CN-121994063-A - Chinese holly leaf-like turbulent flow element and reinforced heat exchange tube

Abstract

The invention discloses a holly leaf-shaped flow disturbing element and an enhanced heat exchange tube, and belongs to the technical field of heat exchange equipment. The turbulence element comprises a Chinese holly leaf-shaped imitation turbulence sheet, wherein each turbulence sheet is welded and fixed through adjacent thorn teeth, and an axial through type fluid channel is formed by enclosing. The bionic turbulent thorn is obliquely and equidistantly distributed on the outer turbulent flow surface and consists of two wing-shaped blades with blunt front edges and thorn-shaped rear edges, and the blades are provided with notches. The axial line of the leaf-shaped basal body is provided with flow holes at intervals, the edge of the baffle is bent to form a turbulent flow tongue piece. A plurality of turbulence elements are arranged in series in the reinforced heat exchange tube. According to the invention, through a bionic configuration, turbulence is stably generated within a wide Reynolds number range, radial circulating force is enhanced, and cooperative optimization of heat transfer enhancement and resistance reduction is realized.

Inventors

• MENG HUIBO
• ZHOU YI
• JIANG WENCHUN
• YU YANFANG
• ZHANG YUCAI
• YANG BIN
• LUO YUN

Assignees

• 中国石油大学(华东)

Dates

Publication Date

20260508

Application Date

20260327

Claims (4)

1. 1. The bionic Chinese holly leaf-shaped turbulence element is characterized by comprising 2-6 bionic Chinese holly leaf-shaped turbulence sheets, wherein each bionic Chinese holly leaf-shaped turbulence sheet comprises a leaf-shaped substrate and bionic turbulence thorns, the leaf-shaped substrate is of a bionic Chinese holly leaf-shaped structure, 3-5 sharp thorns of the bionic Chinese holly leaf are respectively arranged at the two radial ends of the leaf-shaped substrate, 1-8 sharp thorns are respectively arranged at the two axial side edges of the leaf-shaped substrate, the leaf-shaped substrate is of an arc-shaped symmetrical reverse bent structure along a long axis, the reverse bent angle is 30-120 DEG and is bent along a short axis direction to form an arc-shaped curved surface, the bending angle is 30-90 DEG, the convex side of the arc-shaped curved surface is an outer interference flow surface, the concave side of the arc-shaped curved surface is an inner interference flow surface, 2-7 groups of bionic turbulence thorns are arranged on the outer interference flow surface of the leaf-shaped substrate at equal intervals along the long axis direction of the leaf-shaped substrate, the bionic turbulence thorns and the outer interference flow surface are connected in a welding mode, the bionic turbulence thorns and the outer interference flow surface are uniformly distributed along the long axis direction of the leaf-shaped substrate at an equal interval, and all the vortex flow-shaped through the adjacent turbulence leaf-shaped turbulence sheet through the axial interference flow channels are fixed by the vortex sheet.
2. 2. The bionic flow-disturbing spine is composed of two streamline wing-shaped blades, the front edges of the wing-shaped blades are of a blunt round structure, the rear edges of the wing-shaped blades are sharply narrowed to form a spine-shaped structure, a notch is arranged between the two wing-shaped blades, and the thickness of the bionic flow-disturbing spine is 0.5-1 times that of the leaf-shaped substrate.
3. 3. The holly leaf-like turbulence element as claimed in claim 1, wherein the long axis of the substrate of the holly leaf-like turbulence sheet is provided with 1-4 groups of through holes at intervals along the axial direction, the edge parts of the through holes are bent towards the inner turbulence surface direction of the leaf-like substrate to form turbulence tongue pieces, and the through holes are communicated with the central runner and the outer runner of the holly leaf-like turbulence element.
4. 4. A reinforced mixed heat exchange tube is characterized in that a plurality of the Chinese holly leaf-shaped imitating turbulent flow elements according to any one of claims 1 to 3 are arranged in series in the heat exchange tube, the circumferential deflection angle between two adjacent turbulent flow elements is 0-90 degrees, and the ratio of the axial length of the Chinese holly leaf-shaped imitating turbulent flow elements to the hydraulic diameter is 1-5.

Description

Chinese holly leaf-like turbulent flow element and reinforced heat exchange tube Technical Field The invention belongs to the technical field of heat exchange equipment, and particularly relates to a Chinese holly leaf-shaped turbulence element and an enhanced heat exchange tube. Background The heat exchanger is widely applied to the fields of nuclear energy, chemical industry, metallurgy, petroleum, aerospace and the like, and has important significance for improving the thermal performance of the heat exchange tube and improving the energy utilization rate. The aim of the enhanced heat exchange is to reduce the volume of the equipment and simultaneously reduce the energy consumption as much as possible. The passive enhanced heat transfer technology does not need external power input, and has become an important technical direction for improving the efficiency of the heat exchange tube. According to the convection heat exchange theory, most of thermal resistance is concentrated on a boundary layer near the wall surface in the process of convection heat exchange in the tube, so that the destruction of the boundary layer is the key for enhancing heat exchange. The insertion of the turbulence element into the tube is a simple and effective passive strengthening method, and the turbulence element generates turbulence in the tube, enhances fluid stirring and mixing, increases the circulating force of the near-wall area and the main flow area, thins the boundary layer and inhibits dirt deposition, thereby improving the heat transfer coefficient. However, the conventional turbulence element can enhance heat transfer and simultaneously cause the problem of greatly improving flow resistance. At present, the pressure drop of the flow-around turbulent element is relatively controllable, but the radial mixing is insufficient under the medium-low Reynolds number, the thermal boundary layer in the near-wall area is damaged only to a limited extent, and the screen type turbulent element has excellent mixing effect but obviously increases the resistance. The existing elements mostly adopt regular geometric forms, so that the relation between the turbulence intensity and the flow resistance is difficult to effectively balance, and the cooperative optimization of heat transfer and resistance is limited. Therefore, the low-resistance in-pipe turbulence element with bionic blade configuration and the reinforced heat exchange tube are developed, so that turbulence can be stably induced in a wide Reynolds number range, fluid mixing and radial circulation are enhanced, and the low-resistance in-pipe turbulence element has important engineering value. Disclosure of Invention The invention aims to provide a Chinese holly leaf-shaped turbulence simulating element and a reinforced heat exchange tube, and aims to realize low flow resistance and high energy efficiency while stably generating turbulence, enhancing fluid stirring effect and increasing radial circulating force through innovative bionic blade design, thereby providing a brand new approach for solving the technical problems. The invention provides a Chinese holly leaf-shaped turbulence element and a reinforced heat exchange tube, which are characterized by comprising 2-6 Chinese holly leaf-shaped turbulence sheets, wherein each Chinese holly leaf-shaped turbulence sheet comprises a leaf-shaped substrate and bionic turbulence thorns, each leaf-shaped substrate is of a Chinese holly leaf-shaped structure, 3-5 sharp thorns of the Chinese holly leaf are respectively arranged at the radial two ends of each leaf-shaped substrate, 1-8 sharp thorns are respectively arranged at the axial two sides of each leaf-shaped substrate, each leaf-shaped substrate is of an arc-shaped symmetrical reverse-curved structure along a long axis, the reverse-curved angle is 30-120 degrees, the arc-shaped curved surface is formed by bending along the short axis direction, the bending angle is 30-90 degrees, the convex side of each arc-shaped curved surface is an outer disturbing surface, the concave side is an inner disturbing surface, 2-7 groups of turbulence thorns are arranged on the outer disturbing surface of each Chinese holly leaf-shaped turbulence sheet, the bionic thorns and the bionic turbulence thorns are uniformly distributed at equal intervals along the long axis direction of the Chinese holly leaf-shaped substrate at a deflection angle of 30-60 degrees, the bionic turbulence thorns are uniformly distributed along the whole-shaped turbulence sheet along the axial direction, and all the bionic flow-shaped turbulence sheets are uniformly welded along the peripheral through the bionic-shaped vortex sheet, and all the bionic-shaped vortex sheet are uniformly distributed along the through the welding channels. Further, the bionic turbulent thorn consists of two streamline wing-shaped blades, the front edges of the wing-shaped blades are of a blunt round structure, the rear edges of the wing-s