An Analytical Investigation Of The Transient Ablation Of Teflon In Convective And Radiative Environments
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Total Pages | : 20 |
Release | : 1979 |
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Download An Analytical Investigation of the Transient Ablation of Teflon in Convective and Radiative Environments Book in PDF, Epub and Kindle
Author | : Norio Arai |
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Total Pages | : |
Release | : 1979 |
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Download An Analytical Investigation of the Transient Ablation of Teflon in Convectiveand Radiative Environments Book in PDF, Epub and Kindle
Author | : Barry Lee Clark |
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Total Pages | : 492 |
Release | : 1971 |
Genre | : Ablation (Aerothermodynamics) |
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Download An Experimental and Analytical Investigation of Teflon Ablation Heat Transfer Parameters by the Method of Nonlinear Estimation Book in PDF, Epub and Kindle
Author | : Tōkyō Daigaku Uchu Kagaku Kōkugaku Kenkyujo |
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Total Pages | : 540 |
Release | : 1980 |
Genre | : Aeronautics |
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Download Reports Book in PDF, Epub and Kindle
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Total Pages | : 1128 |
Release | : 1979 |
Genre | : Aeronautics |
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Download International Aerospace Abstracts Book in PDF, Epub and Kindle
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Total Pages | : 252 |
Release | : 1973 |
Genre | : Mechanics, Applied |
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Download Applied Mechanics Reviews Book in PDF, Epub and Kindle
Author | : Mianzhi Wang |
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Total Pages | : 232 |
Release | : 2012 |
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Download Numerical Analysis of Transient Teflon Ablation with a Domain Decomposition Finite Volume Implicit Method on Unstructured Grids Book in PDF, Epub and Kindle
Abstract: This work investigates numerically the process of Teflon ablation using a finite-volume discretization, implicit time integration and a domain decomposition method in three-dimensions. The interest in Teflon stems from its use in Pulsed Plasma Thrusters and in thermal protection systems for reentry vehicles. The ablation of Teflon is a complex process that involves phase transition, a receding external boundary where the heat flux is applied, an interface between a crystalline and amorphous (gel) phase and a depolymerization reaction which happens on and beneath the ablating surface. The mathematical model used in this work is based on a two-phase model that accounts for the amorphous and crystalline phases as well as the depolymerization of Teflon in the form of an Arrhenius reaction equation. The model accounts also for temperature-dependent material properties, for unsteady heat inputs and boundary conditions in 3D. The model is implemented in 3D domains of arbitrary geometry with a finite volume discretization on unstructured grids. The numerical solution of the transient reaction-diffusion equation coupled with the Arrhenius-based ablation model advances in time using implicit Crank-Nicolson scheme. For each time step the implicit time advancing is decomposed into multiple sub-problems by a domain decomposition method. Each of the sub-problems is solved in parallel by Newton-Krylov non-linear solver. After each implicit time-advancing step, the rate of ablation and the fraction of depolymerized material are updated explicitly with the Arrhenius-based ablation model. After the computation, the surface of ablation front and the melting surface are recovered from the scalar field of fraction of depolymerized material and the fraction of melted material by post-processing. The code is verified against analytical solutions for the heat diffusion problem and the Stefan problem. The code is validated against experimental data of Teflon ablation. The verification and validation demonstrates the ability of the numerical method in simulating three dimensional ablation of Teflon.
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Total Pages | : 1234 |
Release | : 1990 |
Genre | : Heat |
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Download Journal of Thermophysics and Heat Transfer Book in PDF, Epub and Kindle
This journal is devoted to the advancement of the science and technology of thermophysics and heat transfer through the dissemination of original research papers disclosing new technical knowledge and exploratory developments and applications based on new knowledge. It publishes papers that deal with the properties and mechanisms involved in thermal energy transfer and storage in gases, liquids, and solids or combinations thereof. These studies include conductive, convective, and radiative modes alone or in combination and the effects of the environment.
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Total Pages | : 836 |
Release | : 1987 |
Genre | : Heat |
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Download AIAA 87-1466 - AIAA 87-1538 Book in PDF, Epub and Kindle
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Total Pages | : 430 |
Release | : 1979 |
Genre | : Aeronautics |
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