CN108443274A - A kind of narrow formula channel of passive type enhancing fluid turbulent effect - Google Patents

Abstract

The present invention relates to the narrow formula channels that a kind of passive type enhances fluid turbulent effect, the width of the channel cross-section is 6~20mm, height is 1~3mm, it is respectively provided with high roughness area and low roughness area on two inner walls up and down in channel, the high roughness area, low roughness area and passage axis are at 45 degree of interval fringe distribution, and two is orthogonal with respect to the fringe distribution direction on internal faces.The present invention is not reliable using translation or rotatable parts, method safety；The method for being enhanced fluid turbulent effect using passive type, is not needed extraneous auxiliary power, only relies on fluid itself kinetic energy to enhance the disturbance in turbulence effect and slype, can be used for the fields such as the heat exchange, mixing, pipeline cleaning of slype.

Description

A Narrow Channel Passively Enhances Fluid Turbulence Effects

technical field

The invention relates to the technical field of fluid turbulence, in particular to a narrow passage for passively enhancing the effect of fluid turbulence.

Background technique

Because turbulent flow enhances the disordered motion of fluid, it is often used in fluid mixing, pipe cleaning, and heat transfer enhancement. For narrow channels, the equivalent hydraulic diameter is small and the Reynolds number is also small, so it is not easy to form turbulent flow in theory, and how to create turbulent flow in narrow channels has become a technical problem. A turbulent flow mixer disclosed in patent CN107198977A uses special structures such as spiral spoilers, turbulent mixing channels, and turbulent mixing chambers to make the fluid in the pipeline form turbulent flow, so as to achieve uniform mixing of the fluid in a short time; Patent CN104613800A provides a turbulent flow superconducting heat pipe with inner spoiler and outer fins. The heat exchange device made of components improves the comprehensive performance of the heat pipe. However, due to space limitations in narrow channels, it is difficult to use structures such as spoilers and spiral fins to generate turbulent flow. Therefore, in order to enhance the turbulence effect of the fluid in the narrow channel, it is necessary to adopt new principles and methods.

Contents of the invention

The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides a narrow channel for passively enhancing the turbulent effect of the fluid in the pipe, which can effectively improve the turbulent effect of the fluid in the pipe.

The technical solution adopted by the present invention to solve the technical problem is: a narrow channel that passively enhances the fluid turbulence effect, the width of the channel section is 6-20 mm, and the height is 1-3 mm. There are high-roughness areas and low-roughness areas respectively, and the high-roughness areas and low-roughness areas are distributed at intervals of 45 degrees to the axis of the channel, and the distribution directions of the stripes on the two opposite inner wall surfaces are orthogonal.

Preferably, the roughness value of the high roughness area is 0.05-0.1 mm, and the roughness value of the low roughness area is 0.01-0.04 mm.

Further, in order to better improve the turbulence effect, the high-roughness area and the low-roughness area are geometrically complementary figures, and the size, position and orientation of the high-roughness area and the low-roughness area satisfy random distribution rules or rules Geometric pattern.

The beneficial effects of the present invention are: the present invention does not use translational or rotating parts, and the method is safe and reliable; the method of passively enhancing the turbulence effect of the fluid does not require external auxiliary power, and only relies on the kinetic energy of the fluid itself to enhance the turbulence effect and the turbulence in the narrow channel. Disturbance, can be used in narrow channel heat transfer, mixing, pipe cleaning and other fields.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a relation diagram of channel inlet velocity v and turbulence intensity k.

In the figure: 1. Upper glass block 2. Left glass block 3. Lower glass block 4. Right glass block 5. Low roughness area 6. High roughness area

Detailed ways

The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

As shown in Figure 1, there is a narrow channel for passively enhancing fluid turbulence effect. The width of the channel section is 6-20mm, and the height is 1-3mm. The upper and lower inner walls of the channel have high roughness areas and In the low roughness area, the roughness value of the high roughness area is 0.05-0.1 mm, and the roughness value of the low roughness area is 0.01-0.04 mm.

The high-roughness area and the low-roughness area are distributed with stripes at intervals of 45 degrees to the axis of the channel, and the distribution directions of the stripes on the two opposite inner wall surfaces are orthogonal.

At the same time, the high-roughness area and the low-roughness area are geometrically complementary figures, and the size, position and orientation of the high-roughness area and the low-roughness area meet random distribution rules or regular geometric patterns, so as to further improve the turbulence effect the goal of.

Example:

The narrow channel is surrounded by four glass blocks: upper glass block 1, left glass block 2, lower glass block 3, and right glass block 4. The channel length is 40mm, width is 4mm, and height is 1mm. Among them, the low roughness area 5 on the inner wall surface of the upper glass block 1 and the lower glass block 3 is equidistant stripes, the length is 4.23mm, the width is 1.41mm, the interval is 4mm, the wall surface roughness is 0.01mm, and the axis of the channel is 45 degrees. Angular distribution; the inner wall outside the low roughness zone 5 is a high roughness zone 6, and its wall surface roughness is 0.06mm. The glass walls with different roughnesses in the areas where the low roughness area 5 and the high roughness area 6 are located are made by hydrofluoric acid etching.

The enhancement effect of turbulence intensity is shown in Figure 2 (the fluid in the narrow channel is water). Curve A in Fig. 2 represents the variation curve of the turbulence intensity k of the narrow channel shown in Fig. 1 with different inlet velocities. If all the inner walls of the channel are wall surfaces of the low-roughness zone 5 and the external dimensions remain unchanged, the variation curve of the turbulence intensity k with different inlet velocities is shown in the curve B in Fig. 2 .

As shown in Figure 2, using the technical solution of the present invention, when the inlet velocity is 1mm/s, the turbulence intensity value can be enhanced from the original 0.57×10 ^-5 m ² /s ² to 1.38×10 ^-5 m ² /s ² , increased to 2.42 times of the original. And it is not difficult to obtain such a trend from Fig. 2, that is, the increase of the turbulence intensity value is proportional to the inlet flow velocity. Therefore, at higher flow rates, the increase in turbulence intensity values will be more pronounced.

Inspired by the above-mentioned ideal embodiment according to the present invention, through the above-mentioned description content, relevant workers can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, but must be determined according to the scope of the claims.

Claims (3)

1. A narrow passage for passively enhancing fluid turbulence effect, characterized in that: the width of the cross-section of the passage is 6-20mm, the height is 1-3mm, and the upper and lower inner walls of the passage respectively have high roughness zones and In the low-roughness area, the high-roughness area and the low-roughness area are distributed with stripes at intervals of 45 degrees to the channel axis, and the distribution directions of the stripes on the two opposite inner wall surfaces are orthogonal. 2. The narrow channel for passively enhancing fluid turbulence effect according to claim 1, characterized in that: the roughness value of the high roughness area is 0.05-0.1 mm, and the roughness value of the low roughness area is 0.01 mm. ~0.04mm. 3. The narrow channel for passively enhancing fluid turbulence effect as claimed in claim 1, characterized in that: the high roughness area and the low roughness area are geometrically complementary figures, and the high roughness area and the low roughness area The size, position and orientation of the area satisfy the random distribution law or regular geometric pattern.