Combining the advantages of droplet-based microfluidics and centrifugal driving, a method for centrifugally driving W/O droplets with spiral microchannel is proposed in this paper. A physical model droplet flow was established to study characteristics driven by force, kinematic analysis performed based on rigid body assumption. Then, theoretical formula rate obtained. The value compared actual ...

そこで本研究では、FFD の格子を自動生成し、オリジ ナルの FFD の柔軟性を保ちつつ、ユーザによる 3 次元 モデルの変形を支援する手法を提案する。我々の手法 は、まずモデルのバウンディングボックスを生成し、 それを初期格子とする。その初期格子から階層的に新 たな格子を生成することで、多重解像度格子という格 子集合を作り出し、ユーザがその中から目的に沿った 適切な格子、すなわち大域的な変形のための少数の制 御点を持つ格子や、局所的な変形のための変形対象領 域の形状をよく近似する格子を選択できるようにする。 さらに、変形前の格子だけでなく、ユーザによって変 形された格子から新たな格子の生成を行うことで、階 層的変形を行うことができる。階層的変形を用いるこ とで、格子をバウンディングボックスから再定義する ことなく、大域的な変形から局所的な変形、またはそ の逆といったようにモデルを階...

A modified model has been analytically developed to describe the induction time of an elliptic air bubble in contact with an elliptic hydrophobic oil droplet. The role of hydrophobicity was revealed in the slippage of liquid over the surfaces of bubble and droplet. In this condition, the analytical relationships for pressure distribution and consequently hydrodynamic resistance force through th...

A surfactant-coated droplet attached to a rough wall subjected shear flow is investigated using coupled lattice Boltzmann with the finite difference method, where contact angle hysteresis model introduced into method characterize surface roughness. The first verified by equilibrium of semi-circular setting on bottom plane. It then adopted explore surfactant role motion and deformation two repre...

A computational study of oblique binary viscoelastic droplet collisions is performed. The free surface is modeled by a Lagrangian moving-mesh interface tracking method which is validated against analytical solutions and experimental data for binary Newtonian droplet collisions. Interpolation error due to cell deformation is minimized with a local topological mesh adaptation algorithm. This meth...

During evolution, plants evolved various reactions to wounding. Fast wound sealing and subsequent healing represent a selective advantage of particular importance for plants growing in arid habitats. An effective self-sealing function by internal deformation has been found in the succulent leaves of Delosperma cooperi. After a transversal incision, the entire leaf bends until the wound is close...

A novel adaptive mesh refinement (AMR) strategy based on the moment-of-fluid (MOF) method for volume-tracking of evolving interfaces is presented. Moment-offluid method is a new interface reconstruction and volume advection method using volume fractions as well as material centroids. The mesh refinement criterion is based on the deviation of the actual centroid obtained by interface reconstruct...

We study experimentally and numerically the onset of tip streaming in an electrified droplet. The experiments show that, for a sufficiently small dimensionless conductivity, droplet apex oscillates before ejecting liquid jet. This effect is caused by limited charge transfer from bulk to interface. reduces electrostatic pressure at droplet's stretching tip, preventing ejection. reduction compens...

A novel adaptive mesh refinement (AMR) strategy based on momentof-fluid (MOF) method for volume-tracking evolving interface computation is presented. Moment-of-fluid method is a new interface reconstruction and volume advection method using volume fraction as well as material centroid. The mesh refinement criterion is based on the deviation of the actual centroid obtained by interface reconstru...

In the present study we investigate computationally the deformation of an elastic capsule in a rectangular microfluidic channel and compare it with that of a droplet. In contrast to the bullet or parachute shape in a square or cylindrical channel where the capsule extends along the flow direction, in a rectangular channel the capsule extends mainly along the less-confined lateral direction of t...