International Journal of Air-Conditioning and Refrigeration
- Volume 8 Issue 2
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- Pages.11-22
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- 2000
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- 2010-1325(pISSN)
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- 2010-1333(eISSN)
Tomographic Reconstruction of a Three-Dimensional Flow Field with Limited Interferometric Data
- Cha, Dong-Jin (Div. of Control and Instrumentation and Building Services Engineering, Taejon National University)
- Published : 2000.11.01
Abstract
Holographic interferometric tomography can provide reconstruction of instantaneous three-dimensional gross flow fields. The technique however confronts ill-posed reconstruction problems in practical applications. Experimental data are usually limited in projection and angular scanning when a field is captured instantaneously or under the obstruction of test models and test section enclosures. An algorithm, based on a series expansion method, has been developed to improve the reconstruction under the ill-posed conditions. A three-dimensional natural convection flow around two interacting isothermal cubes is experimentally investigated. The flow can provide a challenging reconstruction problem and lend itself to accurate numerical solution for comparison. The refractive index fields at two horizontal sections of the thermal plume with and without an opaque object are reconstructed at a limited view angle of 80
Keywords
- Three-dimensional flow fields;
- Flow diagnostics;
- Quantitative visualization;
- Holographic interferometric tomography;
- Ill-posed reconstruction