阅读说明：本技术 一种用于高强度热流密度下的冷却装置 (Cooling device used under high-strength heat flux density ) 是由 张小兵 谢鹏勇 于 2020-04-29 设计创作，主要内容包括：本发明公开了一种用于高强度热流密度下的冷却装置,包括换热元件,其受热侧的内壁有螺旋式凹凸构型,换热器中心部位为螺旋叶片导流装置,用于使流体形成旋转式射流。本发明冷却装置形成的螺旋式叶片流道,不仅起到流动扰流作用,并与粗糙壁面形成扰流旋涡的互相影响,同时螺旋式叶片形成了对于加热面的射流强化传热,这大大增强了该冷却装置的散热能力。本发明的冷却装置冷却效率高效,对于高热流密度下的冷却需求能够有效解决并满足设备需求,结构简便,容易拆卸,能耗较低的优点。(The invention discloses a cooling device used under high-strength heat flux density, which comprises a heat exchange element, wherein the inner wall of the heated side of the heat exchange element is in a spiral concave-convex configuration, and the center part of a heat exchanger is provided with a spiral blade flow guide device used for enabling fluid to form rotary jet flow. The spiral blade flow channel formed by the cooling device not only plays a role of flow turbulence, but also has mutual influence of turbulent eddies formed by the spiral blade and a rough wall surface, and simultaneously, the spiral blade forms jet flow enhanced heat transfer to a heating surface, so that the heat dissipation capacity of the cooling device is greatly enhanced. The cooling device has the advantages of high cooling efficiency, simple structure, easiness in disassembly and low energy consumption, and can effectively meet the cooling requirement under high heat flow density.)

1. The cooling device for the high-strength heat flow density is characterized by comprising an upper plate and a lower plate, wherein the lower plate is a heated plate and is of a rough structure with a concave-convex configuration, the upper plate and the lower plate are arranged on a symmetrical surface, the center of the cooling device is provided with a helical blade flow guide device and is fixed on a rotating shaft at the central position, and the rotating shaft is fixed at the central position of a front inlet and a rear outlet of the cooling device.

2. The cooling device for high intensity heat flux density according to claim 1, wherein the coolant (fluid) flowing from the inlet of the cooling device enters the cooling area through the spiral structure, the heated surface in the area is the lower tube wall surface, and the spiral advancing is performed by the spiral flow channel, and the scouring effect is formed on the hot wall surface.

3. The cooling device for high heat flux density according to claim 1, wherein the depth, height and spacing of the asperities in a concave-convex configuration are optimized and determined by numerical calculation, and are each 10% of the equivalent diameter D of the cooling channel.

4. The cooling device for high-intensity heat flow density according to the claims 1 to 3, characterized in that the supporting point of the central shaft is an inlet and an outlet, and the rotating shaft on the inlet and the outlet is a compressed silica gel sealing device.

5. The cooling device for high intensity heat flux density according to claims 1-3, wherein the helical blade guiding device, wherein the helical blade can be controlled to rotate by external force or fixed to form a rotating jet according to the inertia of water flow.

6. The cooling device for high intensity heat flux density according to claim 5, wherein H is the height of the spiral blade, H is (d1-d2)/2, d1 is the diameter of the arc of the spiral blade, and d2 is the diameter of the center axis of the spiral blade.

Technical Field

The invention belongs to the technical field of engineering thermophysics, energy and utilization, and relates to a cooling device used under high-strength heat flux density.

Background

Under the influence of energy shortage and non-renewable fossil energy, the energy-saving and emission-reducing technology draws more and more attention of people, and along with the increasing shortage of traditional energy, an enhanced heat transfer device with high efficiency, simplicity and low energy consumption is required in order to reduce energy consumption and improve production efficiency. With the progress of mechanical manufacturing technology and the updating of technology, a large number of novel heat exchanger devices and technologies are developed and applied by combining the existing heat transfer enhancement theory and technology.

Heat exchangers have been extensively studied and designed, and the heating surfaces of the present invention utilize conventional roughened walls for flow turbulence. At present, the surface of the heat exchanger is mainly corrugated, and is commonly formed by rib type, concave-convex spherical type, horseshoe type rib, wedge type rib and the like. Although the corrugated sheets are different in shape, the corrugated sheets all play a role in breaking a flow boundary layer to form primary flow disturbance.

Disclosure of Invention

The invention aims to provide a cooling device used under high-strength heat flow density, and provides an active jet type cooling device aiming at the defect of insufficient heat exchange capability of the existing fin corrugated structure.

The technical scheme for realizing the purpose of the invention is as follows:

the utility model provides a cooling device for under high strength heat flux density, this cooling device comprises upper and lower slab, and lower slab is the slab that is heated, is the coarse structure of unsmooth configuration, and upper and lower slab sets up for the plane of symmetry and forms the pipe, and the cooling device center sets up to helical blade guiding device, fixes on the rotation axis of central point, and the rotation axis is fixed in the central point of cooling device's front and back access & exit.

Furthermore, the coolant, i.e. fluid, flowing into the cooling device from the inlet enters a cooling area through a spiral structure, the heating surface in the area is the wall surface of the lower circular tube, the spiral advancing is carried out by the spiral flow channel, and meanwhile, the scouring effect is formed on the hot wall surface.

Further, the depth, the height and the distance of the concave-convex rough structure are optimized and determined according to numerical calculation, and the values are 10% of the equivalent diameter D of the cooling channel.

Furthermore, the supporting point of the central shaft is an inlet and an outlet, and the rotating shaft on the inlet and the outlet is a compressed silica gel sealing device.

Further, the spiral blade guiding device can be controlled to rotate by external force or fixed to form rotary jet according to water flow inertia.

Compared with the prior art, the invention has the following remarkable advantages:

1. the invention combines the high-efficiency jet flow heat dissipation principle, utilizes the limited cooling channel and realizes the purpose of jet flow through the spiral blade flow guide device, thereby realizing the enhancement of flow heat transfer;

2. when fluid flows inside and outside the pipe, the flow speed and direction are periodically changed and secondary flow is caused due to the centrifugal force, so that the fluid turbulence is accelerated, and the purpose of enhancing heat transfer is achieved;

3. under the device, fluid forms flow turbulence through the wall surface of the corrugated pipe, generates centrifugal force through the central spiral pipeline, forms fluid forming a certain included angle with the wall surface, has higher speed, and forms scouring action on the hot wall surface, thereby forming jet flow enhanced heat transfer;

4. based on the corrugated surfaces, a spiral blade flow channel is inserted into the center of the pipeline to form rotary jet flow, so that the heat exchange between the wall surface and fluid is promoted;

5. the invention combines the traditional rough wall surface turbulent flow enhanced heat transfer technology and jet flow enhanced heat transfer means, and realizes the purpose of rotating jet flow through a spiral center plug-in structure, thereby realizing high-strength enhanced heat transfer.

Drawings

FIG. 1 is a schematic view of the structure of the apparatus of the present invention.

D is the diameter of the circular tube, D1 is the diameter of the arc where the helical blade is located, D2 is the diameter of the central shaft of the helical blade, and P is the pitch of the helical blade.

FIG. 2 is a side view of a spiral cooling device.

Fig. 3 is a schematic diagram showing the specific shape and size of the helical blade in fig. 1. H is the height of the helical blade, and H is (d1-d 2)/2.

In the figure, 1, a circular pipe heated wall surface, 2, a spiral blade flow guide device, 3, a central rotating shaft, 4, a shaft end bearing fixing device and 5, a motor.

Detailed Description

The invention will be further explained with reference to the drawings

The invention relates to a high-strength compact heat exchanger used under high heat flux density.A heat transfer enhancement cooling device is formed by combining a traditional rough pipe wall type heat exchanger with a dynamically rotating spiral blade to form jet flow, and realizes wall surface cooling by utilizing high-speed jet flow scouring.

The utility model provides a cooling device for under high strength heat flux density, this cooling device comprises upper and lower slab, and lower slab is the slab that is heated, is the coarse structure of unsmooth configuration, and upper and lower slab sets up for the plane of symmetry and forms the pipe, and the cooling device center sets up to helical blade guiding device, fixes on the rotation axis of central point, and the rotation axis is fixed in the central point of cooling device's front and back access & exit.

The cooling device enters a cooling area through a spiral structure by flowing in coolant, namely fluid from an inlet, the heating surface in the area is the wall surface of a lower circular tube, the spiral advancing is carried out by a spiral flow passage, and meanwhile, the scouring effect is formed on the hot wall surface.

The depth, the height and the distance of the rough structure with the concave-convex configuration are optimized and determined according to numerical calculation, and the values of the depth, the height and the distance are 10% of the equivalent diameter D of the cooling channel.

The supporting point of the central shaft is an inlet and an outlet, and the rotating shaft on the inlet and the outlet adopts a silica gel sealing device after being compressed.

The spiral blade guiding device has spiral blades capable of rotating under controlled action of external force or forming rotating jet flow in fixed mode based on the inertia of water flow.

The structure of the invention is shown in figure 1, and the reinforced heat transfer device comprises a rough wall surface 1, a helical blade flow guide device 2, a central rotating shaft 3, a shaft end bearing fixing device 4 and a motor 5. Cooling fluid flows in from an inlet, forms spiral jet flow through the rotary spiral blade flow guide device 2, and forms scouring cooling on the hot wall surface of the pipeline through scouring the rough wall surface 1. According to the existing research, the cooling capacity of the jet flow is far higher than the convection heat exchange capacity of the common flow, so that the high-efficiency cooling is realized by the rotary jet flow.

In the present invention, H is 20% of the cooling passage equivalent diameter D, D2 is 10% of the cooling passage equivalent diameter D, and the pitch P is twice D2, B1 is 0.5mm, and B2 is 1.0 mm. The basic pipeline of the invention is r, L, 50mm, 1000mm, D, 2 r.

Because the fluid directly impacts the heating surface, the flow is short, the boundary layer formed on the impacted surface is very thin, and the heat is rapidly taken away, so the method of the rotating jet flow can generate higher convective heat exchange effect. In fact, the present invention is distinguished from the conventional jet formed by pressure difference, in which the fluid has the characteristic of high-speed rotating flow due to the rotation of the blades, thereby forming a scouring cooling effect on the hot wall surface, and the effect of the jet formed by pressure difference is lower. The invention has great application value in narrow channels and the generated heat exchange effect is far greater than that of the traditional rough ribbed pipeline. In addition, according to the synergistic heat transfer effect of the fields in the turbulent flow heat transfer principle, the rotating jet flow causes the included angle between the flow direction and the fluid temperature gradient direction to be reduced, and the heat convection capability is improved.