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Ram Prakash Bharti
Assistant Professor (2009 - Present). IIT Roorkee, India

Post-Doctoral Fellow (2007-2009). University of Melbourne, Australia
Senior Project Associate (2007). IIT Kanpur, India

Ph.D. (2006). IIT Kanpur, India
M.Tech. (2002). IIT Bombay, India
B.Tech. (2000). SLIET Longowal, India


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Research Gate

Broad Research Interests
  • Computational Fluid Dynamics:
    Using Finite Difference Method (FDM), Finite Volume Method (FVM), FLUENT
  • Electrokinetics in Microfluidics, Biofluidics
  • Hydrodynamics and Heat Transfer:
    Non-Newtonian Fluids, Bluff Bodies, Microchannels

Research Overview
Over the recent years, our research has been focused on the investigation of role of non-Newtoian fluid rheology on the hydrodynamics and heat transfer in model flow configurations such as bluff bodies and microchannels using the computational fluid dynamics (CFD) tools. A brief overview of the research is as follow:
  • Convective Hydrodynamics of Non-Newtonian Fluid Flow Across Bluff Bodies:
    The influences of non-Newtonian fluid rheology on the hydrodynamics of convective flow across bluff bodies have been elucidated for various model flow configurations including the confined/unconfined cross-flow over a single cylinder of circular and elliptical cross-sections and for the two circular cylinders in a tandem arrangement, etc. The appropriate forms of the equations of continuity, momentum and thermal energy in conjunction with non-Newtonian fluid viscosity model are solved using an finite volume method (FVM) based in-house computational fluid dynamics (CFD) solver and using commerically CFD software (FLUENT). In particular, the influences of the non-Newtonian fluid rheology, flow governing parameters (Reynolds number, Prandtl number, buoynacy parameter) and geometrical flow configurations (confined/unconfined) on the detailed kinematics of flow (streamline, vorticity, pressure and isotherm contours; local pressure, local vorticity and local Nusselt number profiles) and global flow and heat transfer characteristics (individual and total drag coefficients and average Nusselt number) have been studied to gain physical insights into the nature of flow. The numerical results have been used to developed simple predictive closure relationship as a function of dimensionless parameters.
         This information is essential to delineate the dead zonez and local hot/cold regions which helps achieve uniform product quality especially during the thermal processing of temperature sensitive materials (such as polymers, food-products). Reliable values of the gross engineering parameters including drag coefficient and Nusselt number encompassing wide ranges of the flow governing parameters and non-Newtonian flow parameters are also needed in process design calculations.
  • Microfluidics:
    In the field of microfluidics, our research has been primarily focused on the investigation of the electrokinetic effects in the pressure-driven flow of Newtonian/non-Newtonian fluids through electrically charged microfluidic devices (uniform and non-uniform microchannels) of different cross-sections by using an in-house computational fluid dynamics (CFD) solver, which is a hybrid solver based on the finite-difference and finite-volume methods. Governing flow equations, namely, Navier-Stokes equations in conjunction with electrical body forces and non-Newtonian fluid viscosity, Nernst-Planck equation and Poisson-Boltzmann equation have been solved to investigate the electroviscous effects (i.e., influence of the uniformly charged microchannel wall and the Debye parameter) and role of non-Newtonian fluid rheology on the flow field (i.e., flow patterns, electrical potential field, ion concentrations field), pressure drop and apparent viscosity in the electrolyte liquid flow at low Reynolds numbers.
         It is important to know this information as the microchannel flow characteristics deviates from the macroscale flows due to the increasing importance of surface-based phenomena (capillary, wetting, surface tension, electrokinetic effects) and rarefaction effects (velocity slip and surface temperature jump) at micrometer scales, the relative importance of the forces that can influence fluid flow is different at the length scales of these devices (typical characteristic length ~ 10 to 200 µm). Therefore, an understanding of liquid flow characteristics is a pre-requisite for the successful optimal design and precise control of the microfluidic devices for their ability to transport, manipulate and process fluids (generally aqueous based solutions) at very small scales.
The outcomes of the research have been published in various refereed interenational journal papers and conference proceedings. For more details, see the complete list of publications.
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Recent Publications (Complete List of Publications)
  • F.-B. Tian, R.P. Bharti and Y.-Q. Xu. Deforming-Spatial-Domain/Stabilized Space-Time (DSD/SST) method in computation of non-Newtonian fluid flow and heat transfer with moving boundaries. Computational Mechanics, 53(2), 257-271 (2014). (Selected and highlighted as Featured Article in Advances in Engineering)
  • A. Kumar, A.K. Dhiman and R.P. Bharti. Power-law flow and heat transfer over an inclined square bluff body: effect of blockage ratio. Heat Transfer - Asian Research, 43(2), 167-196 (2014).
  • J.D. Berry, M.R. Davidson, R.P. Bharti and D.J.E. Harvie. Effect of wall permittivity on electroviscous flow through a contraction. Biomicrofluidics, 5(4), 044102 (17 pages) (2011).
  • M.R. Davidson, R.P. Bharti and D.J.E. Harvie. Electroviscous effects in a Carreau liquid flowing through a cylindrical microfluidic contraction. Chemical Engineering Science, 65(23), 6259-6269 (2010).
  • V.K. Patnana, R.P. Bharti and R.P. Chhabra. Two dimensional unsteady forced convection heat transfer in power-law fluids from a heated cylinder. International Journal of Heat and Mass Transfer 53(19-20), 4152-4167 (2010).
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Copyrights © 2010 by Dr. R.P. Bharti This page was updated on March 08, 2013