İS (SİYAH KARBON) TOPAKLANMALARINDA YAPISAL DURUMLARIN IŞINIM ÖZELLİKLERİNE ETKİLERİ

Yıl 2017, Cilt: 22 Sayı: 1, 125 - 138, 27.04.2017

Nimeti Döner

https://doi.org/10.17482/uumfd.309456

Öz

Yanma ürünü olan is (siyah karbon) parçacıkları topaklanarak atmosfere
yayılırlar. Kanserojene yol açan (PAH) molekül içermeleri nedeniyle
toksikolojik etkilere sahiptirler ve ışınım özelliklerinin artması nedeniyle
global ısınmaya güçlü etkilerinin olduğu bilinmektedir. Bu çalışmada, siyah
karbon topaklanmalarının ışınım özelliklerine topaklanma yapısının ve
büyüklüğünün etkileri, Discrete Dipole Approximation (DDA) yöntemi ile analiz
edilmiştir. N = 200 parçacıktan
oluşan iki ayrı yapıdaki topaklanma örneği 0.532 ve 1.064 μm dalga boylarında
ışınım saçılımı açısından incelenmiştir. Her iki topaklanma yapısı, üç farklı
yapısal durumda yani parçacıklar nokta temaslı, iç içe geçmiş ve topaklanmanın
hacimsel büyütülmüş durumları için topaklanmaların ışınım özellikleri
hesaplanmıştır. Yapılan analizlerden, is topaklanmalarının ışınım
özelliklerinin topaklanma hacim eşdeğer yarıçapları ve incelenen dalga boyundan
oldukça etkilendiği görülmüştür. Parçacık temaslı topaklanma genişlemesi ile
parçacıkları iç içe geçen topaklanmaların ışınım özelliklerinin aynı değerlere
sahip olduğu saptanmıştır.

Anahtar Kelimeler

ışınım özellikleri, siyah karbon, is topaklanmaları, polarizasyon, DDA

Effects of Morphology on the Radiative Properties of Fractal Soot Aggregates

Öz

The soot (black carbon) particles which are
produced by combustion emits into atmosphere in forms of aggregates. The
aggregates contain of PAH molecules that are causing carcinogens have
toxicological effects. It is well known that soot aggregates which are enlarged
of radiative properties effect on global warming. In this study, the impact of
morphology on the radiative properties of fractal soot aggregates was
investigated using the discrete dipole approximation (DDA). The radiative
properties of aggregates of N = 200
primary particles were numerically evaluated at 0.532 and 1.064 μm wavelength.
The radiative properties of three different cases, formed by point-touching,
overlapping and aggregate expansion for soot aggregates were calculated. The effects
of radiative properties of soot aggregates vary strongly with the volume
equivalent radius a_eff and
wavelength. It was found that the expansion of aggregates has the same effect
on radiative properties as overlapping.

Anahtar Kelimeler

Radiative properties, black carbon, fractal soot aggregates, polarization, DDA

Kaynakça

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