國立虎尾科技大學 |

Effect of Channel Geometry on Alternating Droplet Generation = Kanal Geometrisinin Değişmeli Damlacık Üretimine Etkisi /

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Effect of Channel Geometry on Alternating Droplet Generation/ Muhammad Saqib.
其他題名:	Kanal Geometrisinin Değişmeli Damlacık Üretimine Etkisi /
作者:	Saqib, Muhammad,
面頁冊數:	1 electronic resource (77 pages)
附註:	Source: Masters Abstracts International, Volume: 83-10.
Contained By:	Masters Abstracts International83-10.
標題:	Design. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29047355
ISBN:	9798209973379

Effect of Channel Geometry on Alternating Droplet Generation = Kanal Geometrisinin Değişmeli Damlacık Üretimine Etkisi /
Saqib, Muhammad,

Effect of Channel Geometry on Alternating Droplet GenerationKanal Geometrisinin Değişmeli Damlacık Üretimine Etkisi / [electronic resource] =Muhammad Saqib. - 1 electronic resource (77 pages)

Source: Masters Abstracts International, Volume: 83-10.

Droplet based micro uidics has been one of the popular topics in micro udics research for the past two decades due to several advantages which include: less amount of reagent (sample) being used, enhanced mixing in the drops due to chaotic advection, low thermal mass and large surface to volume ratio which results in e cient heat transfer and encapsulation of reagents in droplets. Producing droplets from two sources inside the same micro-channel has been attempted by several research groups with great success and it carries great signi cance due to its applications in chemical synthesis, biological analysis and targeted drug delivery. While there are geometries available to produce synchronized alternating droplets, the mechanism of alternation in such device has not been studied. In this work a cross junction device (also known as a double T-junction device)is used; and the e ect of the taper angle of the side inlet channels on the continuous generation of an alternating pattern is studied. It was found that a higher value of the taper angle results in more e cient and constantly repeating alternating pattern of droplets from the two sources. This study includes the statistical analysis of the experimental data to compare the performance of devices with di erent taper angles for side channels. Moreover the experimental data is used to measure the radii of curvature at the instant of break o and used to calculate the Laplace pressure drop across the junction which enables us to compare the total pressure drop across the junction for devices with di erent taper angle values. Using the total pressure drop it was concluded that the hydraulic resistance of the side inlet channels is the key factor in synchronized alternating droplet pattern generation. In order to con rm the calculated values, a computational study is also performed which further substantiates the theory. Furthermore, using the tapered channel devices, di erent patterns are generated that are referred to as barcodes, by employing di erent ow rate combinations at the dispersed phase inlets. Finally it was showed how to generate barcodes composed of droplets with di erent and same viscosity. The signi cance of being able to generate di erent patterns is related to being able to separately identify droplets from each sources while using automation in the system since the droplet size and spacing remains uniform.

English

ISBN: 9798209973379Subjects--Topical Terms:

595500
Design.

Effect of Channel Geometry on Alternating Droplet Generation = Kanal Geometrisinin Değişmeli Damlacık Üretimine Etkisi /
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520 # $a Droplet based micro uidics has been one of the popular topics in micro udics research for the past two decades due to several advantages which include: less amount of reagent (sample) being used, enhanced mixing in the drops due to chaotic advection, low thermal mass and large surface to volume ratio which results in e cient heat transfer and encapsulation of reagents in droplets. Producing droplets from two sources inside the same micro-channel has been attempted by several research groups with great success and it carries great signi cance due to its applications in chemical synthesis, biological analysis and targeted drug delivery. While there are geometries available to produce synchronized alternating droplets, the mechanism of alternation in such device has not been studied. In this work a cross junction device (also known as a double T-junction device)is used; and the e ect of the taper angle of the side inlet channels on the continuous generation of an alternating pattern is studied. It was found that a higher value of the taper angle results in more e cient and constantly repeating alternating pattern of droplets from the two sources. This study includes the statistical analysis of the experimental data to compare the performance of devices with di erent taper angles for side channels. Moreover the experimental data is used to measure the radii of curvature at the instant of break o and used to calculate the Laplace pressure drop across the junction which enables us to compare the total pressure drop across the junction for devices with di erent taper angle values. Using the total pressure drop it was concluded that the hydraulic resistance of the side inlet channels is the key factor in synchronized alternating droplet pattern generation. In order to con rm the calculated values, a computational study is also performed which further substantiates the theory. Furthermore, using the tapered channel devices, di erent patterns are generated that are referred to as barcodes, by employing di erent ow rate combinations at the dispersed phase inlets. Finally it was showed how to generate barcodes composed of droplets with di erent and same viscosity. The signi cance of being able to generate di erent patterns is related to being able to separately identify droplets from each sources while using automation in the system since the droplet size and spacing remains uniform.
520 3 $a Mikro akışkan araştırmasında, damlacık tabanlı mikro akışkanlar, birkaç avan- tajından dolayı 20 yıldır gündemde olan konulardan birisidir. Bu avantajlar- dan bazıları: Daha az miktarda reaktif (mumune) kullanılması, kaotik yapışma, düşük termal kütle ve verimli isı transferine ek olarak damlalardaki reakti- flerin kapsüllenmesiyle sonuçlanan büyük yüzey hacim oranıdır. Aynı mikro kanalın içindeki iki kaynaktan damlacıklarım üretilmesi, büyük bir başarı ile birkaç araştırma grubu tarafından denendi ve kimyasal sentez, biyolojik analiz ve hedefe yönelik ilaç verilmesi uygulamaları nedeniyle büyük önem taşıyor. Senkronize edilmiş alternatif damlacıklar üretmek için meveut geometriler olsa da, bu tür ci- hazlarda geometriksel dönüişüm mekanizması çalışılmamıştır. Bu çalışmada, bir çapraz bağlantı cihazı (çift T-bağlantı cihazı olarak da bilinir) kullanırız ve bu cihazın iç yan kanallarının koniklik açısını değiştirerek, değişen modelin sürekli üretilen alternatif desenli damlacıklardaki etkisini inceleriz. Yan kanallar ve konik açımın daha yüksek değerde olması, iki kaynaktan gelen damlacıkların daha ver- imli ve sürekli olarak tekrarlanan modelin oluşmasını sonuç verir. Bu çalışma, yan kanallar için farklı koniklik açıları olan cihazların performansımı karşılaştırmak için deneysel verilerin istatistiksel analizini içermektedir. Ek olarak; deney- sel veriler, kopma anmda eğrilik yarıçaplarımı ölçmek ve birleşme noktasındaki Laplace basınç düşüşünü hesaplamak için de kullamılır; bu da, farklı koniklik açısı değerlerine sahip cihazlar için birleşme noktası boyunca toplam basınç düşüşünü karşılaştırmamızı sağlar. Toplam basınç düşüşünü kullanarak, yan giriş kanal- larının hidrolik direncinin senkronize alternatif damlacık modeli oluşturmada anahtar faktör olduğu sonucuna vardık. Hesaplanan değerleri doğrulamak için, teoriyi daha fazla tasdik eden bir hesapsal çalışma da yapılır. Ayrıca, konik kanallı cihazlar ve dağıtılmış faz girişlerinde farklı akış hızı kombinasyonları kul- lanılarak, barkod olarak adlandırılan farklı desenler üretiyoruz. Son olarak, farklı ve aynı viskozitedeki barkodların nasıl üretildiğini gösterdik. Farklı de- senler üretebilmenin önemi, damlacık boyutu ve aralıkları tekdüze kaldığı için, sistemde otomasyon kullanılırken dahi, her kaynaktan gelen damlacıkların ayrı ayrı tanımlanabilmesinden gelmektedir.
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