CN216815140U

CN216815140U - Pulsating heat pipe with variable pipe diameter

Info

Publication number: CN216815140U
Application number: CN202122880213.6U
Authority: CN
Inventors: 李敏霞; 党超镔; 洪思慧
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-06-24
Anticipated expiration: 2031-11-23

Abstract

The utility model provides a variable-diameter pulsating heat pipe which comprises a plurality of channels, wherein each channel comprises a heat absorption end channel and a heat release end channel, the heat absorption end channel is an expansion channel along the flowing direction of fluid, the expansion angle range is not more than 60 degrees, the heat release end channel is a contraction channel along the flowing direction of the fluid, the contraction angle range is not more than 60 degrees, and the cross section of the heat absorption end channel and the shape of the heat release end channel are one of square, rectangle, trapezoid, hexagon, circle or irregular shape.

Description

Pulsating heat pipe with variable pipe diameter

Technical Field

The utility model relates to the field of heat exchangers, in particular to a pulsating heat pipe with variable pipe diameter.

Background

The pulsating heat pipe is used in many fields needing heat dissipation, and particularly has wide application prospects in the field of heat dissipation of electronic heating elements. The application in the pulsating heat pipe has the following advantages: the heat transfer efficiency is high; the volume is smaller, and the weight is lightened. The pulsating heat pipe has the defect of slow start, even sometimes generates oscillation, is not beneficial to heat dissipation, and causes the reduction of heat dissipation capacity. How to solve the starting problem of the pulsating heat pipe and improve the heat exchange performance has become a hotspot of the current research on the pulsating heat pipe.

Therefore, a pulsating heat pipe heat exchanger with a variable pipe inner diameter is needed in the prior art to improve the heat exchange efficiency and the starting performance of the pulsating heat pipe.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pulsating heat pipe heat exchanger which can be started smoothly, avoid fluid oscillation and effectively improve the heat exchange efficiency and the comprehensive performance of the heat exchanger.

In order to realize the purpose of the utility model, the following technical scheme is provided:

a pulsating heat pipe with variable pipe diameters comprises a plurality of channels, each channel comprises a heat absorption end channel and a heat release end channel, the heat absorption end channel is an expansion channel along the fluid flowing direction, the expansion angle range is not more than 60 degrees, the heat release end channel is a contraction channel along the fluid flowing direction, the contraction angle range is not more than 60 degrees, the cross section of the heat absorption end channel and the shape of the heat release end channel are one of square, rectangular, trapezoidal, hexagonal, circular or irregular shapes.

The heat absorption end channel and the heat release end channel are the same in length.

The heat absorption end channel and the heat release end channel are different in length.

The cross section of the heat absorption end channel is the same as that of the heat release end channel.

The cross section of the heat absorption end channel is different from that of the heat release end channel.

The range of the hydraulic diameter of the channel of the pulsating heat pipe is not more than 100 mm.

The length of the heat absorption end channel is 1/100-1/2 of the length of the channel, and the length of the heat release end channel is 1/100-1/2 of the length of the channel.

Compared with the prior art, the utility model has the beneficial effects that:

the existing pulsating heat pipe is difficult to start, and fluid can oscillate along with the change of working conditions in the operation process, so that the heat exchange efficiency is reduced. According to the variable-diameter pulsating heat pipe provided by the utility model, the heat absorption end channel of the pulsating heat pipe is enlarged along the fluid flowing direction and the heat release end channel is reduced along the fluid flowing direction, so that fluid can flow along one direction more easily, the starting is easier, the fluid is prevented from vibrating, and the heat exchange capacity and the overall performance of the pulsating heat pipe are improved.

Drawings

FIG. 1 is a schematic view of the overall cross section of the variable diameter pulsating heat pipe of the present invention.

FIG. 2(a) is a schematic top view of the N-N surface and a schematic top view of the M-M surface of the S-shaped channel of the present invention.

FIG. 2(b) is a schematic diagram of the side view of the N-N surface and the top view of the M-M surface of the S-shaped channel of the present invention.

Fig. 3 is an enlarged view of the heat absorbing end and the heat releasing end of the S-bend section changing direction in a stepwise change.

Fig. 4 is an enlarged view of linear changes of the heat absorbing end and the heat releasing end in the S-bend section change direction.

Fig. 5 is an enlarged view of the curved change of the heat absorbing end and the heat releasing end in the S-bend section changing direction.

Detailed Description

In order to make the features, objects, and effects of the present invention apparent, the present invention will be further described with reference to the accompanying drawings.

As shown in FIG. 1, the pulsating heat pipe is one or more selected from the group consisting of copper, aluminum, iron, nickel, and silicon.

Example one

Fig. 2(a) and 2(b) are schematic diagrams of a pulsating heat pipe structure of the present invention, which includes a plurality of channels 1, wherein the channels 1 may be S-shaped channels, each S-shaped channel has a heat-absorbing end channel 2 and a heat-releasing end channel 3, fig. 2(a) and 2(b) are schematic diagrams of a single S-shaped channel, fig. 2(a) is a top view of an expanding pipe and a contracting pipe in fig. 1, and fig. 2(b) is a side view of the expanding pipe and the contracting pipe in fig. 1. The heat absorption end passage 2 is an expansion passage in the fluid flow direction, and the shape of the heat absorption end passage 2 may be the shape of an expansion pipe in fig. 3. The heat absorption end channel of the pulsating heat pipe is an expanding channel along the flowing direction of the fluid, the length of the part is (G + D + G ') in the figure 2(a) and the figure 2(b), G can be unequal to G', and the length (G + D + G ') of the heat absorption end channel of an S-shaped single pipe is 1/100-1/2 of the length (G + D + G' + F + E + D + E '+ F' + F ") of the S-shaped single pipe. The heat absorption end of the pulsating heat pipe is an expansion channel, and the expansion angle theta ranges from 0.01-60 degrees.

The heat release end channel 3 in fig. 2(a) and 2(b) is a narrowing channel in the fluid flow direction, and the shape of the narrowing channel may be the shape of the shrink tube in fig. 3, but is not limited to these curves. The heat release end channel 3 of the pulsating heat pipe is a channel which is reduced along the flowing direction of the fluid, the length of the part is (E + D + E ') in the graph of 2(a) and 2(b), E can be unequal to E', and the heat release end channel length (E + D + E ') of an S-shaped single pipe is 1/100-1/2 of the length (G + D + G' + F + E + D + E '+ F' + F ") of the S-shaped single pipe. The heat releasing end of the pulsating heat pipe is a reducing channel, and the reducing angle alpha ranges from 0.01 to 60 degrees. The range of the hydraulic diameter of the channel of the pulsating heat pipe is 0.001-100 mm.

The channel cross-section in fig. 2(a) and 2(b) may be square, rectangular, trapezoidal, hexagonal, circular, or irregular, and the heat absorption end channel cross-section and the heat release end channel cross-section may be the same or different.

Fig. 3 is an enlarged view of the heat absorption end and the heat release end of the pulsating heat pipe shown in fig. 2(a) and 2(b) with a single S-shaped pipe having a variable width or depth in cross section.

Example two:

the structure of the embodiment is the same as that of the embodiment I, except that the heat absorption end channel 2 is in the shape of an expansion pipe in fig. 4 and expands according to a linear rule, the heat release end channel 3 is in the shape of a contraction pipe in fig. 4 and shrinks according to the linear rule, and the material is one or more of copper, aluminum, iron and nickel.

Example three:

the structure of the embodiment is the same as that of the embodiment I, except that the heat absorption end channel 2 is in the shape of an expansion pipe in fig. 5 and expands according to a linear rule, the heat release end channel 3 is in the shape of a contraction pipe in fig. 5 and shrinks according to the linear rule, and the material is one or more of copper, aluminum, iron and nickel.

The above description is only for the preferred embodiment of the present invention, but the present invention is not limited to the above specific embodiments, and it will be apparent to those skilled in the art that several variations and modifications may be made without departing from the inventive concept of the present invention, and these modifications and improvements are within the protection scope of the present invention.

Claims

1. The pulsating heat pipe with the variable pipe diameter is characterized by comprising a plurality of channels (1), wherein each channel (1) comprises a heat absorption end channel (2) and a heat release end channel (3), the heat absorption end channel (2) is an expansion channel along the flowing direction of a fluid, the expansion angle range is not more than 60 degrees, the heat release end channel (3) is a contraction channel along the flowing direction of the fluid, the contraction angle range is not more than 60 degrees, the cross section of the heat absorption end channel (2) and the shape of the heat release end channel (3) are one of square, rectangle, trapezoid, hexagon, circle or irregular shape.

2. The pulsating heat pipe of variable pipe diameter as claimed in claim 1, wherein said heat absorption end channel (2) and said heat release end channel (3) have the same length.

3. The pulsating heat pipe of variable pipe diameter as claimed in claim 1, wherein said heat absorption end channel (2) and said heat release end channel (3) have different lengths.

4. The pulsating heat pipe with variable pipe diameter as claimed in claim 1, wherein the cross-sectional area of the heat absorbing end channel (2) is the same as the cross-sectional area of the heat releasing end channel (3).

5. The pulsating heat pipe with variable pipe diameter as claimed in claim 1, wherein the cross-sectional areas of the heat absorbing end channel (2) and the heat releasing end channel (3) are different.

6. A variable diameter pulsating heat pipe as in claim 1 wherein the range of the hydraulic diameter of the channel of the pulsating heat pipe is no greater than 100 mm.

7. The variable-diameter pulsating heat pipe as claimed in claim 1, wherein the length of the heat-absorbing end channel (2) is 1/100-1/2 of the length of the channel (1), and the length of the heat-releasing end channel (3) is 1/100-1/2 of the length of the channel (1).