Investigation of fine droplet generation from hot engine oil by impinging gas jets onto liquid surface

Ehteram, Mohammad Ali; Tabrizi, Hassan Basirat; Ahmadi, Goodarz; Safari, Mohammad S.; Mirsalim, Mojtaba

doi:10.1016/j.jaerosci.2013.07.004

Cited by 11 publications

(5 citation statements)

References 12 publications

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“…86) Figure 10 shows the droplet generation process in a transparent vessel. 143) The reasons for the droplets generation can be pressure fluctuations, horizontal and vertical cavity oscillations, 144) shearing by the gas stream, breakup of large droplets, entrainment into a gas stream, 69) and by the growth of the ripples. 145) M. Iguchi 146) exhaustively reviewed the mechanisms of the bubble and droplet generation in a bath subjected to bottom gas injection through a single-hole nozzle using many examples.…”

Section: Splashing and Droplet Generation Behaviormentioning

confidence: 99%

Physical and Mathematical Modeling of Multiphase Flows in a Converter

et al. 2018

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Section: Splashing and Droplet Generation Behaviormentioning

confidence: 99%

Physical and Mathematical Modeling of Multiphase Flows in a Converter

et al. 2018

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“…To generate a distribution of oil droplets in the same size as the oil droplets in blow-by gases of IC engines, an atomizer was designed (Ehteram, et al 2013). Fig.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…Although many experiments have been done to develop the oil particles inertial impactors, Satoh et al (2000) investigated the efficiency and optimization of the inertial impactors with the method of computational fluid dynamic(CFD). Ehteram et al (2013) introduced a new method for producing of micron droplets with impacting an air jet to the surface of engine oil. Gas permeation into the oil surface leads to formation of oil strings and with impacting the air jet to these strings, the ultrafine droplets form with the diameter less than 5 micrometers.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of the Efficiency and Pressure Drop of an Inertial Impactor with Variable Area

Ayouri

Ehteram

2019

JAFM

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The deposition efficiency and pressure drop of inertial impactor with variable area has been studied numerically and experimentally. The effect of volumetric flow rate, vertical barrier, oblique barrier and flexible concave plate versus deposition and impaction efficiency and pressure drop is investigated. Numerical simulation is carried out with DPM (discrete phase method) and turbulent model of SST k-ω. To validate the numerical results a special test rig is designed to study the deposition efficiency of engine oil droplets (blow-by) with a diameter of 0.1 to 6 µm. Experimental Tests are done in 8, 12, 16 and 20 L/min. To ensure the accuracy of the experimental results, all the tests are repeated at least three times for each volumetric flow rate. Gravimetric method is implemented to calculate the deposition efficiency. According to the results, the deposition efficiency is obtained between 73 and 94 percent for different mentioned impactors and different volumetric flow rate. The numerical results are confirmed by experimental results. Using the barriers increase the efficiency maximum 6 percent in different volumetric flow rate. The results show that by reducing the distance between the vertical barrier and the outlet of nozzle, the deposition and impaction efficiency are increased. Also, the Concave flexible plate with vertical barrier located at 1 mm from the outlet of nozzle is the most efficient case.

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“…The atomizer was specially designed to produce a distribution of oil droplets similar to the size distribution of oil droplets in blow-by gases of IC engines [22]. A schematic diagram of the experimental apparatus is shown in Fig.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…More detailed specification of the atomizer can be accessed in Ref. [22]. Atomizer's output travels through the coarse oil separator to ensure the removal of droplets bigger than the desirable range from the flow (Typically liquid film formed in the wall of the pipes).…”

Section: Experimental Apparatusmentioning

confidence: 99%

Taguchi optimization of micron sized lubricant oil droplet deposition on a hot plate

et al. 2015

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The deposition of micron sized lubricant oil droplets similar to oil droplets in blow-by gases of Internal combustion (IC) engines on a hot flat plate was studied using a round impinging jet configuration. Five parameters which simulate the different operational conditions in IC engines were chosen: The impaction nozzle's outlet diameter, additional air flow rate, plate angle, plate temperature, and nozzle to the plate distance. An Experimental test-rig was constructed to acquire deposit weight with different parameter values. To find the conditions of minimum deposition, the deposit's weight was optimized using the Taguchi design of experiment method with respect to the design parameters. Using the experimental data, the predicted optimal value of the deposit weight was confirmed. Analysis of variance showed that plate angle is the most influential factor in deposition of fine oil droplets. Scanning electron microscopy (SEM) was used to investigate the mechanism of deposition.

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Investigation of fine droplet generation from hot engine oil by impinging gas jets onto liquid surface

Cited by 11 publications

References 12 publications

Physical and Mathematical Modeling of Multiphase Flows in a Converter

Physical and Mathematical Modeling of Multiphase Flows in a Converter

Experimental and Numerical Investigation of the Efficiency and Pressure Drop of an Inertial Impactor with Variable Area

Taguchi optimization of micron sized lubricant oil droplet deposition on a hot plate

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