CN112944085B - Structure and method for improving thermal stratification phenomenon in branch-shaped channel - Google Patents
Structure and method for improving thermal stratification phenomenon in branch-shaped channel Download PDFInfo
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- CN112944085B CN112944085B CN202110166220.1A CN202110166220A CN112944085B CN 112944085 B CN112944085 B CN 112944085B CN 202110166220 A CN202110166220 A CN 202110166220A CN 112944085 B CN112944085 B CN 112944085B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
- F16L41/021—T- or cross-pieces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
Abstract
The invention discloses a structure for improving the hot stratification phenomenon in a branch-shaped channel, wherein the branch-shaped channel is formed by mutually intersecting and connecting two pipelines, cold and hot fluids are mixed in the branch-shaped channel, the structure is composed of a fixing piece, a rotating shaft and an outer side disturbance structure, the fixing piece is radially and vertically or axially arranged in a mixing area of the branch-shaped channel in parallel, the fixing piece is connected to the pipe wall of the mixing area in the branch-shaped channel, and the rotating shaft with the outer side disturbance structure is rotatably connected with the fixing piece. The invention also discloses a method for improving the thermal stratification phenomenon in the branch-shaped channel, wherein the fluid impacts the outer disturbance structure to rotate so as to disturb the mixed flow field in the branch-shaped channel, thereby reducing the impact of branch pipe fluid on the main pipe, accelerating the mixing of cold and hot fluids, homogenizing the flow field and the temperature field of the fluid, effectively improving the thermal stratification phenomenon in the branch-shaped channel and further inhibiting the fatigue damage of the branch-shaped channel.
Description
Technical Field
The invention relates to the technical field of marine nuclear power safety and pipeline fatigue damage protection, in particular to a structure and a method for improving a thermal stratification phenomenon in a branch-shaped channel.
Background
The branch-type channel is a pipeline structure widely applied in the field of marine nuclear power, and is mainly used for conveying, mixing and reacting liquid. Taking a water supply pipeline of a steam generator in the field of marine nuclear power as an example, when liquid with different temperatures is conveyed through a branch-shaped channel, after branch-pipe jet flow enters a main pipe, cold and hot fluids are mixed in the branch-shaped channel under the impact of the branch-pipe jet flow, and when the cold and hot fluids are not completely mixed, a thermal stratification phenomenon occurs in the branch-shaped channel, so that a flow field and a temperature field in the channel fluctuate, and further the flow field and the temperature field are transmitted to a pipe wall to impact the pipe wall, so that the pipe wall bears the effects of thermal stress, impact stress and pressure stress, and the pipe wall of the branch-shaped channel can be subjected to fatigue damage accidents under the long-term stress action. For a nuclear power system under the ocean condition, the pipeline arrangement space is limited, the working environment is harsh, and the nuclear power system generates the motions of rolling, pitching, rolling, pitching and the like under the influence of ocean storms. When the pipeline does swing motion, tangential inertia force, normal inertia force and coriolis inertia force are caused, and the thermal stratification phenomenon in the branch-shaped channel becomes complicated and changeable under the action of the inertia force, so that the possibility of fatigue damage of the branch-shaped channel is further increased. Therefore, there is a need to improve the problem of thermal stratification in the branched passages due to the mixing of the cold and hot fluids.
The prior published patent CN209876180U provides a cold-heat-exchange-prevention mixed-heat fatigue-prevention pipeline structure, wherein a flow guide pipe is arranged in a main pipe at the outlet end of a branch pipe, and a gap exists between the flow guide pipe and the wall of the main pipe, so that a cold-heat fluid interface is in the middle of the main pipe and does not contact with the wall surface of the main pipe, the impact of branch pipe fluid on the pipe wall can be reduced, but the thermal stratification phenomenon is still obvious, the temperature fluctuation is large, particularly for fluid with large heat conductivity coefficient, the temperature fluctuation can be transmitted to the wall surface, and the wall surface generates large thermal stress. In addition, the patent publication CN101598258B provides a device and a method for reducing thermal fatigue of a T-shaped channel, and a porous medium with a thermal conductivity greater than that of a fluid is added in the channel, so that a flow field and a temperature field in the channel can be homogenized, and thermal shock to a pipe wall can be effectively reduced. However, due to the addition of the porous medium in the channels, the pressure drop loss after the fluid flows through the porous medium is large, which is disadvantageous for fluid transportation sensitive to pressure drop.
Compared with the prior open patents CN203703464U, CN207750648U and CN1031595A which relate to rotating structures, the invention relates to the technical field of marine nuclear power safety and pipeline fatigue damage protection, in particular to a branch-shaped channel with different temperature fluid mixing inside. The structure for improving the thermal stratification phenomenon in the branch-shaped channel is positioned in a mixing area which takes the intersection point of the axes of all the pipelines as the center and extends forwards and backwards along the axes of all the pipelines by 7 times of the equivalent diameter of the pipeline, the fixing piece is connected on the pipe wall of the mixing area, the outer side disturbance structure can be a disturbance column or a disturbance blade, and micropores or microgrooves can be formed in the disturbance structure to reduce the pressure drop loss brought by rotation. The invention is mainly used for reducing branch pipe jet impact and homogenizing a flow field and a temperature field of fluid in the branch type channel, thereby improving the thermal stratification phenomenon in the branch type channel. Meanwhile, the invention optimally designs the outer disturbance structure, thereby effectively relieving the problem of pressure drop loss in the prior patent.
Disclosure of Invention
The invention aims to provide a structure and a method for improving the thermal stratification phenomenon in a branched channel, which are characterized by effectively reducing the impact effect of branch pipe jet flow on a main pipe, homogenizing the fluctuation of a flow field and a temperature field in the mixing process of cold and hot fluids, and improving the thermal stratification phenomenon of the branched channel caused by the mixing of the cold and hot fluids, thereby inhibiting the fatigue damage of the branched channel.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in order to achieve the above object, a technical solution of an embodiment of the present invention is to provide a structure for improving a thermal stratification phenomenon in a branched channel, which is characterized by comprising at least one branched structure, wherein the branched structure is formed by connecting two pipelines, and different fluids of the two pipelines are mixed in a mixing area of the branched channel; the disturbing device composed of a fixing part, a rotating shaft and an outer disturbing structure is radially vertical or axially parallel to the main pipeline and is arranged in a branch type channel mixing area, the fixing part is connected on the pipe wall of the mixing area, the rotating shaft is arranged on the fixing part in a penetrating way, the outer disturbing structure is radially connected on the rotating shaft and can be a disturbing blade or a disturbing column, the disturbing blade is provided with a through micropore or a microgroove, and the disturbing column is radially connected on the rotating shaft in a fork-row mode, a sequential-row mode and the like.
The invention also provides a method for improving the thermal stratification phenomenon in the branch-shaped channel, which is characterized in that when the structure is arranged in the mixing area of the branch-shaped channel in a radial direction vertical or axial direction parallel manner, two streams of fluid impact the outer disturbance structure to drive the rotating shaft to rotate around the fixing piece together, so that the fluid in the branch-shaped channel is disturbed. On one hand, the impact of branch pipe fluid on the main pipe is reduced, on the other hand, the mixing of cold and hot fluid is accelerated, and the flow field and the temperature field of the fluid are homogenized, so that the thermal stratification phenomenon in the branch type channel is effectively improved. Meanwhile, micropores, microgrooves or gaps for fluid to run through exist in the outer disturbance structure, and pressure drop loss of the fluid can be effectively reduced.
Compared with the prior art, the invention has the following advantages:
the invention provides a structure and a method for improving the thermal stratification phenomenon in a branch-shaped channel, wherein a fixing piece, a rotating shaft and an outer disturbance structure are arranged in a branch-shaped channel mixing area, and under the impact of cold and hot fluids, the outer disturbance structure and the rotating shaft rotate around the fixing piece to change the flowing state of the fluid in the branch-shaped channel, so that the impact of branch-tube fluid on a main pipe is reduced, the mixing of the cold and hot fluids is accelerated, the flow field and the temperature field of the fluid are homogenized, and the temperature field and the flow field are homogenized, thereby improving the thermal stratification phenomenon in the branch-shaped channel and inhibiting the occurrence of fatigue damage accidents. Compared with the prior open patents CN203703464U, CN207750648U and CN1031595A relating to the rotation technology, the invention relates to the technical field of marine nuclear power safety and pipeline fatigue damage protection, in particular to a branch-shaped channel with different temperature fluid mixing inside, wherein the branch-shaped channel is made of 316LN austenitic stainless steel used in the nuclear power field; the structure for improving the thermal stratification phenomenon in the branch-type channel can be radially arranged perpendicular to the main pipeline axis and can also be axially arranged parallel to the main pipeline axis, the outer side disturbance structure can be a disturbance column and a disturbance blade, and micropores and microgrooves are formed in the disturbance structure; the invention is mainly used for reducing branch pipe jet impact and homogenizing a flow field and a temperature field of fluid in the branch type channel, thereby improving the thermal stratification phenomenon in the branch type channel. Compared with the method disclosed in the patent CN209876180U, the method disclosed by the invention has the advantages that the impact of branch pipe jet flow on the pipe wall directly can be reduced, the temperature field and the flow field in the channel can be homogenized, and the generation of thermal stress on the pipe wall is reduced. Compared with the method for adding the porous medium into the channel of the patent publication CN101598258B, the axial length of the rotating shaft is not more than the equivalent diameter of the main pipe and not less than the equivalent diameter of the branch pipe, so that the strength is ensured, and the large pressure drop loss of the fluid is avoided; the equivalent diameter of the outer side disturbance structure is 0-1 time of the equivalent diameter of the main pipe, the axial length of the outer side disturbance structure is not more than the equivalent diameter of the main pipe and not less than the equivalent diameter of the branch pipe, so that the outer side disturbance structure is ensured to have a large enough impacted area, and micropores, microgrooves or gaps for fluid to run through exist on the outer side disturbance structure, so that the pressure drop loss of the fluid can be effectively reduced; under the condition of fluid impact, the outer disturbance structure and the rotating shaft in the mixing area rotate around the fixing piece to disturb the mixing of cold and hot fluids, so that the cold and hot fluids are mixed more uniformly, and the effects of inhibiting the fluctuation of a flow field and a temperature field and improving the hot stratification phenomenon in the branch-shaped channel are achieved.
Drawings
FIG. 1-1 is a front view of a radial vertical arrangement provided by the present invention;
FIGS. 1-2 are side views of a radial vertical arrangement provided by the present invention;
FIGS. 1-3 are top views of a radial vertical arrangement provided by the present invention;
FIG. 2-1 is a front view of an axially parallel arrangement provided by the present invention;
FIG. 2-2 is a side view of an axially parallel arrangement provided by the present invention;
FIGS. 2-3 are top views of an axially parallel arrangement provided by the present invention;
FIG. 3 is a schematic view of the mixing process of cold and hot fluids according to the embodiment of the present invention;
FIG. 4 is a transient temperature cloud chart of z =0 cross section in an undisturbed structure branched channel;
FIG. 5 is a transient temperature cloud chart with z =0 cross section in a branched channel with a disturbance structure;
fig. 6 is a mean temperature cloud plot of x/D =0, 1, 2, 3 and 4 cross sections within an undisturbed structured branched channel;
FIG. 7 is a cloud graph of average temperatures of x/D =0, 1, 2, 3 and 4 of cross sections in a branched channel with a disturbance structure;
FIG. 8 is a graph comparing the average temperature distribution at z =0, x/D =1 and 2 positions in the branched channels with or without perturbation structures;
FIG. 9 is a comparison graph of the RMS temperature distribution of z =0, x/D =1 and position in the branched channels with and without perturbation structures;
FIG. 10 is a graph comparing pressure drop between different cross-sections in branched channels with and without perturbation structures and porous media.
Description of reference numerals:
1-main tube; 2-branch pipe; 3-a fixing piece; 4-a rotating shaft; 5-outer perturbation structure; 6-micropores;
Detailed Description
The invention will now be described in detail with reference to the following figures and examples, which are intended to illustrate the invention but not to limit the scope thereof:
the invention provides three views of a structure with radial vertical arrangement for improving the thermal stratification phenomenon, which are shown in figures 1-1, figures 1-2 and figures 1-3. The structure is radially perpendicular to the axis of the main pipe 1, is arranged at the junction of cold and hot fluids in the mixing area of the branched passage, has the length not more than the equivalent diameter of the main pipe and not less than the equivalent diameter of the branch pipe, ensures that the cold and hot fluids can be fully disturbed, and two ends of the fixing piece 3 are radially and vertically connected to the inner pipe wall of the mixing area. The invention provides three views of a structure which is arranged in parallel in the axial direction and improves the thermal delamination phenomenon, and the three views are shown in figures 2-1, 2-2 and 2-3. The structure axial direction is parallel to the axis of the main pipe 1, one end is arranged at the junction of the cold and hot fluids in the branch type channel mixing area, the other end is arranged parallel to the axis of the main pipe, the length of the structure is not more than the equivalent diameter of the main pipe and not less than the equivalent diameter of the branch pipe, the cold and hot fluids can be fully disturbed, one end of the fixing piece 3 is vertically connected to the pipe wall in the radial direction, and the other end is arranged axially parallel to the axis of the main pipe 1. In a radial vertical and axial parallel arrangement structure, a fixed part 3 supports a rotating shaft 4 and an outer disturbance structure 5, and the rotating shaft 4 is rotatably connected with the fixed part 3; the cross sections of a main pipe 1 and a branch pipe 2 of the branch-shaped channel are both square, the branch pipe 2 is vertically connected to the main pipe 1 and communicated with the main pipe 1, the inlet of the main pipe 1 is hot fluid, the inlet of the branch pipe 2 is cold fluid, and the cold fluid and the hot fluid are mixed in the branch-shaped channel; the rotating shaft 4 penetrates through the fixing part 3, the axial length of the rotating shaft 4 is not more than the equivalent diameter of the main pipe 1 and not less than the equivalent diameter of the branch pipe 2, and the rotating shaft can freely rotate around the fixing part 3; the outer disturbance structure 5 can be a straight rectangular disturbance blade and is radially connected to the rotating shaft 4, the number of the blades is not less than 1, the axial length of the blades is not more than 1 equivalent diameter of the main pipe and not less than 2 equivalent diameters of the branch pipes; the outer perturbation structure 5 is provided with round micropores 6 for reducing the pressure drop loss of the fluid, and the round micropores are arranged on the perturbation blades in a staggered mode. For the structures with two radial vertical or axial parallel arrangement modes, the method for improving the thermal stratification phenomenon in the branch-shaped channel comprises the following steps: the inner and outer disturbance structures 5 in the branch-shaped channel mixing area rotate under the impact of cold and hot fluid to drive the rotating shaft 4 to rotate around the fixing piece 3, so that the flow field and the temperature field in the branch-shaped channel are disturbed, the impact of branch pipe jet flow on the pipe wall of the main pipe is reduced, the mixing of the cold and hot fluid is accelerated, the fluctuation of the fluid flow field and the temperature field is homogenized, and the thermal fatigue damage of the branch-shaped channel structure is further improved. The following is therefore described in detail only with reference to an embodiment of the radial perpendicular arrangement:
a schematic diagram of a cold-hot fluid mixing process of an embodiment of the radial vertical arrangement mode of the invention is shown in fig. 3, the sections of a main pipe and a branch pipe of a branch-shaped channel are square, the side length of the main pipe is D, the side length of the branch pipe is D, the side length ratio of the main pipe to the branch pipe is D/D =2, the upstream and downstream distances of the main pipe are respectively 10D and 20D, and the upstream distance of the branch pipe is 10D; the structure for improving the thermal stratification phenomenon in the branch-shaped channel in the embodiment is radially and vertically arranged at the intersection of the axis of the main pipe and the axis of the branch pipe. The rotary shaft according to claim 13, wherein the equivalent diameter of the rotary shaft is larger than the equivalent diameter of the fixing member, and the axial length thereof is not larger than the equivalent diameter of the main pipe and not smaller than the equivalent diameter of the branch pipe. The rotating shaft of this example is a hollow cylinder having an equivalent diameter D a =0.083D, axial length l a And (D). The device of claim 14, wherein the outer perturbation has an equivalent diameter of 0 to 1 times the equivalent diameter of the main tube, and an axial length no greater than the equivalent diameter of the main tube and no less than the equivalent diameter of the branch tube. The outer side disturbance structure of the embodiment is two disturbance blades, and the diameter of each disturbance blade is D b =0.67D, disturbance blade length l b = D. The inlet temperatures of the main pipe and the branch pipe are respectively T m =343.48K and T b =296.78K, inlet velocities of main and branch pipes, respectively, V m =0.15m/s and V b ＝0.3m/s。
Numerical simulation is carried out on the mixing process of the cold and hot fluid in the branched channels with the undisturbed structures through a large vortex simulation method, so that instantaneous temperature cloud charts of z =0 of the internal sections of the undisturbed structures and the branched channels with the disturbed structures as shown in fig. 4 and 5 and average temperature cloud charts of x/D =0, 1, 2, 3, 4, 5 and 6 of the internal sections of the undisturbed structures and the branched channels with the disturbed structures as shown in fig. 6 and 7 are obtained. Analyzing the figure 4, when the structure is not disturbed, the branch pipe jet flow enters the main pipe and directly impacts the lower wall surface of the main pipe, so that a certain impact effect is caused on the lower wall surface; as shown in fig. 5, after the disturbance structure is added, the branch pipe jet flow enters the main pipe, and the impact of the branch pipe jet flow on the lower wall surface of the main pipe can be effectively reduced under the disturbance and the blocking of the disturbance blade. Meanwhile, comparing fig. 6 and fig. 7, the result shows that under the action of the rotational disturbance of the disturbance structure, the average temperature distribution in the branched channel is more uniform, and the thermal stratification phenomenon in the branched channel is obviously improved.
Extracting the average temperature T on the z =0, x/D =1 and 2 center lines avg And root mean square temperature T rms Quantitative analysis is carried out, and the temperature gradient and the temperature fluctuation characteristic in the mixing zone are researched. Fig. 8 shows the average temperature distribution on the center lines of z =0, x/D =1 and 2 in the branched channel with or without the disturbance structure, and the result shows that the temperature gradient in the branched channel with the disturbance structure is obviously smaller than that in the branched channel without the disturbance structure, the temperature distribution is more uniform, and the cold and hot fluids are fully mixed under the rotational disturbance of the disturbance structure. Fig. 9 shows the rms temperature distribution on the center lines z =0, x/D =1 and 2 in the branched channels with and without the perturbation structure, and the results show that the rms temperature with the perturbation structure is smaller than that without the perturbation structure as a whole, and the rms temperature distribution is more uniform. Fig. 10 is a graph comparing the pressure drop Δ P between the section x/d = -2 in the branched channel and different sections x/d =1, 2 and 4 under the condition of the disturbance structure and the porous medium, and the result shows that the pressure drop is increased compared with the disturbance structure after the disturbance structure is added, but is far less than the pressure drop loss generated by adding the porous medium.
In conclusion, the structure and the method for improving the thermal stratification phenomenon in the branch-shaped channel, provided by the invention, can effectively reduce the impact of branch pipe jet flow on the lower wall surface of the main pipe, and meanwhile, cannot generate excessive pressure drop loss; on the other hand, the fluid in the branch-shaped channel can be disturbed, the mixing of cold and hot fluids is accelerated, the temperature field in the channel is homogenized, and the thermal stratification phenomenon in the branch-shaped channel is obviously improved.
Claims (15)
1. A structure for improving the thermal stratification phenomenon in a branch-shaped channel is characterized in that the branch-shaped channel comprises at least one branch-shaped structure formed by connecting two pipelines, one of the branch-shaped structures is a main pipe, the other branch-shaped structure is a branch pipe, the main pipe and the branch pipe are used for conveying fluids with different temperatures respectively, the structure is arranged in a branch-shaped channel mixing area at the junction of cold and hot fluids, the structure comprises a fixing piece, a rotating shaft and an outer disturbance structure, one end of the fixing piece is connected to the pipe wall of the branch-shaped channel mixing area and is radially vertical to the axis of the main pipe, the other end of the fixing piece is rotatably connected with the rotating shaft, the outer disturbance structure is connected to the rotating shaft, and the rotating shaft and the outer disturbance structure rotate around the fixing piece in the mixing area under the impact of the fluids.
2. The structure for improving thermal stratification in a dendritic channel of claim 1, wherein the diameter ratio of said main pipe to said branch pipes is greater than 1, the branch pipes are connected to the main pipe at any angle and connected to the main pipe, the cross-section of the pipe is rectangular, circular or elliptical, and the pipe is made of a material having good weldability and resistance to stress corrosion cracking.
3. The structure for improving the thermal stratification in the branched channel according to claim 1, wherein the diameter ratio of the main pipe to the branch pipes is greater than 1, the branch pipes are connected to the main pipe at a certain position and communicate with the main pipe at any angle, the cross-section of the main pipe is rectangular, circular or elliptical, and the main pipe is made of 316LN austenitic stainless steel having good weldability and stress corrosion cracking resistance.
4. The structure for improving thermal stratification in a branched channel of claim 1, wherein said branched channel mixing zone is an area within the tube extending forward and backward along the axis of each tube about 7 times its equivalent diameter centered at the intersection of the axis of each tube.
5. The structure for improving the thermal stratification in the branched channels according to claim 1, wherein the fixing member in the branched channel is connected to the wall of the mixing zone of the branched channel, and is a hollow or solid cylinder made of metal or non-metal material.
6. The structure for improving the thermal stratification phenomenon in the branched channel as claimed in claim 1, wherein the rotating shaft in the branched channel is inserted into the fixing member, is rotatably connected with the fixing member, rotates around the fixing member, is a hollow or solid cylinder, and is made of a metal or non-metal material.
7. The structure for improving thermal stratification in a branched channel as claimed in claim 1, wherein the inner and outer perturbation structures of the branched channel can drive the rotation shaft to rotate freely around the fixing member under the impact of fluid, and the outer perturbation structure is connected to the rotation shaft and is a perturbation blade or a perturbation column.
8. The structure for improving thermal stratification in a branched channel of claim 1, wherein the number of said interfering vanes in said branched channel is not less than 2, and the shape is a straight rectangle, a circle, a sector, a spiral or any combination thereof.
9. The structure for improving the thermal stratification phenomenon in the branched channel as claimed in claim 1, wherein the disturbed vane blades in the branched channel are provided with through micropores and micro-grooves of any shapes, and the micropores are arranged on the vane blades in a cross-row or a straight-row manner.
10. The structure for improving thermal stratification in branched channels of claim 1, wherein the disturbing columns in the branched channels are spaced apart from each other for fluid communication to reduce pressure drop loss, and the disturbing columns are radially connected to the rotating shaft in a staggered manner.
11. A method for improving the thermal stratification in the branched channel, which employs the structure for improving the thermal stratification in the branched channel according to any one of claims 1 to 10, wherein the method reduces the branch pipe jet impact and homogenizes the flow field and temperature field of the fluid in the branched channel by disposing a fixing member, a rotating shaft and an outer disturbance structure in the mixing zone in the branched channel, thereby improving the thermal stratification in the branched channel.
12. The method of improving thermal stratification in a branched channel of claim 11, wherein the fixing member is attached to the wall of the mixing zone in the branched channel to fixedly support the rotating member and the outer perturbation structure.
13. The method of improving thermal stratification in a dendritic channel of claim 11, wherein the rotating shaft in said method has an equivalent diameter greater than the equivalent diameter of the fixture, an axial length not greater than the equivalent diameter of the main pipe and not less than the equivalent diameter of the branch pipe, and functions to couple the outer perturbation and rotate freely about the fixture.
14. The method of claim 11, wherein the outer perturbation has an equivalent diameter 0-1 times the equivalent diameter of the main tube, an axial length no greater than the equivalent diameter of the main tube and no less than the equivalent diameter of the branch tube, and is configured to rotate the rotating shaft about the fixed member after being impacted by the fluid.
15. The method for improving thermal stratification in branched channels of claim 11, wherein the outer perturbation structure of the method is perforated with through micropores, microgrooves or gaps to reduce pressure drop loss of the dredging fluid.
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