Department of Mechanical engineering

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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.