About
8
Publications
98,322
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
13
Citations
Introduction
Skills and Expertise
Publications
Publications (8)
A 42GHz-500kW ECRH system [1-6] is used to carry out various experiments related to plasma breakdown and ECR heating on tokamaks SST-1 and Aditya-U. The system has been upgraded with new anode modulator power supply to launch two ECRH pulses to carry out breakdown and heating simultaneously. In SST-1, ECRH system is used routinely for plasma breakd...
Electron cyclotron resonance heating (ECRH) launcher is an electro-mechanical system mainly consisting of mirrors (flat and profiled), a steering mechanism, a vacuum barrier window and a UHV (Ultra High Vacuum) compatible gate valve which focuses and steers the ECRH beam into plasma. Presently, Steady-state Superconducting Tokamak (SST)-1 ECRH syst...
Thermal Plasma processing has many applications in medical and environmental fields like melting, smelting and waste disposal. Here, the primary vessel known as plasma chamber is preheated to a high temperature of around ∼1000◦C using plasma arcs. In this design process, CFD (Computational Fluid Dynamics) analysis has played a major role in definin...
The Aditya tokamak has been upgraded to Aditya-U by changing it's vacuum vessel from rectangular to circular to accommodate the diverter coil for shaped plasma. The 42 GHz ECRH (Electron Cyclotron Resonance Heating) system has been integrated with the tokamak. The system is capable to deliver 500 kW power for 500 ms duration. The ECRH system with m...
Electron Cyclotron Resonance Heating (ECRH) system is successfully used at various tokamaks for heating, current drive and Neo-classical Tearing Mode (NTM) suppression [1,2]. The ECRH launcher consists of a microwave source known as Gyrotron which produces electromagnetic waves (high power Microwaves). These waves propagate through corrugated waveg...
The Electron Cyclotron Resonance Heating (ECRH) system is an important heating system for the reliable start-up of tokamak. The 42GHz and 82.6GHz Gyrotron based ECRH systems are used in tokomaks SST-1 and Aditya to carry out ECRH related experiments. The Gyrotrons are high power microwave tubes used as a source for ECRH systems. The Gyrotrons need...
In the tokamaks ECRH system is used for pre-ionization, start up, heating, current drive and suppression of NTMs (Neo Classical Tearing Modes). A Standard ECRH system consists of high power microwave source Gyrotron, circular corrugated waveguide based transmission line and launcher. The Focused ECH power is launched into plasma through launcher. T...
Questions
Questions (21)
I am trying to design a heat removal system for a specific application. As the heat flux is very high, the only way to reduce the temperature is by increasing fluid(water) velocity. I am worried about the erosion of the channels. The material is copper and SS304. The fluid is DM water. Is there a model or empirical relation by which I can predict the erosion of the channels over time? Is there any hard limit for water velocity in cooling channels?
In non-premixed combustion, Mixture fraction and Mixture fraction variance conservation is used. what is the physical interpretation of mixture fraction variance? Why do the values of the scalers depend on it?
How does it conserve?
Any simple explanation of this term is requested.
Shell conduction can be used to simulate the effect of solid layers in heat conduction.
- But, how are the equations solved for this additional layer?
- Is this additional layer spatially discretized?
- Does it consider lateral heat transfer in this layer?
I referred to Fluent theory guide. It does not explain the mathematical treatment of shell layers.
Fluent offers different temporal discretization schemes. There are two implicit schemes: Second order and bounded second order. I am wondering what are the advantages and disadvantages of these two schemes. I am working on multiphase problem having Eulerian Multiphase model. Which one should I prefer?
I am solving a multi-phase problem in Fluent. I want to define my secondary phase as the granular solid phase. I can see that in the dropdown menu of the secondary phase, only fluid materials are listed which I have already defined. Can someone help me with how to make the secondary phase solid?
Is it possible to interrupt the solution in the middle of the run and then resume it later? I know this is possible in CFD solvers but I am searching is such facility is available in Ansys mechanical.
I want to model a chemical reaction in Fluent. However, reaction being too complicated, there is no single activation energy model available. The DAEM approach is used to estimate the products from reactants. DAEM assumes that the evolution of a given product involves an infinite number of independent chemical reactions and their activation energies has generally Gaussian Distribution.
I want to use this model with Fluent.
I am currently simulating a system involving various chemical reactions. My primary phase is gaseous and secondary phase is solid. There are reactions involving solid to solid and gas to gas transformations. However, one reaction has gaseous reactants and forms a solid and a gaseous product. The solid will be definitely in powder form. I am currently using Eulerian model for Multi phase modeling. Can it model this reaction properly?
I have a geometry where the flow is transitional. i.e. a part of it has laminar flow and rest part has turbulent flow.
Can I use k-epsilon model for this problem? Does it resolve the laminar region well?
