Akustik Işıma Kuvvetiyle Milimetre Boyutundaki Katı Parçacıkların Tuzaklanması ve Ayrıştırılması

Akustik ışıma kuvvetlerinden faydalanarak hava ortamında mm boyutundaki parçacıkların tuzaklanması ve manipülasyonu son zamanlarda yoğun ilgi gören çalışma alanlarından biridir. İki boyutlu fononik kristallerin çizgisel kusur durumları ile akustik ışıma kuvvetinden faydalanılarak havada mm boyutunda katı parçacıkların akustik metamalzeme mercekler ile manipülasyonu ve boyutlarına göre ayrıştırılması sayısal hesaplamalar ile gösterilmiştir. Bu yapılırken, Sonlu Elemanlar Yöntemiyle simülasyon hesabı yapılarak fononik kristallerin band yapıları elde edilmiştir. Çalışmada iki boyutlu fononik kristal ile oluşturulan bir dairesel halka çınlaçta yerçekimi ve akustik ışıma kuvvetlerinin birlikte etkisi ile küresel parçacıkların dairesel yörüngede hareketi sağlanmıştır. Hesaplamalarda 0.25 mm, 0.4 mm ve 0.55 mm çaplı polistiren küreciklerin hareketi t=0, 50, 100, 150, 200 ve 400 ms deki konumları incelenmeştir. Bütün parçacıklar dairesel düğüm çizgisini izleyerek belirtilen sürelerde yörüngenin yaklaşık olarak ¼, ½, ¾ ve 1 oranındaki kısımlarını kat etmişlerdir. t=400 ms anında 0.55 mm çaplı parçacık yaklaşık olarak iki turu tamamlarken, diğer parçacıklar sürüklenme kuvvetinden dolayı çizgisel hızlarını kaybetmekte ve düğüm çizgisinin en alt noktasında ayrışarak tuzaklanmaktadır.

Anahtar Kelimeler:

Fononik kristal, Parçacık tuzaklama, Parçacık ayrıştırma., Akustik ışıma kuvveti

Trapping and Separation of Solid Particles with the Size of Millimeters by Acoustic Radiation Force

Trapping and manipulating mm-sized particles in the air by utilizing acoustic radiant forces are one of the fields of study that have recently attracted great interest. By using the linear defect states of the two-dimensional phononic crystals and the acoustic radiation force, the manipulation of the mm-sized solid particles in the air with acoustic metamaterial lenses and their separation according to their size have been shown by numerical calculations. While doing this, the band structures of the phononic crystals were obtained by simulation calculation with the Finite Element Method. In the study, the movement of spherical particles in a circular orbit was ensured by the combined effect of gravity and acoustic radiation forces in a circular ring resonant formed with a two-dimensional phononic crystal. The calculations examined the motion of the 0.25 mm, 0.4 mm and 0.55 mm diameter polystyrene spheres and their positions at t=0, 50, 100, 150, 200, and 400 ms. All the particles followed the circular nodal line and traversed approximately ¼, ½, ¾, and 1 part of the orbit in the indicated times. At t=400 ms, the 0.55 mm diameter particle completes approximately two turns, while the other particles lose their linear velocity due to the drag force and are trapped at the lowest point of the nodal line.

Keywords:

Acoustic radiation force, Phononic crystal, Particle trapping, Particle separation,

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