JP3084610B2 - Fluid path device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow crossing partition having upper and lower wall surfaces which are opposed to each other, having flow crossing partitions at appropriate intervals in the flow direction, and forming passages at predetermined intervals in the flow crossing direction of the partitions. The present invention relates to a fluid path device having a configuration as described above.

[0002]

2. Description of the Related Art A network crossing conduit in which a group of parallel straight passages and another group of parallel straight passages are formed in an intersection on a plane, and all intersections of the straight passages are communicated. Is already known, and the present inventors are elucidating its flow characteristics.

[0003]

The inventor of the present invention has observed experimentally the flow phenomenon of the above network crossing pipeline, and it has been found that when the crossing angle of the straight pipeline is around 30 degrees and near 60 degrees. And found that the flow characteristics differed.

[0004] Specifically, in the former case, a vibrating flow similar to that of a flip-flop circuit, which is a bistable multivibrator in electronics, appears remarkably in a network crossing conduit, whereas the latter is the case. In this case, the flow rates at the downstream end openings of the network crossing pipeline were almost the same even if there were variations in the head acting on each of the upstream end openings.

The present invention has been made in the course of further research on deforming a network intersection conduit based on the above findings.

[0006]

The fluid channel device of the present invention comprises:
For example, cooling or heating with a fluid can be performed at a high rate,
Alternatively, by incorporating the device into a discharge port having a large cross-section such as a dam and a ventilation duct, it is possible to make the outflow from each of the outlets divided in the cross-flow direction uniform. The configuration is as follows.

That is, in the first fluid channel device, a rectangular parallelepiped flow path is formed in which the upper and lower wall surfaces are opposed to each other and formed into a horizontal plane of a fixed width, and an appropriate distance between the upper and lower wall surfaces in the flow direction is determined. A strip-shaped partition wall for crossing the flow, in which three or more pieces are in series with each other in a direction perpendicular to the flow direction, is provided. At least three rows are arranged in a staggered manner, and the relationship between the front and rear passages in the flow direction is one front passage and two rear passages immediately adjacent thereto in the cross flow direction. The intersection angle of the two straight lines connecting is approximately 30
The fluid that has passed through each passage and has flowed into the front and rear flow crossing partition walls simultaneously generates a plurality of separation vortices and impinging jet vortices at the partition walls between adjacent passages, respectively. Becomes

In the second fluid channel device, a flow path having a rectangular parallelepiped cross section having upper and lower wall surfaces opposed to each other and having a horizontal surface of a fixed width is formed, and an appropriate space between the upper and lower wall surfaces in the flow direction is provided. A strip-shaped cross-flow partition wall having at least three sections in series perpendicular to the flow direction is provided, and a passage is formed at a predetermined interval in the cross-flow direction of the partition wall; At least three or more rows are arranged in a line, and the relationship between the front and rear passages in the flow direction is such that one front passage is connected to each of the two rear passages immediately adjacent thereto in the cross flow direction. The intersection angle of the two straight lines is set to be approximately 60 degrees, and the fluid that has passed through each passage and has flowed between the front and rear flow crossing partition walls is approximately equal in size at the adjacent passage partitioning portions. This results in a plurality of impinging jet vortices.

In the above-described first and second fluid path devices, the flow crossing partition wall is generally formed in a strip shape in plan view, and particularly, in the front-rear direction at the center position of the strip flow crossing partition wall. The formation of a projection having a certain length along the flow direction contributes to the stabilization of the vortex.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes an upstream water tank having a buffer water-permeable wall 1a, reference numeral 2 denotes a fluid path device according to the present invention in which a network intersection pipe is modified, and reference numeral 3 denotes a downstream water tank.

Reference numeral 4 denotes a pump for transferring the water in the downstream water tank 3 to the upstream water tank 1.

The fluid channel device 2 includes a first device and a second device. First, the first device will be described.

Reference numerals 5a and 5b denote wall surfaces of a constant width arranged in parallel in a vertically opposed state, and are horizontally arranged so as to form a channel having a rectangular parallelepiped cross section. The distance between the inner surfaces of the upper and lower wall surfaces 5a and 5b is 10 mm in this example.

6 is a flow direction f1 between the upper and lower wall surfaces 5a and 5b.
A series of three or more in the direction orthogonal to
The cross-flow partition walls provided in a juxtaposed state at regular intervals have a rectangular shape with a width of 5 mm and a height of 10 mm. Each of the cross flow partition walls 6 has a height of 10 mm and a width of 5 m at 50 mm intervals in the cross flow direction.
The passages 6a having a square cross section of m are formed, and the passages 6a are arranged in a staggered manner in the flow direction f1. Thus, it should be arranged in at least three or more rows.
Although the staggered arrangement in the illustrated example is completely symmetrical, it is not necessarily limited to this, and the symmetrical arrangement may be slightly distorted.

Thus, as shown in FIG. 2, a group of passages 6a of the partition walls 6, 6 facing each other before and after the flow direction f1,
The intersection angle θ between two straight lines s1 and s2 connecting one front passage 6a and two rear passages 6a and 6a immediately adjacent thereto in the cross flow direction is approximately 30. It is arranged to be a degree.

Next, a case where the water level of the upstream water tank 1 is maintained at, for example, about 55 cm in the circulating water channel constructed as described above will be described.

That is, the water in the water tank 1 flows through the passages 6a at the upstream end p1 of the fluid passage device 2 and passes through the passage 6a on the way.
, Flows out of the passage 6a at the downstream end p2, falls into the downstream water tank 3, and is subsequently transferred by the pump 4 into the upstream water tank 1.

When this flow is stabilized, as shown in FIG. 3, the cross flow related to the arrangement of the passages 6a clearly appears in the flow of water in the fluid passage device 2, and is surrounded by the cross flow. In the area, a backflow occurs due to the jet flow from each passage 6a separating due to the left and right edges of the passage 6a or colliding with the subsequent partition wall 6. For the two types of vortices seen in this backflow area, the former is separated vortex v1,
The latter is referred to as a collision jet vortex v2.

The separation vortex v1 and the impinging jet vortex v2 are evenly and clearly seen almost all over the flow in the fluid path device 2. At this time, the impinging jet vortex v2 associated with each passage 6a is vibrated by the separation vortex v1. Thus, a slightly symmetric vortex is formed while slightly changing the shapes of the left and right vortices. The flow in this state is an oscillating flow similar to the current of the flip-flop circuit.

Thus, the separation vortex v1 mainly prevents the development of the boundary layer, and the impinging jet vortex v2 agitates the flow, and the two complement each other to promote heat transfer between the wall surface and the fluid.

Next, the case where the above-mentioned fluid path device is the second one will be described. In this fluid path device, as shown in FIG. 4, the front and rear passages 6a in the flow direction f1 include one front passage 6a and two passages 6a, 6a immediately after the front passage 6a and adjacent to each other in the cross flow direction. Two straight lines s connecting each of
1 and s2 so that the intersection angle θ is about 60 degrees.

At this time, the height and width of the flow crossing partition 6
And the position, height, width of the passage are the same as the first,
Therefore, the distance between the partition walls is longer than the first one.

In this case as well, the staggered arrangement of the passages 6a is completely symmetrical, but is not necessarily limited to this, and the symmetrical arrangement may be slightly distorted.

Next, a description will be given of a case where the water level of the upstream water tank 1 is maintained at about 55 mm in the circulating water channel constructed as described above, similarly to the above case. That is, when the flow is stabilized, the flow of water in the fluid path device 2 is, as shown in FIG. 5, the twin impinging jet vortex v2 of the same size in relation to each passage 6a is spread over the entire fluid path. It is seen clearly and evenly, and is more stable than the unstable flow in the first device, and the oscillating flow, like the current in the flip-flop circuit, is limited.

Thus, the impinging jet vortex v2 makes the flow in the fluid device 2 uniform over its entire area, and makes the flow rate and the flow velocity of the water discharged from each passage 6a at the downstream end p2 substantially equal.

Although water is supplied to the circulating channel in any of the above-described embodiments, it is apparent that a similar effect can be obtained by supplying gas.

The flow state shown in FIG. 3 or FIG.
Although the case where the Reynolds number is approximately 2000 to 7000 is shown, it has been confirmed that the fluid path device of the present invention can obtain a flow state having a similar tendency even with a fluid having a considerably higher Reynolds number. . Here, the representative flow velocity of the Reynolds number is obtained by dividing the flow rate at the downstream end p2 by the total sectional area of all the passages 6a... Of one flow transverse partition wall 6, and the representative length is one. The hydraulic diameter (diameter depth) of the passage 6a is quadrupled.

FIG. 6 shows a modification of the second fluid path device. In this example, a projection m having a certain length is formed in the flow direction in the front-rear direction at the center position of the strip-shaped flow crossing partition wall 6 to form a cross shape in plan view. This protrusion m
Is associated with each passage 6a, the separation vortices v1 of the same size form a pair, and the vortices cause a coupled vibration. The vibration of the vortex is transmitted to the downstream side, and the outflow flow rate and the velocity at the downstream end are made uniform on average.

The first fluid path device described above is used, for example, as follows. That is, as shown in FIG. 7, it is provided on the same surface as the surface of the heating element 7 such as an IC package so that air is supplied into the fluid path device 2. Thereby, the air absorbs the heat of the heating element 7 at a high rate through the lower wall surface 5b, and effectively cools the heating element 7.

Further, the hot water may be provided in the same body as the surface of the object to be heated, and hot water may be supplied into the fluid passage device 2. 5
The heat is transmitted to the object to be heated at a high rate via a or 5b, thereby effectively heating the object to be heated.

Further, in a reservoir or the like, the water in the upper and lower layers is agitated and mixed in order to prevent a change in water quality. However, in order to perform the same treatment, the fluid path device 2 is moved underwater with the flow direction f1. It stands up so that it may turn up and down, and it is made to reciprocate up and down in this state. As a result, the water flows from the bottom to the top in the fluid passage device 2 when settling, and flows from the top to the bottom when it rises, and the water passing through the fluid passage device 2 is upstream and downstream of the fluid passage device 2. When flowing out from the ends p1 and p2, a well-mixed state is obtained. At this time, the movement of the water between the upper and lower layers is mainly performed by the attraction effect by the vertical movement of the fluid path device 2.

The above-mentioned second fluid path device is used, for example, as follows, that is, it is provided at the water discharge point of the embankment 8 of the dam as shown in FIG.
Even if the water head in the left-right direction f2 of the upstream end p1 of the fluid path device 2 fluctuates due to the effect of the flow of water stored in the dam,
The flow rate and speed of the water discharged from each passage 6a at the downstream end p2 of the fluid path device 2 are made uniform, and uneven erosion of the discharge water falling spot 9 in the left-right direction f2 is prevented.

The experimental apparatus described above is merely an example, and the dimensions and the like of each part may be arbitrarily changed without departing from the spirit of the present invention.

[0034]

According to the present invention, the following effects can be obtained. That is, according to the first aspect of the present invention,
The separation vortex and the impinging jet suppress the development of the boundary layer and promote the stirring action, thereby improving the heat transfer between the wall of the fluid passage and the fluid in the fluid passage.

Therefore, it is possible to heat and cool a specific portion at a high rate with a simple structure.
The efficiency can be improved by more than ten percent or more as compared with a simple fluid flow that does not generate a separation vortex or an impinging jet.

Further, the fluid can be effectively mixed in the fluid passage. Therefore, the water can be mixed effectively by moving the flow direction vertically in a reservoir or the like so that the water can be mixed effectively. It is possible to prevent water quality deterioration such as flower blossoms (eutrophication) due to destruction of stratification and to prevent cold water discharge (prevention of water temperature drop effect on agricultural water) by promoting even water temperature.

According to the second aspect of the present invention, twin impinging jets of the same size can be stably generated in each passage of the flow crossing partition wall. This makes it possible to equalize the flow rate and velocity of the water discharged from each passage at the downstream end.

Therefore, by using the flow crossing partition wall at the water discharge point of the dam so as to be horizontal and using each passage at the downstream end p2 as a water outlet, there is asymmetry in the inflow condition at the upstream end p1. However, the flow rate and speed of the water discharged from each water outlet can be made uniform without requiring special power, and uneven erosion in the left-right direction at the discharge water falling point can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view and FIG. 1B is a side view of a circulating water channel experimental device using a fluid channel device of the present invention.

FIG. 2 is a plan view showing the inside of a first fluid path device according to one embodiment of the present invention.

FIG. 3 is a plan view showing a flow state in the first fluid path device.

FIG. 4 is a plan view showing the inside of a second fluid path device according to another embodiment of the present invention.

FIG. 5 is a plan view showing a flow state in the second fluid path device.

FIG. 6 is a plan view showing a modification of the second fluid path device.

FIG. 7 is a longitudinal sectional view showing an example of use of the first fluid path device.

FIG. 8 is a diagram showing a use example of the second fluid path device.

[Explanation of symbols]

 5a, 5b Upper and lower wall surfaces 6 Flow crossing partition wall 6a Passage θ Intersection angle f1 Flow direction s1, s2 Straight line v1 Separation vortex v2 Impact jet vortex

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F15D 1/02 F16L 55/00

Claims (3)

(57) [Claims] 1. A flow path having a rectangular parallelepiped cross section in which upper and lower wall surfaces are formed as horizontal planes having a certain width facing each other is formed.
A strip-shaped flow crossing partition wall having at least two sections in series is provided, passages are formed at predetermined intervals in the flow cross direction of the partition wall, and the passages are arranged in at least three rows in a staggered manner in the flow direction. The relationship between the front and rear passages in the flow direction is defined by the intersection angle of two straight lines connecting one front passage and two rear passages immediately adjacent thereto in the cross flow direction. So that the fluid flowing through each passage and flowing between the front and rear flow crossing partitions simultaneously separates a plurality of separation vortices and impinging jet vortices at the partitions between adjacent passages. A fluid path device characterized by being produced. 2. A flow path having a rectangular parallelepiped cross section in which the upper and lower wall surfaces are opposed to each other and having a horizontal plane of a certain width is formed.
A strip-shaped flow crossing partition wall having at least two sections in series is provided, passages are formed at predetermined intervals in the flow cross direction of the partition wall, and the passages are arranged in at least three rows in a staggered manner in the flow direction. The relationship between the passages before and after in the flow direction is that the intersection angle of two straight lines connecting one of the front passages and each of the two rear passages immediately adjacent thereto in the cross flow direction immediately after this is At approximately 60 degrees, the fluid flowing through each passage and flowing between the front and rear flow crossing partition walls has a plurality of impinging jet vortices of substantially equal size at the partition walls between adjacent passages. A fluid path device characterized by causing 3. The fluid path device according to claim 1, wherein a projection having a predetermined length is formed in the flow direction in the front-rear direction at a center position of the strip-shaped cross flow partition wall.