Mist Generation from High-Speed Grinding with Straight Oils

Dasch, Jean Muhlbaier; D’Arcy, James B.; Kinare, Siddhartha S.; Yin, Yan; Kopple, Richard G.; Salmon, Stuart C.

doi:10.1080/10402000701852124

Cited by 18 publications

(5 citation statements)

References 2 publications

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“…13. Therefore, changing the viscosity of the base oil is also one of the effective ways to reduce air pollution [102].…”

Section: Air Pollutantsmentioning

confidence: 99%

Circulating purification of cutting fluid: an overview

Zhou³

et al. 2021

Int J Adv Manuf Technol

181

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Cutting fluid has cooling and lubricating properties and is an important part of the field of metal machining. Owing to harmful additives, base oils with poor biodegradability, defects in processing methods, and unreasonable emissions of waste cutting fluids, cutting fluids have serious pollution problems, which pose challenges to global carbon emissions laws and regulations. However, the current research on cutting fluid and its circulating purification technique lacks systematic review papers to provide scientific technical guidance for actual production. In this study, the key scientific issues in the research achievements of ecofriendly cutting fluid and waste fluid treatment are clarified. First, the preparation and mechanism of organic additives are summarized, and the influence of the physical and chemical properties of vegetable base oils on lubricating properties is analyzed. Then, the process characteristics of cutting fluid reduction supply methods are systematically evaluated. Second, the treatment of oil mist and miscellaneous oil, the removal mechanism and approach of microorganisms, and the design principles of integrated recycling equipment are outlined. The conclusion is concluded that the synergistic effect of organic additives, biodegradable vegetable base oils and recycling purification effectively reduces the environmental pollution of cutting fluids. Finally, in view of the limitations of the cutting fluid and its circulating purification technique, the prospects of amino acid additive development, self-adapting jet parameter supply system, matching mechanism between processing conditions and cutting fluid are put forward, which provides the basis and support for the engineering application and development of cutting fluid and its circulating purification.

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“…13. Therefore, changing the viscosity of the base oil is also one of the effective ways to reduce air pollution [102].…”

Section: Air Pollutantsmentioning

confidence: 99%

Circulating purification of cutting fluid: an overview

Zhou³

et al. 2021

Int J Adv Manuf Technol

181

View full text Add to dashboard Cite

show abstract

“…Lubricating oil mist is characterized by a wide spectrum of droplet sizes (from 10 −4 to 10 −7 m [25][26][27][28]). Recently, Wang et al [29] injected lubricant droplets of 1 mm size into the combustion chamber of a marine engine and found that these droplets disintegrated into smaller droplets with a size exceeding 40 µm.…”

Section: Introductionmentioning

confidence: 99%

Crankcase Explosions in Marine Diesel Engines: A Computational Study of Unvented and Vented Explosions of Lubricating Oil Mist

Ivanov,

Frolov,

Semenov

et al. 2023

JMSE

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Accidental crankcase explosions in marine diesel engines are presumably caused by the inflammation of lubricating oil in air followed by flame propagation and pressure buildup. This manuscript deals with the numerical simulation of internal unvented and vented crankcase explosions of lubricating oil mist using the 3D CFD approach for two-phase turbulent reactive flow with finite-rate turbulent/molecular mixing and chemistry. The lubricating oil mist was treated as either monodispersed with a droplet size of 60 μm or polydispersed with a trimodal droplet size distribution (10 μm (10 wt%), 250 μm (10 wt%), and 500 μm (80 wt%)). The mist was partly pre-evaporated with pre-evaporation degrees of 60%, 70%, and 80%. As an example, a typical low-speed two-stroke six-cylinder marine diesel engine was considered. Four possible accidental ignition sites were considered in different linked segments of the crankcase, namely the leakage of hot blow-by gases through the faulty stuffing box, a hot spot on the crankpin bearing, electrostatic discharge in the open space at the A-frame, and a hot spot on the main bearing. Calculations show that the most important parameter affecting the dynamics of crankcase explosion is the pre-evaporation degree of the oil mist, whereas the oil droplet size distribution plays a minor role. The most severe unvented explosion was caused by the hot spot ignition of the oil mist on the main bearing and flame breaking through the windows connecting the crankcase segments. The predicted maximum rate of pressure rise in the crankcase attained 0.6–0.7 bar/s, whereas the apparent turbulent burning velocity attained 7–8 m/s. The rate of heat release attained a value of 13 MW. Explosion venting caused the rate of pressure rise to decrease and become negative. However, vent opening does not lead to an immediate pressure drop in the crankcase: the pressure keeps growing for a certain time and attains a maximum value that can be a factor of 2 higher than the vent opening pressure.

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“…The emission rate and size distribution of oil particles are affected by many factors, including the physical properties of MWFs, the rotation speed of the spindle in milling machines, the milling process and the flow rate of MWFs. Dasch et al [18][19][20] studied the influence of the viscosity and volatility of MWFs, the flow rate of MWFs, the rotation speed of the spindle, and the milling depth on the emission rate of oil particles and found that the rotation speed had the greatest influence on the concentration of oil particles at the measuring point. The measuring point was located at the local exhaust outlet of the milling machine.…”

Section: Introductionmentioning

confidence: 99%

A prediction model of emission characteristics of oil particles induced by milling process: Emission rate and size distribution

Wang

et al. 2022

Indoor and Built Environment

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The use of metalworking fluids (MWFs) in the milling process can cause emissions of a large amount of oil particles, which can induce respiratory and immune system diseases of workers. This work examined the emission characteristics of oil particles caused by the milling process. A closed test chamber containing a real milling machine was built. The emission rates of oil particles in various sizes using five kinds of MWFs were measured, and the influence of the rotation speed of the spindle in the milling machine and the physical properties of MWFs on the oil particle emission characteristics was analysed. In addition, a prediction model of emission rate and size distribution of oil particles was introduced. Based on the measured data of oil particle emission rates in each size, the morphological particle size, distribution index and atomization coefficient in the prediction model are fitted. The deviation between the predicted and measured values of the emission rates is about 5%, which confirms the accuracy of the model. The prediction model is helpful for pollution control and ventilation strategy formulation in typical machining plants.

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Mist Generation from High-Speed Grinding with Straight Oils

Cited by 18 publications

References 2 publications

Circulating purification of cutting fluid: an overview

Circulating purification of cutting fluid: an overview

Crankcase Explosions in Marine Diesel Engines: A Computational Study of Unvented and Vented Explosions of Lubricating Oil Mist

A prediction model of emission characteristics of oil particles induced by milling process: Emission rate and size distribution

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