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The microfluidic system was fabricated with lithography technique. The 3D simulation was performed based on COMSOL software using level set method. The size of droplet is inversely proportional to the flow rate of continuous phase according to exponential function, linearly proportional with the flow rate of dispersed phase, and the width of lateral channel decrease. | Communications in Physics, Vol. 28, No. 3 (2018), pp. 225-235 DOI:10.15625/0868-3166/28/3/12530 FORMATION OF MICRODROPLET IN T-JUNCTION MICROFLUIDIC SYSTEM: EXPERIMENT AND SIMULATION NGUYEN THI THAIa , CHU THI XUANa,† , PHAM DUC THANHa , NGUYEN PHUONG NHUNGb AND MAI ANH TUANc a International Institute for Materials Science, Hanoi University of Science and Technology, Hanoi, Vietnam b Petro Vietnam University, 672 Cach Mang Thang Tam, Long Toan Ward, Ba Ria city, Ba Ria Vung Tau Province c National Center for Technological Progress (NACENTECH), 25 Le Thanh Tong, Hanoi, Vietnam † E-mail: xuan@itims.edu.vn Received 23 April 2018 Accepted for publication 26 June 2018 Published 31 August 2018 Abstract. The purpose of this study is to investigate the formation of the water droplet in oil using T-junction microfluidic device. Both numerical and experimental methods have been implemented to investigate the dependence of droplet size versus the flow rate of two immiscible liquids as well as the system geometry. The microfluidic system was fabricated with lithography technique. The 3D simulation was performed based on COMSOL software using level set method. The size of droplet is inversely proportional to the flow rate of continuous phase according to exponential function, linearly proportional with the flow rate of dispersed phase, and the width of lateral channel decrease. While the decreasing of the width of the lateral channel gives rise to the increasing of droplet velocity, the velocity of droplet depends linearly on the flow rate of disperse phase. A good consistence was observed between the theory and the experiment. Keywords: COMSOL Multiphysics, Microdroplet, T-junction microfluidic system. Classification numbers: 47.80.Cb, 85.40.Hp, 47.15.-x. c 2018 Vietnam Academy of Science and Technology 226 NGUYEN THI THAI et al. I. INTRODUCTION Droplet microfluidic with faster reaction rate, less cross-infection and reduced sample volume, has been growing strongly .
