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September 5, 2026Experiments in FluidsOpen Access

Mean temperature field reconstruction of non-isothermal flow using Wollaston interferometry

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Authors

SKSimon M. KühneYSYaraslau SliavinRCRichard Carter

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Overview

Experimental validation study demonstrates quantitative mean temperature reconstruction in non-isothermal convective fluid flow, highlighting a robust optical diagnostic method.

Key Points

  • To quantitatively reconstruct the two-dimensional line-of-sight mean temperature distribution in a differentially heated convective flow using Wollaston shearing interferometry.
  • Recorded temperature-induced refractive index variations in silicone oil B5 within a differentially heated cylindrical annulus using Wollaston shearing interferometry.
  • Processed interferograms with a windowed Fourier transform algorithm to reconstruct two-dimensional line-of-sight mean temperature fields.
  • Conducted three-dimensional numerical fluid simulations to generate synthetic interferograms for qualitative and quantitative validation.
  • Reconstructed mean temperature fields exhibited moderate qualitative and quantitative agreement with numerical models in fringe structure, fringe density, and crescent-shaped convective flow patterns.
  • Remaining discrepancies between reconstructed and synthetic fields were linked to optical distortions, non-ideal thermal boundary conditions, and light deflection in regions with steep gradients.

Cite This Study

Kühne et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd4216b95aff0620eb7e7https://doi.org/10.1007/s00348-026-04309-9
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