Droplet Formation in a Microchannel T-Junction With Different Step Structure Position

Author:

Abdollahzadeh Jamalabadi Mohammad Yaghoub12,Kazemi Rasoul3,Ghalandari Mohammad45

Affiliation:

1. Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam;

2. Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam

3. Department of Mechanical Engineering, Polytechnic University of Catalonia, Barcelona, Spain

4. Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam;

5. Faculty of Electrical-Electronic Engineering, Duy Tan University, Da Nang 550000, Vietnam

Abstract

Abstract In this study, numerical simulation of formation of droplet within T-shaped microchannel is investigated. Three-dimensional, transient and two-phase numerical solution for four different microchannels with different stepping positions in the flow path was performed. Various parameters such as volume fraction, Nusselt number, pressure, Reynolds number, and temperature are discussed. The results show that the location of stepped barriers in the flow path affects the process of droplet formation, its number and size in the microchannel and should be considered as an important factor in determining the fluid behavior in the microchannel. It was observed that by placing half of the step at the entrance and the other half after the entrance, the continuous phase (S3 mode) was formed in 37.5 s compared to the other modes. The droplets were also smaller in size and more in numbers. It was also observed that the maximum value for the Nusselt number was obtained for the S2 mode where the step was located just above the discrete-phase entrance. In addition, the pressure at the inlet was higher and the flow velocity increased after the step and its pressure decreased, and continued to decrease due to frictional path.

Publisher

ASME International

Subject

Geochemistry and Petrology,Mechanical Engineering,Energy Engineering and Power Technology,Fuel Technology,Renewable Energy, Sustainability and the Environment

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