Mıknatıslanmış Granül Dolgulu Yataklarda Submikron Parçacıklarının Yakalanması

Yıl 2020, Cilt: 8 Sayı: 1, 131 - 140, 23.03.2020

Teoman Karadağ

https://doi.org/10.29109/gujsc.641444

Öz

Dış
homojenik manyetik alanda mıknatıslanmış ve teğetleşmiş ferromanyetik kürelerin
oluşturduğu gradyantlı manyetik alanda mikron ve submikron boyutlu
parçacıkların difüzyon separasyonu olayı teorik olarak incelenmiştir.
Mıknatıslanmış kürelerin teğet noktaları etrafında oluşan gradyantlı alanda
submikron boyutlu parçacığa etkiyen manyetik kuvvet ifadesinden gidilerek
difüzyon denkleminin kararlı durumlar için analitik çözümü elde edilmiş ve
parçacıkların bu bölgelerdeki konsantrasyon dağılımı belirlenmiştir. Sistemin
manyetik, hidrodinamik, ısı ve geometrik parametreleri dikkate alınarak
difüzyon olunan parçacıkların kritik boyutlarını değerlendirmek için analitik
formül geliştirilmiştir. Elde edilen sonuçlara göre dış manyetik alanın
artmasıyla parçacıkların kritik boyutlarının azaldığı gözlenmiştir. Bu düşüşün
parçacıkların tek domenli yapısına kadar olabileceği vurgulanmıştır. Analitik
hesaplamalara göre parçacıkların kritik boyutlarının kürelerin boyutlarından
bağımsız olduğu görülmüştür. Ancak ferromanyetik kürelerin oluşturduğu
gradyantlı manyetik alanda oluşan difüzyon olaylarında parçacıkların kritik
boyutlarının matris elemanları olan kürelerin boyutlarından bağımsız olduğu
sonucunun tartışılabilir olduğu söylenmiştir. 

Anahtar Kelimeler

YGMS, Difüzyon, Manyetik Parçacıklar

Kaynakça

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