Sharif University of Technology Scientia Iranica 1026-3098 32 2 2025 01 01 The variations of breakup and non-breakup regions for ferrofluid microdroplets in T-junctions with a proposed correlation 23658 10.24200/sci.2024.57207.5113 EN Mohammad Aboutalebi Department of Mechanical Engineering, Sharif University of Technology, P. O. BOX: 11155_9567, Tehran, Iran Omid Adibi Energy and Environment Research Center, Energy Management Group, Niroo Research Institute, Tehran, Iran Mohamad Ali Bijarchi Department of Mechanical Engineering, Sharif University of Technology, P. O. BOX: 11155_9567, Tehran, Iran Mohammad Behshad Shafii Department of Mechanical Engineering, Sharif University of Technology, P. O. BOX: 11155_9567, Tehran, Iran 0000-0002-6266-8853 Siamak Kazemzadeh Hannani Department of Mechanical Engineering, Sharif University of Technology, P. O. BOX: 11155_9567, Tehran, Iran Journal Article 2020 11 20 Lots of attention has been paid to microfluidic and nanofluidic instruments in recent decades. One of the interesting instruments in this field that has attracted scientists is T-junctions. This paper reports an empirical study on the variation of breakup and non-breakup regions for ferrofluid microdroplets in symmetrical T-junctions under an asymmetrical magnetic field in the center of the junction. The asymmetrical magnetic field was generated using a permanent magnet on the right side of the T-junction. During the tests, ferrofluid microdroplets with different lengths and various velocities were entered into the T-junction and were influenced by an asymmetrical magnetic field. Results show that the increment in the magnetic flux density causes a higher possibility of non-breakup for ferrofluid microdroplets. Therefore, the breakup and non-breakup region in the diagram of non-dimensional length versus Ca number shifts upward. On the other hand, it was observed that the increment in Ca number is a key factor in breaking the microdroplets in the T-junction. Finally, a correlation was proposed to predict the breakup and non-breakup region due to different amounts of magnetic flux density and Ca number. https://scientiairanica.sharif.edu/article_23658_3dbc90009331b671586e5f586ad05bf8.pdf