Bibin Mathew Jose Graduate Research Assistant Microfluidics and Interfacial Fluid Dynamics Laboratory Department of Mechanical Engineering Stony Brook University bibin.jose@stonybrook.edu

Research

My primary research interest lies in understanding the dynamics of two-phase flow in micro geometries. We use microfluidic technologies to generate an emulsion i.e. droplet phase in an external phase. The droplets are then transported through different micro-geometries to study the individual as well as their collective behavior. Recently, with the advent of Microfludics considerable progress has been made in the miniaturization of the fluidic systems. With miniaturization, the surface area to volume ratio increases and surface phenomena like wetting plays a crucial role determining the overall flow. Numerous examples of other interesting flows involving wetting and immiscible displacement of fluids can be observed in enhanced oil recovery, ground water hydrology, water-oil filtration, fuel cells etc. Microfluidic provides a suitable platform to design and conduct simple experiments to further the fundamental understanding of multiphase flows in microgeometries.

Dynamics of Partially Wetting Droplets in Square Microchannel.

The production and evolution of partially wetting droplets in microchannels is experimentally studied as a function of Capillary number. (i) The hysteretic partially wetting system is shown to exhibit a new mode of droplet formation, namely rivulet. Droplets of smaller size compared to the channel dimensions are ejected from the tip of a wetting tongue. (ii) Downstream from the formation, droplets show different regimes based on capillary number as wetting, thin film, thick film, and constant film thickness. The dynamic wetting effects are closely associated with the evolution of the thin film with capillary number. (iii) At low Capillary number, droplet adhere to the channel walls and provide nucleation sites for film breakage and the growth of a dewetting patch. (iv) The relative velocity of a wetting droplet in a square channel is modified with the presence of sharp corners and can behave as leaky pistons.

Arrangement of Viscous Droplets in Microfluidic Chamber

The dynamic assembly and coalescence of droplets is experimentally examined inside a two dimensional pore model. (i) Monodisperse trains of droplets enters a diverging/converging slit microfluidic chamber. (ii) On decelerating in the diverging section, droplets forms crystal-like structures by hydrodynamic coupling. The compact multi-layered flow arrangements in the chamber can be controlled by adjusting the initial spacing between the droplets in the square channel. (iii) Inside the chamber, the droplets can coalesce and alter the layered arrangements.Onset of droplet coalescence can be controlled by adjusting the droplet concentration and capillary number. The merging of two adjacent droplets cause local transient flows around the droplets triggering an avalanche of coalescence. Overall, this study shows that droplet interaction and coalescence phenomena can be manipulated by flow parameters.

• Droplet spreading in viscous oils
B.M. Jose and T. Cubaud, (In Preparation)


• Formation of corner droplets in microchannels
B.M. Jose and T. Cubaud, (In Preparation)


• Formation and dynamics of partially wetting droplets in square microchannels
B.M. Jose and T. Cubaud, RSC Advances, 4, 14962-70. (2014)


• Droplet arrangement and coalescence in diverging/converging microchannels
B.M. Jose and T. Cubaud, Microfluidics and Nanofluidics, 12, 687. (2012)


• Droplet breakup and viscosity-stratified flows in microchannels
T. Cubaud, B.M. Jose, S. Darvishi, and R. Sun, International Journal of Multiphase flow, 39, 29. (2012)


• Folded micro-threads: Role of viscosity and interfacial tension
T. Cubaud, B.M. Jose, and S. Darvishi, Physics of Fluids, 23, 042002. (2011)

• Ph.D. in Mechanical Engineering,
  Mechanical Engineering Department, Stony Brook University (2009-2014 [Expected])
  
  • Major: Thermal Sciences and Fluid Mechanics
  • Minor: Energy Technology

• B.Tech. in Mechanical Engineering,
  College of Engineering, University of Kerala,Trivandrum, India (2003-07)
  Project : Increasing efficiency of industrial refrigerators

• François Frenkiel Award for Fluid Mechanics
  (with Thomas Cubaud) American Physical Society - DFD (2012)
  
  
• Best Poster Award
  Annual Student Research Poster Symposium (2012)
  Department of Mechanical Engineering, Stony Brook University, NY
  
  
• Graduate Student Fellowship
  College of Engineering and Applied Sciences, Stony Brook University (2010 to 2014)
  
  
• Research Mentoring
  REU Program in Nanotechnology for Health, Energy and the Environment
  The National Science Foundation Research Experience for Undergraduates
  
  • Connor Gorman (Summer 2012)
  • Karen Dickens (Summer 2011)

• Graduate Research Assistant (2010 to 2014)
  Microfluidics and Interfacial Fluid Dynamics Laboratory,
  Department of Mechanical Engineering, Stony Brook University, NY
  Funded by: National Science Foundation
  
  
• Visitor (2011 to 2013)
  Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY
  • Clean room training
  • Used SEM for material characterization
    
    
• Teaching Assistant (Fall 2012, Fall 2010)
  Department of Mechanical Engineering, Stony Brook University, NY
  
  
  • MEC 364 - Introduction to Fluid Mechanics (Fall 2012)
    Held weekly recitations, graded homework and helped students with the one-on-one doubt clearing sessions
    
    
  • MEC 316 - Mechanical Engineering Lab I: Sensors and Instrumentation (Fall 2010)
    Graded student projects and lab reports.
    Supervised students to setup and conduct experiments.
    Helped multiple student groups to develop a flow meter interfacing with LabVIEW.
  
  

• B.M.Jose and T.Cubaud.“Formation and dynamics of partially non-wetting droplets in square microchannels” 66^thAnnual Meeting of the American Physical Society's Division of Fluid Dynamics, November 24-26, 2013, Pittsburgh, Pennsylvania.
  
• B.M.Jose and T.Cubaud.“Dynamics of Partially Wetting Droplets in Square Microchannels” North East Complex fluids and Soft Matter Workshop, October 25^th, 2013, Rutgers University,New Brunswick, New Jersey.
  
• B.M.Jose and T.Cubaud.“Formation of partially wetting droplets in square microchannels” 65^thAnnual Meeting of the American Physical Society's Division of Fluid Dynamics, November 18-20, 2012, San Diego, California.
  
• B.M.Jose and T.Cubaud.“Arrangement of high-viscosity droplets in diverging/converging microchannels” 63^rdAnnual Meeting of the American Physical Society's Division of Fluid Dynamics, November 21-23, 20110, Long Beach, Los Angeles, California.
  

• Formation and Dynamics of Partially Non-Wetting of Droplets in Microchannels
  B.M.Jose and T.Cubaud. Annual Student Research Symposium, May 10, 2013,
  Dept. of Mechanical Engineering, Stony Brook University.
  
• Dynamic Wetting of Microfluidic Droplets
  B.M.Jose and T.Cubaud. Annual Student Research Symposium, April 20, 2012,
  Dept. of Mechanical Engineering, Stony Brook University.
  
• A Microfluidic Garden
  Samira Darvishi, Bibin.M.Jose, T.Cubaud. American Physical Society, November 20-22, 2011, Baltimore, Maryland.
  
• Arrangement of Viscous Droplets in Microfluidic Chamber
  B.M.Jose and T.Cubaud. Annual Student Research Symposium, May 4, 2011,
  Dept. of Mechanical Engineering, Stony Brook University.
  

Flow assembly of droplets in a microfluidic chamber

• American Physical Society (APS)
• American Society of Mechanical Engineers (ASME)

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