Near-wall Phenomena in Nucleate Boiling

il y a 1 semaine

GifsurYvette, France CEA Temps plein

Position description

**Category**:

- Thermohydraulics and fluid mechanics

**Contract**:

- Postdoc

**Job title**:

- Near-wall phenomena in nucleate boiling H/F

**Subject**:

- Near-wall phenomena in nucleate boiling

**Contract duration (months)**:

- 12

**Job description**:
Another near-wall feature at nucleate boiling is the formation of thin liquid films that can occur during the growth of vapor bubbles on the wall. This liquid layer with thickness up to a few microns (thus named ''microlayer'') is formed between the wall and the liquid-vapor interface of the bubble. The microlayer is a desired feature in boiling-based equipment. It acts as a heat transfer bridge, allowing a heat flux in the order of MW/m2 to be transferred from the wall to the liquid-vapor interface, promoting an efficient cooling of the wall. This results in the microlayer evaporation and its contribution to the overall bubble growth can be up to 50%. The mechanism of microlayer formation, dry-spot dynamics and the related near-wall heat transfer phenomena are therefore an active research topic within the boiling community.Experiments performed in order to measure near-wall parameters, such as microlayer thickness and the dry spot size, are vital to validate novel physical models developed at CEA, in particular at STMF the ones implemented in the numerical simulations with TrioCFD. At STMF, a novel experimental installation has been developed in the framework of a PhD thesis to study the near-wall phenomena in boiling. The experimental setup uses advanced high-speed and high-resolution optical diagnostics (white light interferometry, infrared thermography and shadowgraphy) to measure microlayer thickness, wall temperature distribution and macroscopic bubble shape. The installation is, therefore, able to fully characterize the near-wall phenomena and provide data for the validation of numerical simulations.
- The postdoctoral researcher will benefit from this experimental installation to perform experiments in a variety of conditions of input power and subcooling, for instance, to study the physical phenomena related to the microlayer dynamics, heat transfer and dry-spot at bubble growth in nucleate boiling. The submission of one or two scientific papers within the postdoctoral period is expected.**Applicant Profile**:
Position location

**Site**:

- Saclay

**Job location**:

- France, Ile-de-France, Essonne (91)

**Location**:

- Gif-sur-Yvette

**Languages**:

- English (Fluent)

Requester

**Position start date**:

- 01/03/2024

General information

**Organisation**:
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas:
- defence and security,
- nuclear energy (fission and fusion),
- technological research for industry,
- fundamental research in the physical sciences and life sciences.

Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
- The CEA is established in ten centers spread throughout France**Reference **:2023-30220**Description de l'unité **:

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