Academic Qualification

Ph.D. Research Scholar, Jan 2015-Nov2020

Topic: Experimental and Computational Study of Spreading and Evaporation of a Droplet on Microtextured and Smooth Solid Surfaces

Advisor: Prof. Rajneesh Bhardwaj

Department of Mechanical Engineering

Indian Institute of Technology Bombay, Mumbai, India

Master of Technology (M. Tech.) in Thermal Engineering (CFD & HT), Year- 2011-13

National Institute of Technology Hamirpur, Hamirpur, India

Bachelor of Technology (B. Tech.) in Mechanical Engineering, Year- 2007-11

Noida Institute of Engineering and Technology, Greater Noida, G.B. Nagar, India

Research Interest:

• Interfacial transport phenomena

• Computational modeling: Code development and application

• Droplets: Evaporation, Coalescence, Wetting and impact dynamics

• Surface Engineering: Micro and nano-textured surfaces

• Bio-mimicking of natural surfaces

• Multiphase microfluidics

• Fluid structure interaction

• Renewable energy

• Computational Fluid Dynamics and Heat Transfer

Research Outcome:

Journal papers:

1. M. Kumar, R. Bhardwaj and K. C. Sahu, “Wetting Dynamics of a Water Droplet on Micro-pillar Surfaces with Radially Varying Pitches”, Langmuir, 2020. DOI: https://doi.org/10.1021/acs.langmuir.0c00697

2. S. Chatterjee, M. Kumar, J. S. Murallidharan and R. Bhardwaj, “Evaporation of Initially Heated Sessile Droplets and the Resultant Dried Colloidal Deposits on Substrates Held at Ambient Temperature”, Langmuir, 2020. DOI: https://doi.org/10.1021/acs.langmuir.0c00756

3. M. Kumar and R. Bhardwaj, “Wetting characteristics of Colocasia esculenta (taro) leaf and a bioinspired surface thereof ”, Scientific Reports, 2020. DOI: https://doi.org/10.1038/s41598-020-57410-2

4. M. Kumar, R. Bhardwaj and K. C. Sahu, “Coalescence dynamics of a droplet on a sessile droplet”, Physics of Fluids, 2020. DOI: https://doi.org/10.1063/1.5129901

5. M. Kumar, R. Bhardwaj and K. C. Sahu, “Motion of a Droplet on an Anisotropic Microgrooved Surface”, Langmuir, 2019. DOI: https://doi.org/10.1021/acs.langmuir.8b03604

6. M. Kumar and R. Bhardwaj, “A combined computational and experimental investigation on evaporation of a sessile water droplet on a heated hydrophilic substrate”, International Journal of Heat and Mass Transfer, 2018. DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2018.02.065

International Conferences:

1. M. Kumar, R. Bhardwaj and K. C. Sahu, ''Coalescence dynamics of a droplet on a sessile droplet'', 72nd Annual Meeting of the APS Division of Fluid Dynamics, Seattle, USA, November 2019.

2. R. Bhardwaj, M. Kumar and K. C. Sahu, ''Wetting dynamics of a droplet on micro-pillar surfaces with radially varying pitch'', 72nd Annual Meeting of the APS Division of Fluid Dynamics, Seattle, USA, November 2019.

3. M. Kumar, R. Bhardwaj and K. C. Sahu, ''Sliding Behavior of a Droplet on Surfaces Having Micro-grooves '', Droplets 2019, Durham, UK, September 2019.

4. M. Kumar, K. C. Sahu and R. Bhardwaj, “Sliding of a Droplet on a Micro-grooved Surface”, 71st Annual Meeting of the APS Division of Fluid Dynamics, Atlanta, USA, November 2018.

5. R. Bhardwaj and M. Kumar, “Designing a Bioinspired Hydrophobic Surface with honeycomb-like microtextures” 71st Annual Meeting of the APS Division of Fluid Dynamics, Atlanta, USA, November 2018.

6. M. Kumar, and R. Bhardwaj, “Numerical Modeling of Evaporating Sessile Droplet on a Substrate”, 24th National and 2^nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017), BITS Hyderabad, India, 2017.

7. M. Kumar, and R. Bhardwaj, “Evaporation of a Sessile Water Droplet on a Heated Hydrophilic Substrate”, 6th International and 43rd National Conference on Fluid Mechanics and Fluid Power, MNIT Allahabad, India, 2016.

8. V. Goel, and M. Kumar, “A Computational Fluid Dynamics Investigation of Solar Air Heater Duct Provided with Inclined Circular Ribs as Artificial Roughness”, STME-2013 International Conference on Smart Technologies for Mechanical Engineering, DTU Delhi, India, 2013.

Skill Set:

Numerical:

1. Finite Element Modelling

I have developed the following 2-dimensional solvers

• Laplace equation solver

• Poission equation solver

• Parabolic equation solver

• Steady-state and transient Navier-Stokes Solver in Cartesian coordinates- Lid-driven cavity problem was solved and validated.

• Steady-state Navier-Stokes Solver in Cylindrical coordinates- Flow inside an evaporating droplet was solved and validated.

2. Finite difference Modelling

During the academic course CMTFE (computational methods for thermal and fluids engineering) in IIT Bombay, numerous codes were developed as an assignment.

3. Finite Volume Modelling

Studied finite volume method during CFD course in IIT Bombay. Heat conduction and Navier-Stokes solver were made as part of the course.

4. Numerical Software

• ANSYS Fluent

• MATLAB

5. Programming Language

• Fortran 77 and 90

• MATLAB programming

• C++ (beginner level)

• Python (beginner level)

Experimental:

Trained user of following instruments

• High-Speed camera

• Thermal (Infrared) Camera

• Optical Microscope

• Optical Profilometer

Instrument used in Photo-lithography

• Laser Writer

• Spin coater

• RCA cleaning workbench (RCA cleaning process and Piranha cleaning)

• Mask aligner cum UV exposing instrument

Experience:

Postdoctoral Research Scholar, (Presently working)

Transfers, Interfaces and Processes (TIPs) Laboratory, Université libre de Bruxelles, Brussels 1050, Belgium.

Teaching Assistant, Jan. 2016 to Nov 2020

Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai.

Subjects:

1. Interfacial Transport Phenomenon (ME747)

2. Computational Methods for Thermal and Fluids Engineering (CMTFE) (ME704)

3. Fluid Mechanics (ME 219)

4. Thermal and Fluids Engineering Lab (ME657)

5. Fluid Structure Interaction (ME776)

Assistant Professor, Aug. 2013 to Dec. 2014

Department of Mechanical Engineering, J.S.S. Academy of Technical Education, Noida.

Grants Award:

• CSIR travel grant for attending DFD 2019 meeting at Seattle, USA.

• DST-SERB travel grant for attending Droplets 2019 meeting in Durham, UK.

• APS-DFD travel grant for attending DFD 2019 meeting at Seattle, USA.

• IITB travel grant for attending DFD 2018 meeting at Altanta, USA.