Hari MAHALINGAM

Email: onlyhari [at] gmail [dot] com

mhari[ at] nitk [dot] edu [dot] in

Professional Experience           

Education

Research Interests

·         Process modeling, simulation and optimization

·         Polymer-supported Photocatalysis

Publications

1.       R. Kumar, H. Mahalingam and K.K. Tiwari, Theoretical analysis of mass transfer in a droplet moving down in supercritical carbon dioxide environment, Int. J. Chem. Eng. Applications, 6(3), 190-194, 2015

2.      S. Singh, P.K. Singh and H. Mahalingam, A novel and effective strewn polymer-supported titanium dioxide photocatalyst for environmental remediation, J. Mat. Env. Sci., 6(2), 349-358, 2015

3.      S. Singh, P.K. Singh and H. Mahalingam, An Effective and Low-Cost TiO₂/Polystyrene Floating Photocatalyst for Environmental Remediation, Int. J. Env. Res., 9(2), 535-544, 2015

4.      S. Singh, P.K. Singh and H. Mahalingam, Novel floating Ag⁺-doped TiO₂/PS photocatalysts for treatment of dye wastewater, Ind. Eng. Chem. Res., 53(42), 16332-16340, 2014

5.      S. Ramesh, H. Mahalingam and N.J. Rao, MathematicalModeling of Drying of Black Liquor Droplets in Recovery Boilers, Int. J. Chem. Eng. Applications, 5(1), 1-5, 2014

6.      S. Singh. D.P. Chand, A. Chaki, A. Raghuvanshi, P.K. Singh and H. Mahalingam, A novel polystyrene-supported Titanium Dioxide photocatalyst for degradation of Methyl Orange and Methylene Blue dyes under UV Irradiation, J. Chem. Eng. (IEB), 28 (1), 9 – 13, 2013

7.      S. Singh, H. Mahalingam and P.K. Singh, Polymer-supported titanium dioxide photocatalysts for environmental remediation: A review, Applied Catalysis A: General, 462-463, 178-195, 2013

8.      S. Ramesh, A.S. Chaurasia, H. Mahalingam & N.J. Rao, Kinetics of devolatilization of black liquor droplets in chemical recover boilers: Pyrolysis of dry black liquor solids, Int. J. Chem. Eng. Applications, 4(1), 1-5, 2013

9.      R. Kumar, H. Mahalingam and K.K. Tiwari, Modeling of droplet composition in supercritical antisolvent process: Part A,  Int. J. Chem. Eng. Applications, 3(6), 456-460 , 2012

10.   I.A. Karimi, M. Sharafali and H. Mahalingam, Scheduling tank container movements for chemical logistics, AIChE J, 51(1), 178-197, 2005

11.    M. Hari and R.B.H. Tan, A dynamic systems approach to mixing in circulating flows, Chem. Eng. Tech., 25(8), 811-818, 2002

12.   M. Hari and R.B.H. Tan, Mixing in circulating flows, Chem. Eng. J, 73(1), 29-35, 1999

13.   R. Senthil Kumar, M. Hari, L.R. Miranda and M. Velan, Hydrodynamic characteristics of a tapered fluidized bed reactor, Hungarian J. Ind. Chem., 25(4), 281-286, 1997

Presentations in conferences

1. S. Singh, H. Mahalingam and P.K. Singh, An effective strewn silver ion-doped polystyrene-supported floating titania photocatalyst for treatment of dye wastewaters under UV and natural sunlight, 3^rd Water Research Conference, Shenzhen, China, January, 2015

2. S. Singh, H. Mahalingam and P.K. Singh, Effective and robust impregnated and strewn polystyrene-supported floating titanium dioxide photocatalysts: Preparation, characterization and comparison, International conference on Energy, Environment, Materials and Safety (ICEEMS’14), Cochin, India, December 10-12, 2014

3. R. Kumar, H. Mahalingam and K.K. Tiwari, Effect of solvent on droplet size in supercritical antisolvent process, 5^th International conference Chemical, Biological and Environmental Engineering (ICBEE 2013), New Delhi, India, September 2013

4. R. Kumar, H. Mahalingam and K.K. Tiwari, Effect of process parameters on droplet size in supercritical antisolvent process, International conference on Advances in Chemical Engineering, NIT Raipur, April 2013

5. R. Kumar, H. Mahalingam and K.K. Tiwari, Droplet dynamics in Supercritical Antisolvent Processes, 5^th International conference Chemical, Biological and Environmental Engineering (ICBEE 2012), Phuket, Thailand, September 2012. Published in APCBEE Procedia (Elsevier), 9, 181-186, 2014

6. I.A. Karimi, M. Sharafali and H. Mahalingam, An Event-Based Approach to the Management of Empty Tank Containers, INFORMS 2003, Atlanta, USA, October 2003

7. M. Hari and R.B.H. Tan, A dynamical systems approach to mixing in stirred tanks, Mixing XVIII, Poconos, USA, June 2001

8. M. Hari and R.B.H. Tan, Mixing in circulating flows, Mixing XVII, Banff, Canada, August 1999

Achievements and Honors

·         Scholarships from CSIR (Government of India) for 1 year at Anna University (1996 - 1997) and National University of Singapore (1997 – 2001)

·         Ranked 1^st in M.Tech program

·         Best Paper award at the 5^th International conference Chemical, Biological and Environmental Engineering (ICBEE 2013), New Delhi, India, September 2013.

Teaching Experience

·         Question paper setter, Samrat Ashok Technological Institute, Vidisha, M.P., October 2013

·         Reviewer - Chemical Engineering Communications journal, Journal of Environmental Chemical Engineering etc.

·         Graduate teaching assistant for two courses at the National University of Singapore (1997 – 2001)

·         Graduate teaching assistant for two courses at Anna University (1996)

Research skills

·         Computational softwares: GAMS, Mixsim & Fluent, Fortran, MATLAB, CHEMCAD

·         Experimental techniques: Particle imaging velocimetry & two dimensional trajectography

Workshops/Training Programs Organized

Current Research Activities

• Modeling of black liquor droplet phenomena in black liquor recovery boilers: The focus is on developing mathematical models to predict the complex phenomena happening in the black liquor droplet as it falls through the hot atmosphere of a black liquor recovery boiler. The droplet will experience drying, shrinking, devolatilization and swelling as it falls. It is hoped that the model can be used to predict safe operating regimes for large scale recovery boilers. Studies have been done using black liquor obtained from Indian pulp and paper mills.
• Modeling of particulate processes in supercritical antisolvent micronization processes: This study focuses on the two-way mass transfer of a droplet in the precipitator of a typical supercritical antisolvent process. Due to the supercritical fluid diffusing into the droplet of solute and solvent, the solvent gets replaced and supersaturation occurs causing the solute to precipitate out.
• Extraction-based studies: Some research projects given to M.Tech. and B.Tech. students deal with designing a separation process for separation of acetic acid from a pharmaceutical waste stream using amine-based solvents. Another area is extraction of active ingredients from agricultural resources (e.g. vitamin E from soyabean seeds.)
• Polymer-supported photocatalysts for wastewater treatment: Here attention is focused on simple and low-cost preparation of polymer-supported titanium dioxide photocatalysts for use in wastewater treatment. Floating polystyrene based photocatalysts have been prepared and tested in the degradation of methylene blue and methyl orange dyes under UV and solar irradiation.