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Thermographic Observation of High-Frequency Ethanol Droplet Train Impingement on Heated Aluminum and Glass Surfaces

Fluid Dynamics & Materials Processing 2022年第6期18卷 1711-1718页

作者： baris burak kanbur Sheng Quan Heng Fei Duan School of Mechanical and Aerospace Engineering Nanyang Technological University639798Singapore

The present study considers the impingement of a train of ethanol droplets on heated aluminum and glass *** surface temperature is allowed to vary in the interval 140℃–240℃.Impingement is considered with an inclination of 63 *** droplet diameter is 0.2 mm in both aluminum and glass surface *** gradients are observed with a thermographic *** is found that in comparison to glass,the aluminum surface displays very small liquid accumulations and better evaporation performance due to its higher thermal *** relatively low thermal conductivity of glass results in higher thermal gradients on the *** droplet impact area on the aluminum surface is smaller than the corresponding area for the glass ***,the liquid accumulation area is not ***,the extension of the droplet train impact region decreases on increasing the surface temperature because higher temperature values allow greater surface energy levels that enhance significantly the evaporation rate.

关键词： Droplet impingement boiling thermal flow droplet spreading two phase flow heat transfer

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Hydrodynamic Pattern Investigation of Ethanol Droplet Train Impingement on Heated Aluminum Surface

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1331-1338页

作者： baris burak kanbur Sheng Quan Heng Fei Duan School of Mechanical and Aerospace Engineering Nanyang Technological University639798Singapore

Steady-state hydrodynamic patterns of ethanol droplet train impingement on the heated aluminum surface is investigated in the surface temperature range of 80°C–260°C using two different Weber numbers(We)of 618 and *** of a vertical train impingement,the droplet train is sent to the aluminum surface with an incline of 63 *** in the spreading length are observed at different surface temperatures for two different We values,which are obtained by using two different pinholes with 100 and 150μm *** greatest spreading length is seen at the lowest surface temperature(80°C)and it continuously decreases until the surface temperature of 200°*** 200°C,the spreading length remains stable which is most probably because of the Leidenfrost *** spreading lengths of the experiments with 100μm are 46.4%smaller than the experiments with 150μ***,splashing angles are observed for both We *** ranges of splashing angle observations are 140°C–200°C and 170°C–185°C for We values of 792 and 618,respectively.

关键词： Hydrodynamic patterns boiling droplet spreading two phase flow heat transfer

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Three-Dimensional Printing Conformal Cooling with Structural Lattices for Plastic Injection Molding

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Frontiers in Heat and Mass Transfer 2024年第2期22卷 397-415页

作者： Suping Shen baris burak kanbur Chenlong Wu Fei Duan Singapore Centre for 3D Printing Nanyang Technological University639798Singapore School of Mechanical and Aerospace Engineering Nanyang Technological University639798Singapore

The design of three-dimensional printing based conformal cooling channels(CCCs)in injection molding holds great *** to CCCs,conformal cooling(CC)cavity solutions show promise in delivering enhanced cooling performance for plastic products,although they have been *** this research,CC cavity is designed within the mold geometry,reinforced by body-centered cubic(BCC)lattice structures to enhance mechanical *** distinct BCC lattice variations have been integrated into the CC cavity:the BCC structure,BCC with cubes,and BCC with *** thermal performances of the BCC lattice-added CC cavity are assessed numerically after experimental *** provide feasible solutions from viewpoints of thermal performances,various BCC lattice structure thicknesses are analyzed in the range of 0.8–*** simulation outcomes reveal that thicker lattice structures enhance mechanical strength but simultaneously lead to an increase in cooling *** examining all the proposed CC cavity solutions supported by BCC,the cooling times range from 2.2 to 4 s,resulting in a reduction of 38.6%to 66.1%when compared to conventional straightdrilled *** contrast to CCCs,CC cavities have the potential to decrease the maximum temperature nonuniformity from 8.5 to 6 ***,the presence of lattice structures in CC cavity solutions results in an elevated pressure drop,reaching 2.8MPa,whereas the results for CCCs remain below2.1MPa.

关键词： Conformal cooling cavity plastic injection additive manufacturing computational simulation thermal analysis lattice structure

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