Abstract
Under the threat of serious environmental pollution and resource waste, sustainable development and green manufacturing have gradually become a new development trend. A new environmentally sustainable approach, namely, cryogenic air nanofluid minimum quantity lubrication (CNMQL), is proposed considering the unfavorable lubricating characteristic of cryogenic air (CA) and the deficient cooling performance of minimum quantity lubrication (MQL). However, the heat transfer mechanism of vortex tube cold air fraction by CNMQL remains unclear. The cold air fraction of vortex tubes influences the boiling heat transfer state and cooling heat transfer performance of nanofluids during the grinding process. Thus, a convective heat transfer coefficient model was established based on the theory of boiling heat transfer and conduction, and the numerical simulation of finite difference and temperature field in the grinding zone under different vortex tube cold air fractions was conducted. Simulation results demonstrated that the highest temperature initially declines and then rises with increasing cold air fraction. Afterward, this temperature reaches the lowest peak (192.7 °C) when the cold air fraction is 0.35. Experimental verification was conducted with Ti–6Al–4V to verify the convective heat transfer coefficient model. The results concluded that the low specific grinding energy (66.03 J/mm3), high viscosity (267.8 cP), and large contact angle (54.01°) of nanofluids were obtained when the cold air fraction was 0.35. Meanwhile, the lowest temperature of the grinding zone was obtained (183.9 °C). Furthermore, the experimental results were consistent with the theoretical analysis, thereby verifying the reliability of the simulation model.
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This research was financially supported by the following organizations: the National Natural Science Foundation of China (51975305 and 51905289), the Major Research Project of Shandong Province (2018GGX103044, 2019GGX104040 and 2019GSF108236), and the Shandong Provincial Natural Science Foundation of China (ZR2019PEE008), Major Science and technology innovation engineering projects of Shandong Province (2019JZZY020111), Applied basic research Youth Project of Qingdao science and technology plan (19-6-2-63-cg).
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Zhang, J., Wu, W., Li, C. et al. Convective Heat Transfer Coefficient Model Under Nanofluid Minimum Quantity Lubrication Coupled with Cryogenic Air Grinding Ti–6Al–4V. Int. J. of Precis. Eng. and Manuf.-Green Tech. 8, 1113–1135 (2021). https://doi.org/10.1007/s40684-020-00268-6
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DOI: https://doi.org/10.1007/s40684-020-00268-6