Sponsored Research Project
Topic |
Funding Agency |
Year |
Experimentation & CFD analysis of water behavior and removal technique for PEM fuel cell |
SERB |
2015 |
Development of numerical models for entrainment and deposition rates to predict dry out in AHWR fuel bundle |
BRNS |
2017 |
Study of biodiesel production in mini channel Reactor-Experimentation and Numerical Analysis |
CSIR |
2018 |
Understanding and prototype development of a point absorber wave energy converter phase IA |
ONGC Energy Centre |
2020 |
Research Work Highlights
Diabatic annular flow boiling:Numerical modeling of two-phase annular flow boiling has been carried out inside a tube using volume of fluid based computational multifluid dynamics. Entrainment from liquid-vapor interface and boiling from the solid-liquid interface are captured from basic hydrodynamics before predicting the route towards the dryout condition. The stages of bubble nucleation, growth, merging, bursting, droplet entrainment, film rewetting, and dryout has been clearly visualized for diabatic annular mist flow.
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Dryout in nuclear fuel rod bundle:For the modeling of the interfacial structure characteristics, numerical modelling of flow boiling around 7 pin nuclear fuel rod bundle assembly without spacer has been carried out. VOF based multiphase flow involving phase change solver has been used for the same purpose. Constant wall temperature for fuel rod and uniform velocity of liquid at inlet patch has been applied as boundary condition. The fluid properties of saturated water and vapor are taken at atmospheric pressure conditions. The comparison of liquid-vapor distribution for inside rod and outside rod has been shown with contour .
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Numerical simulation of annular flowNumerical simulation of annular flow under high gas-liquid velocity ratio has been performed. The generation of disturbance wave and process of pinch-off of droplets can be visualized in video. At the core air is flowing and at periphery water is flowing at atmospheric conditions.
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Experimental study on vortex breaking into droplet in overflow pipe:(Ranjana Rathaur)
Experimental study of liquid draining from rectangular tank with overflow pipe has been done which can be seen in applications like roof-rain leaders or tank drains and in large systems such as drop shaft spillways of large dams. Study of critical height of the air core vortex and transition of droplet-shaped air bubble to donut shaped air bubble has been going on. |
Numerical study of liquid draining(Ranjana Rathaur)
Numerical study of liquid draining from rectangular tank with symmetric and asymmetric discharge port has been done using OpenFOAM solver. In figure, pressure contour for asymmetric and symmetrical tank can be visualized to understand the pressure variation during the draining process. |
Air Water Flow in Serpentine Mini Channel(Sneha Malhotra)
The two phase flow dynamics in three serpentine channels with different hydraulic diameters (DH ) - varying from micro scale ( DH < 1mm) to mini scale (2mm > DH > 1mm). The novelty of this work is its gas flow channel design and comparison of hydrodynamics in mini and micro serpentine channels. The flow pattern observed in the photograph is Ring Flow, Slug Flow and Distorted Slug Flow. Based on these experimental observations, suitable transition criteria are proposed in terms of phase Weber numbers . |
Drop dynamics in serpentine microchannel
(Sneha malhotra)
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