
Nirmala P. Ratchagar and R.Vijayakumar, "Effect of couple stress and magnetic field on the unsteady convective diffusion in blood flow.", World Journal of Engineering, Volume 11, Number 4, 2014, pp. 403412. 2014.  

Nirmala P. Ratchagar and R.Vijayakumar, "Effect of magnetic field on the red cell on nutritional transport in capillarytissue exchange system.", International Journal of Mathematical Modeling & Computations, Volume 4, Number 1, Jan 2014, pp. 115. 2014.  

Nirmala P. Ratchagar and S.P. Subramanian, "Solutions of the SEIR model of epidemics using HAM.", World Journal of Engineering, Volume 11, Number 3, Jul 2014, pp. 297310. 2014.  

MeenaPriya, P. and Nirmala P. Ratchagar, "Coagulation and condensation of aerosols in atmospheric dispersion model.", The Journal of Computational Multiphase Flows, Volume 5, Number 2, 2013, pp. 115138. 2013.  

Nirmala P. Ratchagar and S.V. Hemalatha, "Study of oil spill on the sea surface in the presence of thermal and concentration buoyancy effects.", International Journal of Mathematical Modeling & Computations, Volume 3, Number 3, Sep 2013, pp. 157168. 2013.  

S. Kavitha and Nirmala P. Ratchagar, "A deterministic dynamic programming approach for optimization problem with quadratic objective function and linear constraints.", World Academy of Science, Engineering and Technology, Volume 75, Number , Jun 2013, pp. 780784. 2013.  

S. Kavitha and Nirmala P. Ratchagar, "A hybrid differential evolution – iterative greedy search algorithm for capacitated vehicle routing problem.", International Journal of Computing and Mathematical Applications, Volume 6, Number , Jan 2013, pp. 19. 2013.  

Kavitha, S. and Nirmala P. Ratchagar, "A new analytical approach for the solution of optimization problem with cubic objective function.", World Journal of Engineering, Volume 10, Number 5, 2013, pp. 471484. 2013.  

S. Kavitha and Nirmala P. Ratchagar, "Discrete and continuous state dynamic programming approach for piecewise quadratic optimization problem.", International Review on Modelling and Simulations, Volume 5, Number 6, Dec 2012, pp. 26362646. 2012.  

MeenaPriya, P. and Nirmala P. Ratchagar, "EHD dispersion of atmospheric aerosols through a vertical channel with temperature distributions.", World Journal of Engineering, Volume 9, Number 4, 2012, pp. 293306. 2012.  

Nirmala P. Ratchagar and Valsamy.P , "Unsteady transport of bacteria and virus in groundwater.", International Journal of Mathematical Sciences and Engineering Applications, Volume 6 , Number 1, 2012, pp. 197205. 2012.  

MeenaPriya, P. and Nirmala P. Ratchagar, "Transport of Aerosols in the Presence of Electric Field with Interphase Mass Transfer.", International Journal of Engineering Research & Technology , Volume 1, Number 4, 2012, pp. 111. 2012.  

MeenaPriya, P. and Nirmala P. Ratchagar, "Effect of Reaction Rate on Dispersion of Atmospheric Aerosols in the Presence of Electric Field.", ”, International Journal of Computer Applications, Volume 4, Number 5, 2012, pp. 4753. 2012.  

Nirmala P. Ratchagar and P. Valsamy, "Temperature distribution of groundwater flow through an open inclined channel.", Journal of Ultra Scientist of Physical Sciences, Volume 23, Number 2, Jun 2011, pp. 589600. 2011.  

Nirmala P. Ratchagar and K. Elangovan, "Analytical solution to the problem of MHD flow between inclined porous plates.", International J. of Math. Sci. Engg. Appls. , Volume 5, Number 5, Nov 2011, pp. 105122. 2011.  

Nirmala P. Ratchagar and P. Meenapriya, "Effect of couple stress on the unsteady convective diffusion of atmospheric aerosols in the presence of electric field.", International Journal of Mathematical Science and Engineering Applications, Volume 5, Number 4, Jul 2011, pp. 293310. 2011.  

Nirmala P. Ratchagar and P. Meenapriya, "Generalized dispersion of atmospheric aerosols on unsteady convective diffusion in couple stress fluid bounded by electrodes.", International Journal of Applied Mathematics and Engineering Science, Volume 5, Number 1, Jan 2011, pp. 5972. 2011.  

Nirmala P. Ratchagar and Elangovan,K, "MHD Steady flow through porous medium.", Journal of Indian Academy of Mathematics , Volume 32, Number 1, 2010, pp. 131138. 2010.  

Nirmala P. Ratchagar and Elangovan,K., "Steady flow through a circular vertical pipe with slipe at the permeable boundaries with an applied magnetic field.", Applied Mathematical sciences, Volume 4, Number 50, 2010, pp. 24452452. 2010.  

Nirmala P Ratchagar, Vijaya S, Saithyamoorthi R. , "A Stochastic model for expected time to seroconversion using order statistics and correlation antigenic diversity in HIV infection.", International Journal of Physical Science, Ultra Scientist , Volume 21, Number 1, 2009, pp. 191198. 2009.  

Nirmala P. Ratchagar and Elangovan,K., "Unsteady MHD flow of a dusty fluid through a circular pipe.", Journal of Ultra Scientist of Physical Science, Volume 21, Number 3, 2009, pp. 739748. 2009.  

Nirmala P. Ratchagar and Valsamy.P , "Chemical behaviour of contaminants in porous media.", Indian Journal of Mathematics and Mathematical Sciences, Volume 5, Number 2, 2009, pp. 4955. 2009.  

Nirmala P. Ratchagar and Chitra M , "Effects of Fine and Coarse Dust Particles on Transport of Air in Trachea.", Journal of Indian Academy of Mathematics , Volume 29, Number 2, 2007, pp. 551570. 2007.  

Nirmala P. Ratchagar, Chitra M. , "Aspects of air flow through a trachea with mild constriction.", BioScience Research Bulletin, Volume 22, Number 1, 2006, pp. 1729. 2006.  

P.N. Tandon, P. Nirmala, and Mamta Tewai, "Analysis of Nutritional transport through Capillary: Normal and stenosed.", Computer Math application, Volume 22, Number 12, 1991, pp. 331. 1991.  

P.N. Tandon, P. Nirmala, and T.S.Pal, "Rheological study of lubricant gelling in synovial joints during articulation.", J.applied Mathematics modeling, Volume 12, Number 1, 1988, pp. 7277. 1988.  