نتایج جستجو برای: acoustic streaming
تعداد نتایج: 105633 فیلتر نتایج به سال:
روش الحاقی یکی از روش های موثر در بهینه سازی آیرودینامیکی می باشد. مزیت این روش در این است که گرادیان تابع هدف (که تابعی از متغیرهای جریان و شکل بالواره می باشد) را به متغیرهای هندسی و متغیرهای الحاقی مرتبط می سازد و در محاسبه گرادیان تابع هدف دیگر تغییرات متغیرهای جریان دیده نمی شود. روش الحاقی را می توان به دو شکل پیوسته و گسسته بکار برد. روش گسسته هیچ مزیتی بر روش پیوسته ندارد و به کارگیری و...
Acoustic separation of suspension cells can be achieved by altering the properties cell medium. Cells different types then migrate in opposing directions sound field due to differences their relative density and compressibility with respect surrounding fluid. For near-zero acoustic contrast radiation force on becomes negligible, it is primary objective this paper study interplay radiation, stre...
Although lot streaming scheduling is an active research field, lot streaming flexible flow lines problems have received far less attention than classical flow shops. This paper deals with scheduling jobs in lot streaming flexible flow line problems. The paper mathematically formulates the problem by a mixed integer linear programming model. This model solves small instances to optimality. Moreo...
Biologically salient sounds, including speech, are rarely heard in isolation. Our brains must therefore organize the input arising from multiple sources into separate "streams" and, in the case of speech, map the acoustic components of the target signal onto meaning. These auditory and linguistic processes have traditionally been considered to occur sequentially and are typically studied indepe...
Microfluidic acoustophoretic cell/particle separation has gained significant interest recently. The motion of cells/particles in acoustophoretic separation is commonly analyzed by using a one-dimensional (1-D) analytical model in a "static" fluid medium, while the effects of acoustic streaming, viscous boundary layers, and 2-D/3-D geometries are usually not considered. This makes it challenging...
We present a numerical study of thermoviscous effects on the acoustic streaming flow generated by an ultrasound standing-wave resonance in a long straight microfluidic channel containing a Newtonian fluid. These effects enter primarily through the temperature and density dependence of the fluid viscosity. The resulting magnitude of the streaming flow is calculated and characterized numerically,...
Microactuation of free standing objects in fluids is currently dominated by the rotary propeller, giving rise to a range of potential applications in the military, aeronautic and biomedical fields. Previously, surface acoustic waves (SAWs) have been shown to be of increasing interest in the field of microfluidics, where the refraction of a SAW into a drop of fluid creates a convective flow, a p...
In part 21 of the tutorial series "Acoustofluidics--exploiting ultrasonic standing wave forces and acoustic streaming in microfluidic systems for cell and particle manipulation", we review applications of ultrasonic standing waves used for enhancing immunoassays and particle sensors. The paper covers ultrasonic enhancement of bead-based immuno-agglutination assays, bead-based immuno-fluorescenc...
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