Development of a Phase Change Measurement Device - Nantes, France - GEPEA - UMR CNRS 6144 - ONIRIS

Description

Development of a phase change measurement device for superchilling process:

• Réf

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ABG-115787

• Sujet de Thèse 12/07/2023
• Contrat doctoral
• GEPEA
• UMR CNRS ONIRIS
• Lieu de travail
• Nantes
• Pays de la Loire
• France
• Intitulé du sujet
• Development of a phase change measurement device for superchilling process
• Champs scientifiques
• Génie des procédés
• Sciences de l'ingénieur

• Mots clés

• Heat transfer, Phase change, Electromagnetism, Modelling, Experimentation, Superchilling
  Description du sujet:

Context :
development of innovative technologies to control superchilling

• A large proportion of the food we consume has to be refrigerated, and a cold chain offering extended shelflife would help reduce losses and avoid the CO2 emissions associated with inefficient preservation systems. While freezing allows for a long shelflife, it often results in a loss of product quality and requires high energy consumption, given the very low temperatures involved. Superchilling, an "intermediary" between freezing and refrigeration, is a highpotential process that consists of partially freezing the product. To do this, the product is cooled to a temperature slightly below its freezing temperature, and then maintained at the same temperature during storage. Knowledge of the overall freezing rate (proportion of ice to water), which must be around 30%, is a key parameter in controlling this new process, but it is also one of the most difficult to measure. The aim of this thesis is therefore to develop nonintrusive measurement systems using electromagnetic waves to characterize this freezing rate.

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Scientific issues, objectives and progress of the thesis The PhD student will- 2. participate in the development of the entire experimental set-up (freezing system + sensors),
3. carry out partial freezing experiments on various model products (varying water and salt contents) and define standard methods for measuring ice content (calorimetry),
4. study the dielectric characteristics of products as a function of their composition and state (frozen, unfrozen) at different frequencies,
5. develop a numerical model describing the entire process in order to obtain local responses (in particular, spatial distribution of ice content), and finally
6.

analyze and interpret all the results in order to propose a non-intrusive measuring device.- He/she will also be required to provide regular reports to the various parties involved in the project.

Prise de fonction:

• 06/11/2023
  Nature du financement:
• Contrat doctoral

Précisions sur le financement:


Présentation établissement et labo d'accueil:

• GEPEA
• UMR CNRS ONIRIS

Site web:


Intitulé du doctorat:

• Docteur en Génie des Procédés
  Pays d'obtention du doctorat:
• France

Etablissement délivrant le doctorat:

• Université de Nantes
  Ecole doctorale:
• Sciences pour l'ingénieur (SPI) 08/09/2023