Journal for Foundations and Applications of Physics
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Modeling the dark universes
Get PDFThe search for dark matter has lately been extended to assume a dark segment of the universe that contains mutually interacting particles, supposed to interact with white matter only through the gravity force. This article presents a concept analysis that shows how string theory can model different segments of the cosmos in order to match measurements of dark matter and dark energy
Effect of streaming and temperature anisotropy in Wiedemann-Franz law for collisional magnetoplasma
Get PDFThe presence of beam in a two component fully ionized electron-ion magneto plasma entails streaming or mass motion of plasma species causing energy dissipation. The collisional diffusion transport coefficients are significantly modified in presence of the streaming velocity. Further these coefficients are also found to be modified owing to anisotropy in plasma species temperature. The modified transport coefficients result in significant modifications of Wiedemann-Franz ratio in terms of streaming velocity and temperatures along and perpendicular to the direction of field
Derivation of generalized Young’s Equation for the Wetting Phenomena of Cylindrical Droplets
Get PDFThe contact angles of cylindrical droplets on smooth and chemically homogeneous nondeformable substrates were studied by methods of thermodynamics. The total grand potential of the system was calculated. Then, a generalized Young\u27s equation for wetting of cylindrical droplets on chemically homogeneous and smooth substrates was derived based on the thermodynamicequilibrium condition. The theoretical derivation of the generalized Young\u27s equation is a typical application of Gibbs\u27 theory of capillary phenomena
Improvement of power factor of a grid connected load system using a static compensator
Get PDFThe power factor deteriorates due to non-linear loads, interconnected grid system, amplitude disturbances and wave shape disturbances. A low power factor system draws high internal current causing excessive heat. It requires heavier equipments to absorb internal energy requirements. Also large penalty is imposed on low power factor consumers. So, power factor should be improved in order to get rid of the above problems. In this paper, a shunt connected Flexible AC Transmission Systems (FACTS) device such as Static Compensator (STATCOM) is used to improve the power factor by compensating the reactive power required by the load
Study of 3MeV DC Electron Beam Accelerator to implement Distributed Control System
Get PDFElectron beams with beam energy in the range of 0.2 to 10 MeV have found a large number of industrial applications such as cross linking of plastic film, foam and cables, degradation of scrap Teflon, sterilization of medical products and food irradiation. Keeping these industrial applications in mind, the development and commissioning of a 3 MeV accelerator is being done at Electron Beam Center at Kharghar, Navi Mumbai. The accelerator comprises of several sub systems such as Scan magnet supply, Chiller unit, Vacuum unit, High voltage unit and other support sub-systems. All the above subsystems have to be controlled from central location in order to operate and monitor the accelerator safely.Each of the sub-system is controlled by a Programmable Logic Controller (PLC) independently and their control and safety is ensured by the program logic. After each subsystem is tested separately all the PLCs are connected to the central PLC via Modbus RS232 and Modbus TCP-IP to implement the technology of Distributed Control System (DCS). A DCS refers to a process in which elements from different locations can be controlled by inputs from a remote place by different modes of control implementation
Simulation studies on vapor phase condensation of magnesium and computations of nucleation rates using Discrete-Section model
Get PDFCapacity of discrete section models as a reliable tool to analyze and predict the data in particle nucleation and growth experiments has been demonstrated through comparisons of simulated and experimental data. A computer code based on this model is developed and homogenous nucleation of particles and growth is simulated. The results have been benchmarked against the published data on nucleation and growth in iron vapors. The published experimental results of condensation of magnesium vapors through homogenous nucleation are then analyzed using the results of simulations. The predicted values of magnesium vapors super saturation ratio and temperature at the point ofnucleation are in excellent agreement with the experimental data. The code is used to compute the particle nucleation rate and computed values are compared with the values predicted by analytical expressions based on different theories. It is demonstrated that the model is able to predict values which are close to experimental values and thus can be used to predict nucleation rate
Three dimensional computational fluid dynamic simulation of a segmented Non-transferred Arc Plasma Torch
Get PDFThree dimensional computational fluid dynamic (CFD) simulation of a segmented non transferred arc plasma torch is done for the purpose of computing heat load to various torch components and obtaining the temperature and velocity profile at the exit of the torch. The region inside the torch was simulated along with simulation of water flow channels. To obtain the current flow and resulting joule heating, electric potential equation is solved inside the torch region. Simulation runs for several values of arc current and plasma gas flow rate are done and results are compared