A microtextured structure on the surface of an anti-icing heat exchanger

Abstract

This invention discloses a micro-textured structure for the surface of an anti-icing heat exchanger, comprising: a micro-textured structure formed on the surface of the heat exchanger; the micro-textured structure includes several micro-protrusions arranged equidistantly on the surface of the heat exchanger shell; the hemispherical shape of the micro-protrusions in this invention can more evenly disperse the contact force between ice and the heat exchanger surface, effectively avoiding concentrated erosion of the surface by ice, significantly reducing wear and corrosion of the surface material, while the trapezoidal cross-section micro-grooves and serpentine microchannels work together to efficiently accommodate and guide melted ice water, quickly draining it from the heat exchange surface, preventing ice water from accumulating and forming new ice layers, reducing the risk of icing, and the micro-textured structure increases the roughness of the heat exchanger surface, enhancing the turbulence of the fluid, while the presence of microchannels further enhances this turbulence effect, thereby significantly improving the heat transfer efficiency of the heat exchanger.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to a micro-textured structure on the surface of an anti-icing heat exchanger. Background Technology

[0002] Heat exchangers are widely used in many industrial fields and daily life scenarios, and are key equipment for achieving heat exchange. However, under low temperature and high humidity conditions, their surfaces are prone to icing. The formation, growth, and shedding of ice can cause severe erosion of the heat exchanger surface, known as ice erosion.

[0003] Ice erosion causes wear and corrosion on the surface material of the heat exchanger, destroying the integrity of the surface and thus reducing the heat transfer efficiency of the heat exchanger. At the same time, frequent ice erosion will significantly shorten the service life of the heat exchanger and increase the maintenance cost and replacement frequency of the equipment.

[0004] Currently, traditional methods for preventing ice erosion mainly rely on special coating materials. However, these coatings are prone to peeling off under long-term ice erosion, and the coating preparation process is complex and costly, making it difficult to meet the needs of large-scale applications. Utility Model Content

[0005] The purpose of this invention is to provide a micro-textured structure on the surface of an anti-icing heat exchanger to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a micro-textured structure for the surface of an anti-icing heat exchanger, comprising:

[0007] Microtexture structures formed on the surface of the heat exchanger;

[0008] The microtexture structure includes several microprotrusions arranged at equal intervals on the surface of the heat exchanger shell, wherein,

[0009] Several micro-grooves are formed between the micro-protrusions to accommodate and guide the melting capacity of ice water;

[0010] Microchannels are formed between the microgrooves to further guide the flow of melted ice water.

[0011] Preferably, the inner wall of the microchannel is provided with tiny wavy undulations to disturb the ice water flowing within the microchannel.

[0012] Preferably, the micro-protrusion is shaped like a frustum of a hemispherical surface, with a bottom diameter of 60-120 μm, a height of 40-80 μm, and a center-to-center distance of 120-250 μm between adjacent micro-protrusions;

[0013] The microgrooves are located between several adjacent microprotrusions, and the cross-sectional shape of the microgrooves is trapezoidal, with an upper base width of 60-120μm, a lower base width of 40-100μm, and a depth of 30-50μm.

[0014] A plurality of microchannels are disposed between a plurality of microgrooves and are distributed in a serpentine pattern. The width of the microchannels is 20-50 μm and the depth is 10-30 μm.

[0015] Preferably, the surface of the microtextured structure is coated with a superhydrophobic coating, and the superhydrophobic coating is made of fluoride-modified nano-silica particles.

[0016] Preferably, the superhydrophobic coating is composed of a base layer, a middle layer, and a top layer; wherein,

[0017] The bottom layer is composed of a mixture of a material containing a silane coupling agent and fluoride-modified nano-silica particles;

[0018] The middle layer consists of fluoride-modified nano-silica particles doped with carbon nanotubes;

[0019] The surface layer is simply composed of fluoride-modified nano-silica particles.

[0020] Preferably, the bottom diameter of the micro-protrusion is 90 μm, the height is 60 μm, and the center-to-center distance between adjacent micro-protrusions is 180 μm;

[0021] The microgroove has an upper bottom width of 90μm, a lower bottom width of 60μm, and a depth of 40μm;

[0022] The microchannel has a width of 30 μm and a depth of 20 μm.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] 1. The micro-protruding hemispherical shape of this utility model can more evenly disperse the contact force between ice and the heat exchanger surface, effectively avoid concentrated erosion of the surface by ice, and significantly reduce the wear and corrosion of the surface material. The trapezoidal cross-section micro-grooves and serpentine microchannels work together to efficiently accommodate and guide the melted ice water, quickly discharge it from the heat exchange surface, prevent the ice water from accumulating and forming new ice layers, reduce the risk of ice erosion, and the micro-textured structure increases the roughness of the heat exchanger surface, enhances the turbulence of the fluid, and the presence of microchannels further enhances this turbulence effect, thereby significantly improving the heat transfer efficiency of the heat exchanger.

[0025] 2. In this invention, the superhydrophobic coating and microtexture structure work together to reduce the contact angle between the surface and water, making it easier for melted ice water to slide off, further improving the anti-icing and drainage effects. Moreover, through the micro-wave-shaped undulation design, the ice water flowing in the microchannel can be disturbed, making the flow state of the ice water more complex, which helps to break the laminar flow state that ice water may form during the flow process, promoting it to flow more quickly and smoothly in the microchannel, reducing the possibility of ice water refreezing and forming an ice layer, and further reducing the risk of ice erosion. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the microtexture structure of this utility model;

[0027] Figure 2 This utility model Figure 1 Enlarged structural diagram at point A;

[0028] Figure 3 This is a schematic diagram of the superhydrophobic coating structure of this utility model.

[0029] In the figure: 1. Microtexture structure; 11. Microprotrusion; 12. Microgroove; 13. Microchannel; 14. Superhydrophobic coating. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figures 1-3 This utility model provides a technical solution: a micro-textured structure for the surface of an anti-icing heat exchanger, comprising:

[0032] Microtexture structure formed on the surface of heat exchanger 1;

[0033] The microtexture structure 1 includes several microprotrusions 11 arranged at equal intervals on the surface of the heat exchanger shell, wherein,

[0034] Several micro-grooves 12 are provided between several micro-protrusions 11 to accommodate and guide the melting of ice water;

[0035] Microchannels 13 are provided between several microgrooves 12 to further guide the flow of melted ice water.

[0036] Reference Figure 2As shown, the inner wall of the microchannel 13 is provided with tiny wavy undulations to disturb the ice water flowing inside the microchannel 13.

[0037] In this embodiment, the wavy undulations of the inner wall of the microchannel 13 can effectively disturb the flow of ice water, enhance the turbulence effect, promote faster discharge of ice water, and reduce the risk of ice erosion.

[0038] Reference Figure 1 as well as Figure 2 As shown, the micro-protrusions 11 are shaped like hemispherical frustums, with a bottom diameter of 60-120 μm and a height of 40-80 μm. The center-to-center distance between adjacent micro-protrusions 11 is 120-250 μm. Several micro-grooves 12 are located between several adjacent micro-protrusions 11, and the cross-sectional shape of the micro-grooves 12 is trapezoidal, with an upper base width of 60-120 μm, a lower base width of 40-100 μm, and a depth of 30-50 μm. Several microchannels 13 are disposed between several micro-grooves 12 and are distributed in a serpentine pattern. The width of the microchannels 13 is 20-50 μm, and the depth is 10-30 μm.

[0039] In this embodiment, the hemispherical shape of the micro-protrusion 11 can evenly disperse the ice erosion force, and the trapezoidal micro-groove 12 and the serpentine microchannel 13 work together to efficiently accommodate and discharge ice water, reduce the risk of ice erosion and improve heat transfer efficiency.

[0040] Reference Figure 3 As shown, the surface of the microtexture structure 1 is coated with a superhydrophobic coating 14, and the superhydrophobic coating 14 is made of fluoride-modified nano-silica particles.

[0041] In this embodiment, the superhydrophobic coating 14 can reduce the contact angle between the surface and water, making it easier for melted ice water to slide off, reducing ice formation and accumulation, and enhancing the ability to resist ice erosion.

[0042] Reference Figure 3 As shown, the superhydrophobic coating 14 is composed of a bottom layer, a middle layer and a top layer; wherein, the bottom layer is composed of a material containing a silane coupling agent mixed with fluoride-modified nano-silica particles; the middle layer is composed of fluoride-modified nano-silica particles doped with carbon nanotubes; and the top layer is composed of fluoride-modified nano-silica particles alone.

[0043] In this embodiment, the superhydrophobic coating 14 has a three-layer structure: the bottom layer enhances adhesion, the middle layer improves strength and stability, and the top layer ensures superhydrophobic performance, thus comprehensively improving coating performance and anti-icing effect.

[0044] Reference Figure 1As shown, the bottom diameter of the micro-protrusion 11 is preferably 90 μm, the height is 60 μm, and the center distance between adjacent micro-protrusions 11 is 180 μm; the upper bottom width of the micro-groove 12 is 90 μm, the lower bottom width is 60 μm, and the depth is 40 μm; the width of the microchannel 13 is 30 μm and the depth is 20 μm.

[0045] In this embodiment, this preferred size achieves an optimal balance between effectively dispersing icing forces, efficiently draining water, and improving heat transfer efficiency, thereby further enhancing the heat exchanger's anti-icing and heat transfer performance.

[0046] Working principle: When the heat exchanger is in a low temperature and high humidity environment, an ice layer will gradually form on the surface. Due to the hemispherical shape of the micro-protrusion 11, the contact force between the ice and the surface will be evenly distributed, reducing the concentrated erosion of the surface by the ice. When the ice layer melts, the melted ice water first flows into the trapezoidal cross-section micro-groove 12, and then is quickly discharged from the heat exchange surface through the serpentine microchannel 13 at the bottom of the micro-groove 12.

[0047] The presence of the superhydrophobic coating 14 reduces the contact angle between ice water and the surface, making it easier for ice water to slide off the surface and further preventing the accumulation of ice water.

[0048] In addition, the microtextured structure 1 increases the roughness of the heat exchange surface, which generates more turbulence when the fluid flows on the heat exchange surface. The presence of the microchannel 13 further enhances this turbulence effect, thereby significantly improving the heat transfer efficiency of the heat exchanger.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A microtextured structure for the surface of an anti-icing heat exchanger, characterized in that, include: Microtexture structure formed on the surface of heat exchanger (1); The microtexture structure (1) includes a plurality of microprotrusions (11) equidistantly arranged on the surface of the heat exchanger shell, wherein, Several micro-grooves (12) are provided between the micro-protrusions (11) for accommodating and guiding the melting capacity of ice water. Microchannels (13) are provided between several of the microgrooves (12) to further guide the flow of melted ice water.

2. A micro-textured surface for an ice-phobic heat exchanger according to claim 1, wherein: The inner wall of the microchannel (13) is provided with tiny wavy undulations to disturb the ice water flowing inside the microchannel (13).

3. The ice-phobic heat exchanger surface micro-texture of claim 1, wherein: The micro-protrusion (11) is shaped like a hemispherical frustum, with a bottom diameter of 60-120μm, a height of 40-80μm, and a center-to-center distance of 120-250μm between adjacent micro-protrusions; Several microgrooves (12) are located between several adjacent microprotrusions (11), and the cross-sectional shape of the microgrooves (12) is trapezoidal, with an upper base width of 60-120μm, a lower base width of 40-100μm, and a depth of 30-50μm; A plurality of microchannels (13) are disposed between a plurality of microgrooves (12) and are distributed in a serpentine pattern. The width of the microchannels (13) is 20-50 μm and the depth is 10-30 μm.

4. The ice-phobic heat exchanger surface micro-texture of claim 1, wherein: The surface of the microtexture structure (1) is coated with a superhydrophobic coating (14), and the superhydrophobic coating (14) is made of fluoride-modified nano-silica particles.

5. A micro-textured surface for an ice-phobic heat exchanger according to claim 4, wherein: The superhydrophobic coating (14) is composed of a base layer, a middle layer, and a surface layer; wherein, The bottom layer is composed of a mixture of a material containing a silane coupling agent and fluoride-modified nano-silica particles; The middle layer consists of fluoride-modified nano-silica particles doped with carbon nanotubes; The surface layer is simply composed of fluoride-modified nano-silica particles.

6. A micro-textured surface for an ice-phobic heat exchanger according to claim 1, wherein: The bottom diameter of the micro-protrusion (11) is 90 μm, the height is 60 μm, and the center distance between adjacent micro-protrusions (11) is 180 μm; The microgroove (12) has an upper bottom width of 90 μm, a lower bottom width of 60 μm, and a depth of 40 μm; The microchannel (13) has a width of 30 μm and a depth of 20 μm.

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