Browsing by Subject "Lagrangian tracking method"
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Item Open Access Modeling of dielectrophoretic particle motion: Point particle versus finite‐sized particle(Wiley - V C H Verlag GmbH & Co. KGaA, 2017-02-06) Çetin B.; Öner, D. S.; Baranoğlu, B.Dielectrophoresis (DEP) is a very popular technique for microfluidic bio‐particle manipulation. For the design of a DEP‐based microfluidic device, simulation of the particle trajectory within the microchannel network is crucial. There are basically two approaches: (i) point‐particle approach and (ii) finite‐sized particle approach. In this study, many aspects of both approaches are discussed for the simulation of direct current DEP, alternating current DEP, and traveling‐wave DEP applications. Point‐particle approach is implemented using Lagrangian tracking method, and finite‐sized particle is implemented using boundary element method. The comparison of the point‐particle approach and finite‐sized particle approach is presented for different DEP applications. Moreover, the effect of particle–particle interaction is explored by simulating the motion of closely packed multiple particles for the same applications, and anomalous‐DEP, which is a result of particle–wall interaction at the close vicinity of electrode surface, is illustrated.Item Open Access Modeling of inertial particle flow and entry gas flow in micro-channels(Bilkent University, 2017-01) Rasooli, RezaMicro uidics is integration of micro-fabrication techniques together with the knowledge of ow behavior at micro scale to design and achieve particle manipulation, separation, sorting and etc. which is important for biomedical and biological applications. In this regard, analytical and numerical analysis and modeling play an important substantial role and serve as a basis for further and better understanding of basic and fundamental concepts and create a more transparent picture for an optimized design with desired properties. In the present thesis, behavior of both liquid type and gas type working uid have been studied. For the liquid ow, nite Reynolds number ow regimes which is also known as inertial micro uidics has been considered. Inertial micro uidics have exhibited promising and rigorous abilities in size based particle separation due to existence of inertial lift force and secondary ow (for curved channels). For the gas ow, governing equations of an incompressible and isothermal ow have been analytically solved using a linearization technique proposed in the literature for the hydrodynamic entrance region due to its importance for excess pressure drop and heat transfer. For this purpose, simulation of particle focusing using Lagrangian particle tracking method has been carried out for both straight and spiral micro-channel. For simulation authentication, experimental investigation have also performed and compared with the simulation upshots.