Micro heat pipes and methods of use thereof

Abstract

The invention provides a micro heat pipe and a using method thereof. The micro heat pipe comprises a pipe shell and a gas-liquid baffle; the gas-liquid baffle divides the internal channel of the pipe shell into a gas-phase working medium channel flow and a liquid-phase working medium channel flow; the bottom surface of the pipe shell is a flat surface; the top surface of the pipe shell is an arc-shaped salient; and the gas-phase working medium channel flow is arranged above the liquid-phase working medium channel flow. According to the micro heat pipe, the flooding limit bottleneck of the heat pipe can be effectively prevented, thus the liquid-phase flowing resistance is relatively small; and the pipe shell and the baffle form a gas-phase channel flow profile with two sharp corners together, gas-liquid interfaces of working mediums are in the gas-phase channel flow, close to the two sharp corners of the profile, and form a wedged capillary structure with the gas-phase channel flow, and positive feedback is still effective.

Description

technical field [0001] The invention relates to a heat transfer element, in particular to a miniature heat pipe and a method for using the same. Background technique [0002] A heat pipe is a device that utilizes the principles of phase-change working medium evaporation heat absorption, condensation heat release, and capillary pressure-driven cycle operation to achieve high-efficiency heat transfer. Traditional heat pipes generally use special components such as wire mesh, fiber fabrics, porous ceramics, metal powder sinters or fine grooves as special capillary structures. Due to the manufacturing process, it is difficult to reduce the equivalent hydraulic diameter of heat pipes to a few millimeters or less. . However, in some small-scale thermal management applications, such as micro-nano spacecraft thermal control systems, highly integrated electronic equipment, and some high-power-density components, there is a strong demand for miniaturized heat pipes and heat pipe arra...

AI Technical Summary

Problems solved by technology

[0003] However, the design of these miniature heat pipes also has the following defects: first, in ordinary heat pipes, the steam and liquid flow in the opposite direction, and the shear force on the gas-liquid interface makes both flows hindered, and the heat transfer capacity will be limited. limit

However, there is no barrier between the liquid phase channel and the gas phase channel in the micro heat pipe, so the bottleneck of the carryover limit is more serious.

Second, when the heat load increases, the capillary suction force becomes stronger with the increase of the evaporation amount, while the cross-sectional area of ​​the liquid phase channel decreases continuously, so that the flow resistance of the liquid phase working medium also increases accordingly. hinders the improvement of heat transfer capacity, which is a negative feedback mechanism

In addition, due to the limitations of structural strength and processing technology, these miniature heat pipe shells must have rounded corners at the internal sharp corners, and the diameter of the meniscus-shaped gas-liquid interface will be limited by this rounded corner and cannot be infinitely reduced. Capillary suction therefore also has an upper limit

Images