B. P. Puranik

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An experimental investigation of the shock-induced interfacial instability (RichtmyerMeshkov instability) is undertaken in an effort to study temporal evolution of interfacial perturbations in the nonlinear regime. The experiments are performed in a vertical shock tube with a square cross-section. A membraneless interface is prepared by retracting a(More)
A large number of experimental investigations of the Richtmyer-Meshkov instability (a shock-induced interfacial instability) in the past have been carried out in shock tubes. In order to separate the two gases prior to the shock arrival, a plastic membrane, on the order of one micron thick, was often used. There is considerable uncertainty regarding the(More)
A new ab initio based chemical model for a Direct Simulation Monte Carlo (DSMC) study suitable for simulating rarefied flows with a high degree of non-equilibrium is presented. To this end, Collision Induced Dissociation (CID) cross sections for N2+N2→N2+2N are calculated and published using a global complete active space self-consistent field-complete(More)
DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government, nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information,(More)
The effect of Alumina nanoparticle size on thermophysical properties, heat transfer performance and pressure loss characteristics of Aviation Turbine Fuel (ATF)-Al2O3 nanofluids is studied experimentally for the proposed application of regenerative cooling of semi-cryogenic rocket engine thrust chambers. Al2O3 particles with mean diameters of 50 nm or 150(More)
Cross sections for the homo-nuclear atom-diatom collision induced dissociations (CIDs): N2 + N and O2 + O are calculated using Quasi-Classical Trajectory (QCT) method on ab initio Potential Energy Surfaces (PESs). A number of studies for these reactions carried out in the past focused on the CID cross section values generated using(More)
Shock tube experiments for the study of the Richtmyer-Meshkov instability are presented. The shock tube is vertical with a square inner cross section. Two new techniques are used to prepare the interface and to determine its initial shape, prior to shock-acceleration. The interface is prepared by retracting a sinusoidally shaped plate initially separating(More)
Flow through micro and mini channels requires relatively high driving pressure due to the large fluid pressure drop through these channels. Consequently the forces acting on the walls of the channel due to the fluid pressure are also large. Due to these forces there are displacement fields set up in the solid substrate containing the channels. If the(More)
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