000255978 001__ 255978
000255978 005__ 20190317001005.0
000255978 0247_ $$2doi$$a10.1039/C7LC01283G
000255978 02470 $$2DOI$$a10.1039/C7LC01283G
000255978 037__ $$aARTICLE
000255978 245__ $$aInertial manipulation of bubbles in rectangular microfluidic channels
000255978 260__ $$c2018-03-07
000255978 269__ $$a2018-03-07
000255978 336__ $$aJournal Articles
000255978 520__ $$aInertial microfluidics is an active field of research that deals with crossflow positioning of the suspended entities in microflows. Until now, the majority of the studies have focused on the behavior of rigid particles in order to provide guidelines for microfluidic applications such as sorting and filtering. Deformable entities such as bubbles and droplets are considered in fewer studies despite their importance in multiphase microflows. In this paper, we show that the trajectory of bubbles flowing in rectangular and square microchannels can be controlled by tuning the balance of forces acting on them. A T-junction geometry is employed to introduce bubbles into a microchannel and analyze their lateral equilibrium position in a range of Reynolds (1 < Re < 40) and capillary numbers (0.1 < Ca < 1). We find that the Reynolds number (Re), the capillary number (Ca), the diameter of the bubble ([D with combining macron]), and the aspect ratio of the channel are the influential parameters in this phenomenon. For instance, at high Re, the flow pushes the bubble towards the wall while large Ca or [D with combining macron] moves the bubble towards the center. Moreover, in the shallow channels, having aspect ratios higher than one, the bubble moves towards the narrower sidewalls. One important outcome of this study is that the equilibrium position of bubbles in rectangular channels is different from that of solid particles. The experimental observations are in good agreement with the performed numerical simulations and provide insights into the dynamics of bubbles in laminar flows which can be utilized in the design of flow based multiphase flow reactors.
000255978 536__ $$aH2020$$cSIMCOMICS 280117
000255978 700__ $$aHadikhani, Pooria
000255978 700__ $$aHashemi, S. Mohammad H.
000255978 700__ $$aBalestra, Gioele
000255978 700__ $$aZhu, Lailai
000255978 700__ $$aModestino, Miguel A.
000255978 700__ $$aGallaire, François
000255978 700__ $$aPsaltis, Demetri
000255978 773__ $$j18$$k7$$q1035-1046$$tLab on a Chip
000255978 790__ $$2url$$whttp://pubs.rsc.org/en/content/articlehtml/2018/lc/c7lc01283g
000255978 8560_ $$fsilke.jan@epfl.ch
000255978 8564_ $$s5647126$$uhttps://infoscience.epfl.ch/record/255978/files/c7lc01283g%281%29.pdf$$zPOSTPRINT
000255978 909C0 $$0252358$$mmathias.nagel@epfl.ch$$pLFMI$$xU12052
000255978 909C0 $$0252333$$msilke.jan@epfl.ch$$pLO$$xU11723$$yApproved
000255978 909CO $$ooai:infoscience.epfl.ch:255978$$pSTI$$particle$$qGLOBAL_SET
000255978 960__ $$agioele.balestra@epfl.ch
000255978 961__ $$afantin.reichler@epfl.ch
000255978 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000255978 980__ $$aARTICLE
000255978 981__ $$aoverwrite