Microchannel Liquid-Cooled Heat Exchanger Based on a Nonuniform Lattice: Study on Structure Calculation, Formation Process, and Boiling Heat Transfer Performance

Qian, Bo; Fan, Hongri; Liu, Gang; Zhang, Jianrui; Li, Pei

doi:10.3390/ma14237248

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…Two thermocouples, T 1 and T 2 , were successively placed on the copper block to obtain the heat flux and upper wall temperature of the copper block. Thermocouple T 3 was used to measure water temperature [29]. The accuracy of thermocouples 1 and 2 was 0.05 mm, and the distance of two thermocouples was 15 mm.…”

Section: Experimental Platform and Calculation Methods For Boiling He...mentioning

confidence: 99%

Heat Exchanging Grid Structures Based on Laser-Based Powder Bed Fusion: Formation Process and Boiling Heat Transfer Performance

et al. 2022

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Microchannel structures possess high efficiency and high boiling heat transfer coefficient of two-phase flow. In particular, the grid structure has the advantages of a simple pattern, large load capacity, and good surface adaptability. Employing the laser-based powder bed fusion (L-PBF) manufacturing technology, a new method of forming heat transfer grids with a controllable structure is proposed in this study. The formation principle, process, and the reasons for improvements in the boiling heat transfer performance were investigated with stainless steel materials. Laser scanning with varying scan spacings was used to prepare multiple structures with different grid widths and wall heights. On this basis, the porosity and pore morphology of the grid structures were analyzed, followed by pool boiling heat transfer experiments. The results revealed that the grid structure significantly affected the nucleate boiling behavior and increased the critical heat flux (CHF). It was found that the 0.5 mm sample exhibited optimum critical heat transfer performance, with an improvement of 10–27% compared to those of the other four samples (minimum of 63.3 W·cm−2 and maximum of 93.9 W·cm−2). In addition, for samples with a grid width greater than 0.5 mm, the boiling slightly decreased by <5%. When the grid width was further increased, the flow resistance effect and the bubble synapse generation effect tended to converge. In these cases, boiling heat transfer only occurred in a single phase along the direction of the medium wall thickness, thus failing to achieve two-phase heat transfer through bubble growth and collapse.

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Section: Experimental Platform and Calculation Methods For Boiling He...mentioning

confidence: 99%

Heat Exchanging Grid Structures Based on Laser-Based Powder Bed Fusion: Formation Process and Boiling Heat Transfer Performance

et al. 2022

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“…The SLM host constituted a working platform, a powder feeding system, and a laser scanning system. The experimental platform could be vacuumed or filled with a protective gas according to materials and processing requirements to prevent the oxidation or burning of metal powders during melting and solidification processes [25]. The SLM experimental facility constituted a host, a laser system, a cooling system, a control system, and a gas protection system (Fig.…”

Section: Experimental Platformmentioning

confidence: 99%

Adaptive honeycomb based on additive manufacturing: research on generation algorithm and mechanical characteristics

Qian

Fan

2023

Int J Adv Manuf Technol

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In order to solve the problems of low efficiency and complex process in the current generation algorithm and process verification of hexagonal honeycomb structures for complex spatial shapes and arbitrarily curved surfaces, this paper proposes an adaptive hexagonal grid calculation method based on the intracellular splitting iteration method for the first time. This method can better adapt to the complex spatial shape and arbitrary curved surface structure in the three-dimensional space, and it can also achieve the purpose of enhancing the mechanical performance while maintaining the lightweight structure. According to the principle of the above algorithm, different structural models including honeycomb cells are calculated and generated. 316L Stainless Steel material and Selective Laser Melting additive manufacturing processes are also used for printing actual samples. The printed samples are mechanically compressed.According to the results of the compression curve, the critical yield force of the honeycomb grid parts with iteration is higher than that of the homogeneous honeycomb grid parts, and the value is basically greater than 30%-40%. Finally, the energy absorption efficiency can be increased by more than 20% according to the compression characteristics of the adaptive iterative honeycomb analyzed.

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Optimizing the macrostructure of 3D-printed pipe surfaces to improve cleanability

et al. 2023

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Efficient heat transfer is essential for the economically sustainable operation of heat exchangers. Therefore, the internal flow is influenced systematically in various ways, for example by introducing macrostructures on the pipe surface. Since these measures may negatively affect the cleanability of the heat exchanger, it is necessary to investigate not only the increase in heat transfer, but also their impact on cleaning processes. For this purpose, the cleaning of sour milk in dimple-structured pipes is investigated experimentally. Both macroscopic and microbial cleaning tests are conducted to assess the influence of the surface’s macrostructure on cleanability. Two geometry variations of dimple-structured pipes are investigated and compared to a straight pipe Although fouling is enhanced by the dimple structures, a higher macroscopic cleaning rate can be achieved with the optimized dimple. Moreover, the residual microbial contamination decreases significantly due to the introduction of dimples. All in all, the cleaning experiments confirm the positive influence of the dimple structures on cleanability.

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Microchannel Liquid-Cooled Heat Exchanger Based on a Nonuniform Lattice: Study on Structure Calculation, Formation Process, and Boiling Heat Transfer Performance

Cited by 7 publications

References 28 publications

Heat Exchanging Grid Structures Based on Laser-Based Powder Bed Fusion: Formation Process and Boiling Heat Transfer Performance

Heat Exchanging Grid Structures Based on Laser-Based Powder Bed Fusion: Formation Process and Boiling Heat Transfer Performance

Adaptive honeycomb based on additive manufacturing: research on generation algorithm and mechanical characteristics

Optimizing the macrostructure of 3D-printed pipe surfaces to improve cleanability

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