Experimental study of nanoparticle transport and penetration efficiency on a sharp-bent tube (elbow connection)

Kwak, Dong Bin; Kim, Seong Chan; Lee, Handol; Pui, David Y.H.

doi:10.1016/j.ijheatmasstransfer.2020.119816

Cited by 9 publications

(3 citation statements)

References 61 publications

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“…Here, the correlation of the drag coefficient (CD) (Hinds, 1982) and slip correction factor (Cc) (Kwak et al, 2020(Kwak et al, , 2021b(Kwak et al, , 2023Kim et al, 2005) can be calculated as ( )…”

Section: Characteristics Of Saliva Airborne Lifetimementioning

confidence: 99%

Saliva Droplet Evaporation Experiment and Simple Correlation of Evaporation-falling Curve under Different Temperatures and RH

Kwak

Fischer

Pui

2023

Aerosol Air Qual. Res.

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Section: Characteristics Of Saliva Airborne Lifetimementioning

confidence: 99%

Saliva Droplet Evaporation Experiment and Simple Correlation of Evaporation-falling Curve under Different Temperatures and RH

Kwak

Fischer

Pui

2023

Aerosol Air Qual. Res.

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“…Due to technological advances in various industries, aerosol transport tracking studies have gained great attention. For example, in the semiconductor industry, it is indispensable to carefully control the particle contamination and figure out the contamination source location to improve the production yields and quality due to reduced minimum pitch size in semiconductor products [ [35] , [36] , [37] , [38] ]. In order to experimentally verify the particle deposition location, fluorescent particles or droplets have been employed.…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of droplet deposition produced by an electrostatic sprayer on a classroom table by using fluorescent tracer

Kwak

Kim

Kuehn

et al. 2021

Building and Environment

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Due to the ongoing COVID-19 pandemic situation, measures to mitigate the risk of transmission of the SARS-CoV-2 virus in an indoor setting are urgently needed. Among the various types of disinfectant methods, electrostatic spraying is often applied to decontamination in public places. For quantitatively characterizing electrostatic spraying, we developed the novel evaluation method by using a fluorescent tracer. By applying this method, we performed three different experiment cases (static test on a table, static test on a cylinder, and dynamic test on a table) to figure out its unique characteristics (Coulombic fission and wraparound effect) and measure its performance in various aspects. To be specific, bimodal distribution with peak sizes of ∼10 and ∼100 μm was found due to Coulombic fission. Otherwise, a unimodal distribution with a peak size of ∼100 μm occurred for the uncharged droplets. As a result, the effective contact area increased by 40–80 % due to small progeny droplets. The wraparound effect was examined on two different cylinders: copper (Cu) and polyvinyl chloride (PVC) pipe. When the target surface was not charged (Cu 0 kV and PVC 0 kV), the average normalized concentrations on the backside of the cylinder ( θ = 180°) increased by around 67 % for charged droplets. Meanwhile, when the target surface was highly charged (PVC –19 kV), the average normalized concentrations at θ = 180° were increased more than two times for charged droplets.

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“…Over the past decades, it has been found that nanoparticles acting as additives could significantly improve the thermal properties of base fluids [1][2][3]. Beyond this, the tribological performance of nanofluids also attracted our attention for indepth study.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Tribological Properties of Oil-Based Flake WS<sub>2</sub>-Oleic Acid Lubricant on Steel-Brass Sliding Contact

et al. 2020

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The current research focused on the tribological properties of flake-like WS 2 particles dispersed into PAO 4 base oil with oleic acid as surfactant. Various concentrations of 0.2 mass%, 1 mass% and 3 mass% were applied in the preparation of WS 2 -OA lubricant. The wear tests were carried out using a ball-on-plate reciprocating sliding test configuration. It was found that the highest COF of 0.578 was obtained using PAO 4 base oil with significant fluctuations. The COF could be reduced to approximately 0.34 and stabilized after adding the OA. When introducing the WS 2 articles, the COF was around 0.158 under 0.2 mass%, 0.143 under 1 mass% and 0.145 under 3 mass%, and became almost constant after 4 min. In addition, the highest wear rate in width of 61.5 µm/m and in depth of 2.2 µm/m was found using PAO 4 base oil. The wear rate can be reduced to 51.6 µm/m in width (16.1%) and 0.9 µm/m (59.1%) in depth under 3 mass% OA. While using the WS 2 particles, the wear rate in width could be further reduced to 45.2 µm/m using 1 mass% but with slightly higher wear rate in depth than that of OA. Based on the analysis in SEM and EDX, the abrasive grooves became less after introducing the OA, some dark spots composed of carbon acted as tribo-films on the worn area. While using WS 2 particles, it could be found that WS 2 flakes were adhered on the surfaces to reduce the friction and wear.

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Experimental study of nanoparticle transport and penetration efficiency on a sharp-bent tube (elbow connection)

Cited by 9 publications

References 61 publications

Saliva Droplet Evaporation Experiment and Simple Correlation of Evaporation-falling Curve under Different Temperatures and RH

Saliva Droplet Evaporation Experiment and Simple Correlation of Evaporation-falling Curve under Different Temperatures and RH

Quantitative analysis of droplet deposition produced by an electrostatic sprayer on a classroom table by using fluorescent tracer

Assessment of Tribological Properties of Oil-Based Flake WS<sub>2</sub>-Oleic Acid Lubricant on Steel-Brass Sliding Contact

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