Communication Dans Un Congrès Année : 2024

Optical techniques for near-wall phenomena in nucleate boiling

Résumé

We report an experimental method consisting of high-speed and high-resolution optical techniques to investigate the near-wall phenomena in nucleate pool boiling. Our focus is on the micrometric liquid layer (microlayer) that can be formed between the wall and the vapor-liquid interface during the bubble growth. We also investigate the wall dewetting dynamics: the dry spot spreading. The installation performs simultaneous and synchronous measurements of the microlayer thickness profile, the wall temperature distribution and the bubble macroscopic shape by white-light interferometry, infrared thermography and sidewise shadowgraphy, respectively, at 4000 frames per second. The novelty is the white light interferometry, which provides precise data on microlayer thickness. The calibration and validation procedures of these optical techniques are discussed along with the post-processing techniques used for image treatment. We also show the results obtained for a nucleate boiling experiment on single bubble growth. These advanced techniques aim at understanding the fundamental aspects of the near-wall phenomena in nucleate boiling heat transfer, in particular the physics of microlayer formation, its evaporation, the dewetting dynamics and the associated heat transfer. The experimental data can be used to support the development of novel physical models.
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Dates et versions

cea-04922348 , version 1 (30-01-2025)

Identifiants

  • HAL Id : cea-04922348 , version 1

Citer

Cassiano Tecchio, Benjamin Cariteau, Gilbert Zalczer, Simon Vassant, Pere Roca I Cabarrocas, et al.. Optical techniques for near-wall phenomena in nucleate boiling. SWINTH 2024 - Specialist Workshop on Advanced Instrumentation and Measurement Techniques for Nuclear Reactor Thermal-Hydraulics and Severe Accidents, Jun 2024, Dresde, Germany. pp.31. ⟨cea-04922348⟩
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