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Microplastic / Microfluidic device / Filtration
Microplastic particle trapping through microfluidic devices with different shaped pillars
A. Kitagawa, M. Ota, T. Watamura, T. Tonooka, Y. Murai
Chemical Engineering Science 264, 118163 (2022) [Link] 

Distributions of flow angles to pillar surface (top) and trapped-particle concentration (bottom) 

Cross-flow transport / Hydrophobic strip / Turbulent channel flow
Entrapment and cross-flow transport of air bubbles by a hydrophobic strip in a turbulent channel flow
A. Kitagawa, P. Denissenko, Y. Murai
Experiments in Fluids 62, 198 (2021) [Link]
 
Image of bubbles on test plate

Drag reduction / Air-filled superhydrophobic groove
Transient velocity profiles and drag reduction due to air-filled superhydrophobic grooves
A. Kitagawa, Y. Shiomi, Y. Murai, P. Denissenko
Experiments in Fluids 61, 237 (2020) [Link]
 
Images of air–water interfaces formed in grooves

Air-bubble behavior / Surface wettability
Behavior of bubbles moving along horizontal flat plates with different surface wettability
A. Kitagawa, P. Denissenko, Y. Murai
Experimental Thermal and Fluid Science 104, 141-152 (2019) [Link]
 
Bubble images for hydrophilic (HPI) and hydrophobic (HPO) plates

Natural convection / Heat transfer enhancement / Bubble injection
Convection heat transfer enhancement of a vertically heated surface via rising bubbles in graphene oxide (GO) nanofluid
L.T. Siow, J.R. Lee, A. Kitagawa, E.H. Ooi, E.V. Lau
International Journal of Heat and Mass Transfer 252, 127450 (2025) [Link]

Natural convection heat transfer enhancement using bubble injection between vertical parallel plates
A. Kitagawa, R. Kobayashi, P. Denissenko, Y. Murai
International Journal of Heat and Mass Transfer 202, 123658 (2023) [Link]

Effect of heated wall inclination on natural convection heat transfer in water with near-wall injection of millimeter-sized bubbles
A. Kitagawa, P. Denissenko, Y. Murai
International Journal of Heat and Mass Transfer 113, 1200-1211 (2017) [Link]
 
Flow visualization using fluorescent dye