BITS Faculty Publications

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    Influence of electric potential boundary condition on the electrospraying process
    (Elsevier, 2025-08) Rao, Venkatesh K.P.; Yadav, Shyam Sunder
    In the current work, we perform three dimensional numerical simulations of the electrospraying process. Our aim is to investigate the effect of electric potential boundary condition on the electrospraying process of a liquid. We observe a steady electrospraying process in the cone jet mode for the case of uniform electric potential boundary condition. On the other hand, we observe a highly unsteady, violent electrospraying process for the case of non-uniform boundary condition. We provide explanation of this widely different behavior of the electrospraying process.
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    A three-dimensional open-source solver for incompressible viscoelastic two-component flows
    (ASME, 2025-10) Rao, Venkatesh K.P.; Yadav, Shyam Sunder
    In this study, we unveil a three-dimensional flow solver designed to simulate viscoelastic two-phase flows using the Oldroyd-B formulation. Acknowledging the challenges that researchers encounter in this dynamic field, we have integrated the three-dimensional Log conformation approach into the open-source flow solver basilisk, significantly enhancing its capabilities beyond its two-dimensional predecessors. Our solver stands as a testament to rigorous testing against a wide range of three-dimensional viscoelastic flow challenges, encompassing both single and two-phase scenarios drawn from established literature. True to its two-dimensional roots, it exhibits extraordinary robustness, adeptly managing viscoelastic flows, even at high Weissenberg numbers. By offering this powerful solver as an open-source resource, we aspire to empower the computational fluid dynamics community. We believe it will become an invaluable tool for researchers delving into the complexities of viscoelastic flows, fostering innovation and inspiring new progress in the field.
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    Boiling of R134a in a Plate-Fin Heat Exchanger Having Offset Fins
    (ASME, 2015-12) Ranganayakulu, Chennu
    This paper presents experimental results on boiling heat transfer of R134a in a compact plate fin heat exchanger. The exchanger is made of aluminum and has high density offset fins (30 fins/in.). Such heat exchangers are widely used in air separation industry and aerospace applications because of their high compactness and low weight. The test heat exchanger is attached to a vapor cycle refrigeration basic module to study the effects of boiling phenomena and its influence on performance as there is limited information available for this type of fins. This in turn allows for discussion on boiling mechanism of R134a inside the fins using the water circuit on the other side of the test heat exchanger. The water side single phase heat transfer coefficient (Colburn j factor) is calculated using the cfd tool fluent and validated with available open literature. The results are presented for heat fluxes up to 5500 W/m2 and mass fluxes up to 20 kg/(m2s) with water side flow rate varying from 0.033 to 0.17 kg/s for water temperatures of 10, 15, 20, 25, and 30 °C.
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    Two-phase analysis of blood flow through a stenosed artery with the effects of chemical reaction and radiation
    (Springer, 2021-03) Sharma, Bhupendra Kumar
    The paper presents a study related to the two-phase analysis of pulsatile blood flow through a narrowed stenosed artery with radiation and the chemical effects. In the model, a vertical artery is considered in which the flow of blood is assumed vertical upward and the direction of an external applied magnetic is in the radial direction of the flow. To understand the behavior of blood flow, graphs of the velocity profile, wall shear stress, flow rate, flow impedance and concentration profile are portrayed with different values of the magnetic and radiation parameters. In order to validate the results, a comparative study is presented between the single-phase and two-phase model of the blood flow, which shows that the two-phase model fits more accurately with the experimental data than the single-phase model, as mean errors are 0.3% for the two-phase model while it is 1% for single-phase model. For pulsatile flow, the phase difference between the pressure gradient and the flow rate is displayed with the effects of the magnetic field and different heights of the stenosis.
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    Influence of Heat and Mass Transfer on Two-Phase Blood Flow with Joule Heating and Variable Viscosity in the Presence of Variable Magnetic Field
    (World Scientific, 2020) Sharma, Bhupendra Kumar
    In this paper, simultaneous effects of viscous dissipation and Joule heating on unsteady two-phase blood flow through a stenosed artery in the presence of variable applied magnetic field have been investigated. The present two-layered model of blood flow consists of a central core of suspended erythrocytes and a cell-depleted plasma layer surrounding the core. It is assumed that the viscosity of the cell-free plasma layer is constant while the viscosity of the core is a function of the hematocrit level. A consistent system of nonlinear partial differential equations is solved numerically using shooting methods to estimate the flow rate, flow resistance and wall shear stress. The quantitative profile analysis of velocity, temperature and concentration as well as the Nusselt number and Sherwood number is carried out over the entire arterial segment. To validate the model, a comparative study has been done between the present results and the experimental results for the cell velocity distribution of 40% RBC containing blood which exhibits that the present results are in fairly good agreement with the experimental results. The velocity contours have been plotted to understand the flow pattern in the diseased narrowed artery, which alters significantly in the downstream of the stenosis under the influence of magnetic field.