Fractal channel printed circuit heat exchanger

Abstract

The invention relates to a fractal channel printed circuit heat exchanger. The printed circuit heat exchanger (PCHE) is provided with heat exchange fluid channels of three-dimensional layer-by-layer diffusion type fractal tree-shaped channel networks through distributors and collectors which are arranged in inlet and outlet sealing heads, the heat exchange fluid channels are connected with inletsand outlets of the fractal tree-shaped heat exchange fluid channels on each heat exchanging plate constituting a heat exchanger core body in a matched mode, and cold and hot fluid experiences bionic complex flow and heat exchange processes such as multi-scale flow from large size main channel to micro-scale branch tail end channel in the heat exchanger core body, convective heat exchange with theheat exchanging plates and heat exchange in the heat exchanging plates; the characteristics of a heat exchange medium of low flow resistance, high heat exchange efficiency and no thermal stress in theheat exchanging plates are realized by producing coordinated equilibrium and stable velocity distribution, temperature distribution and uniform temperature distribution in the heat exchanging plates;and moreover, a bifurcation structure can effectively eliminate fluctuating vibration of flow pressure caused by driving force and inhibit a circulating cavitation phenomenon of liquid.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, to a printed circuit board heat exchanger, in particular to a fractal channel printed circuit board heat exchanger. Background technique [0002] Bionics can often provide useful inspiration for the development of new equipment and structural optimization. The human respiratory system is a high-efficiency heat and mass transfer system, which is composed of a network structure from the macro-scale trachea and bronchi to the cell-scale terminal bronchioles. Similarly, there are network structures such as plant trunks, leaf veins, mammalian blood circulation systems, and river channels that widely exist in nature, all of which constitute a fluid transport space network structure with optimal flow resistance, heat transfer, and mass transfer. This kind of similar network structure that forks layer by layer from high to low is called fractal tree channel structure in fractal theory. Applying...

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Problems solved by technology

[0004] At present, the cross-sectional size of the PCHE channel is small, which is prone to channel blockage, fluid pressure pulsation and vibration, flow resistance and vibration caused by fluid impacting the heat exchange plate at the inlet and outlet heads, uneven distribution of fluid in each channel, and hot spots on the heat exchange plate to generate heat. These technical problems directly affect the popularization and application of PCHE in ship steam power system and other industrial fields

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