Abstract
A microchannel radiator is advantageous due to its high efficiency and large boiling heat transfer coefficient of two-phase flow. Based on the research of uniform lattice structures, this study proposed a microchannel heat exchanger with a nonuniform lattice structure. The calculation, optimal formation, and boiling heat transfer performance of the nonuniform lattice structure based on selective laser melting (SLM) were investigated, and heat exchange samples were successfully prepared using SLM. The porosity and pore morphology of the samples were analysed, and the contrast experiments of boiling heat transfer were conducted with deionised water. The results revealed that the heat flow density of the lattice structure was a minimum of 244% higher than that of the traditional liquid-cooled plate. The critical heat flux density of the lattice structure is 110 W∙cm−2, and the critical heat flux density of the traditional flat plate is 45 W∙cm−2. In addition, the effects of cell structures indicated that for frame cells, the heat transfer effect of nonuniform frames was inferior to that of uniform frames; for face-centred cubic (FCC) cells, the nonuniform and uniform frames exhibited the same trend. However, the heat flow density of FCC cells was 25% higher than that of frame structures.
Highlights
Microchannel heat exchangers can work in harsh environments and their heat transfer efficiency depends on their microchannel structure [1]
The lattice structure exhibits a unique advantage in heat exchangers, and selective laser melting (SLM)-manufactured lattices are used for microchannel liquid-cooled heat transfer structures to withstand high heat fluxes [23]
Frame structure structure with with aa height height decreasing decreasing gradient gradient of of 11 mm mm and and height height decreasing decreasing gradient gradient 10%, 10%, (c) structure, height decreasing gradient hybrid type with a height type with a height decreasing gradient of mm and type with a height decreasing gradient of 1 mm and height decreasing gradient 10%, (d) body-centred cubic (BCC) hybrid type with a height decreasing gradient of 1 mm and height decreasing gradient 10%, (e) Frame structure with a height increasing gradient of decreasing gradient of 1 mm and height decreasing gradient 10%, (e) Frame structure with a height increasing gradient of 1 mm and height increasing gradient 10%, (f) face-centred cubic (FCC) type with a height increasing gradient of 1 mm and height increasing
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The lattice structure exhibits a unique advantage in heat exchangers, and SLM-manufactured lattices are used for microchannel liquid-cooled heat transfer structures to withstand high heat fluxes [23]. Studies on the SLM-formed lattice structure have evaluated mechanical properties with limited focus on the boiling heat transfer characteristics of these structures. Formed nonuniform lattices in boiling heat transfer and explore structure calculations and formation through the combination of SLM formation with the requirements of the. The nonuniform lattice Liquid-Cooled heat exchanger (7) The equation for calculating the four corners of the upper cell frame according to the in this paper can be potentially applied to the field of surface heat dissipation of heat coordinates of the centre point. (3) The equation for calculating the space range of the bounding box in the model
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