a liquid lubricating layer 3, a super-lyophilic pattern 4 and a patterned surface. Water film5.

[0034] The super lyophobic nanostructure 2 is a nanostructure processed on the surface of the substrate and has super lyophobic properties. In this embodiment, the nanostructure is a nanotube structure.

[0035] The liquid lubricating layer 3 is a lubricating liquid layer that is locked by the super lyophobic nanostructure 2 after the lubricating liquid infiltrates the super lyophobic nanostructure 2 .

[0036] The super-lyophilic pattern 4 is a groove-shaped pattern processed in the super-lyophobic nanostructure 2 , that is, the super-lyophilic pattern 4 is depressed in the super-lyophobic nanostructure 2 . In this embodiment, the super-lyoph...

Embodiment 2

[0049] This embodiment provides a super-lyophilic-super-slippery patterned surface that enhances drop-like condensation heat transfer. Its structure is the same as that of Embodiment 1, the only difference is that the nanostructure is a nanowire structure; the super-lyophilic pattern is a square stripe array .

[0050] The processing method of the super-lyophilic-super-slippery patterned surface of the enhanced droplet condensation heat transfer comprises the following steps:

[0051] Step 1, using alkaline oxidation to process super-lyophilic nanostructures on the copper substrate. Among them, the solution is 2.5mol L -1 Potassium hydroxide and 0.065mol L -1 Potassium persulfate mixed aqueous solution, the temperature of the aqueous solution is 70°C, and the oxidation time is 40min.

[0052] Step 2. The super-lyophilic nanostructure obtained in step 1 is soaked in 1 wt% fluorosilane ethanol solution for 90 minutes to obtain a super-lyophobic nanostructure.

[0053] Step 3...

Embodiment 3

[0058] This embodiment provides a super-lyophilic-super-slip patterned surface that enhances drop-like condensation heat transfer. Its structure is the same as that of Embodiment 1, the only difference is that the nanostructure is a nano-fluff structure; the super-lyophilic pattern is a wedge-shaped stripe array .

[0059] The processing method of the super-lyophilic-super-slippery patterned surface of the enhanced droplet condensation heat transfer comprises the following steps:

[0060] Step 1, using nanosecond ultraviolet laser ablation to process super-lyophilic nanostructures on stainless steel / copper substrates. Among them, the laser power is 3W, the laser frequency is 100kHz, the line-fill scanning spacing is 5μm, and the line scanning speed is 500mm / s.

[0061] Step 2. The super-lyophilic nanostructure obtained in step 1 was soaked in 1 wt% fluorosilane ethanol solution for 120 minutes to obtain a super-lyophobic nanostructure.

[0062] Step 3, using nanosecond laser...

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Abstract

The invention discloses a super-lyophilic-super-slippery patterned surface and a processing method thereof for enhancing drop-like condensation heat transfer. The surface comprises a substrate, a super-lyophobic nanostructure, a liquid lubricating layer, a super-lyophilic pattern and a patterned water film The super-lyophobic nanostructure is a nanostructure that is processed on the surface of the substrate and has super-lyophobic properties; the liquid lubricating layer is a lubricating liquid layer that is locked by the super-lyophobic nanostructure after the lubricating liquid infiltrates the super-lyophobic nanostructure; The lyophilic pattern is a groove pattern processed in the superlyophobic nanostructure; the superlyophilic pattern is a wedge-shaped or square stripe array; the patterned water film is a water film formed by infiltration on the superlyophilic pattern; the liquid lubricating layer The boundary with the patterned water film is clear and immiscible; the patterned water film forms a super-lyophilic pattern area, and the liquid lubricating layer locked by the super-lyophobic nanostructure forms a super-slip area. The invention can realize steady-state drop-like condensation, and significantly improves the condensation heat transfer efficiency and the long-term performance of drop-like condensation heat transfer.

Description

technical field [0001] The invention belongs to the technical field of condensation and heat and mass transfer, and relates to a surface, in particular to a super-lyophilic-super-smooth patterned surface and a processing method thereof for enhancing drop-like condensation heat transfer. Background technique [0002] Condensation, as an efficient heat transfer method, has important application value in the fields of heat dissipation of high heat flux microelectronic devices and new energy equipment. In addition, condensation can condense fog into liquid droplets, so it is also highly valued by researchers in the fields of anti-fog and water resource collection. [0003] Condensation is divided into film condensation and drop condensation. During film condensation, the condensate forms a liquid film and spreads on the surface, and then the hot steam needs to exchange heat with the surface through the liquid film, which has a large thermal resistance. In the case of droplet c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D5/04B05D5/00B05D5/06B05D3/14B05D3/10C25D11/02
CPCB05D5/04B05D5/00B05D5/061B05D3/14B05D3/102C25D11/02B05D2202/35B05D2202/45B05D2202/15
Inventor 杨晓龙祁飚唐煜朱荻
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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