Post-Doc: Heat Transfer Characterization In Cryogenic Environments
Há 1 mês
Organisation/Company: CNRS
Department: Institut NEEL
Research Field: Engineering Physics
Researcher Profile: Recognised Researcher (R2)
Country: France
Application Deadline: 15 Dec 2024 - 00:00 (UTC)
Type of Contract: Temporary
Job Status: Full-time
Hours Per Week: 35
Offer Starting Date: 1 Mar 2025
Is the job funded through the EU Research Framework Programme? Not funded by a EU programme
Is the Job related to staff position within a Research Infrastructure? No
Offer Description Liquid hydrogen is characterized by several important limitations and challenges that restrict its current use. One of them is the cryogenic boiling losses associated with storing, transporting and handling of liquid hydrogen and which can consume up to 40% of its available combustion energy. Molecular hydrogen exists in two allotropic (spin isomers) forms, ortho-hydrogen and para-hydrogen, differentiated by the nuclear spin state of the protons in each hydrogen atom. For a given temperature, the equilibrium ratio of ortho- to para-hydrogen concentrations can be calculated, but the kinetics of the exothermic conversion can take weeks when the temperature is rapidly dropped. Therefore, reliable in situ measurement methods of this concentration are important for the hydrogen industrial sector. One way to measure these concentrations consists in using the thermal properties of hydrogen, such as the enthalpy difference or the difference of thermal conductivity between ortho and para hydrogen. Transport of heat in a fluid is usually assumed to be determined together by advection and diffusion phenomena. In some specific cases, transport of heat relies upon complex processes at molecular scale that can potentially deviate from conventional transport by heat diffusion. In these conditions, the thermal conductivity is no longer a constant parameter but varies in time and space, leading either to faster or slower heat transport. Fluids close to super-critical conditions like dihydrogen in cryogenic conditions exhibit a super diffusivity of heat with a transport much faster than expected by normal diffusion. A solid understanding of the anomalous transport properties of heat in unconventional conditions opens the way for more robust and faster concentration estimates based on thermal conductivity measurements. The role of the person recruited will be to develop an innovative sensor for reliably measuring the chemical composition of a gas mixture, based on the difference in thermal conductivity of the gases.
Responsibilities Design a cryostat at the Néel Institute.
Development and fabrication of an innovative sensor for chemical composition of a gaseous mixture based on heat transfer at various temperatures at Mines Saint-Etienne. Determination of measurement uncertainties.
Adaptation of an existing gas bench with associated instrumentation for the generation of gas mixtures.
Modeling of the sensor, based on physical first principles, as well as a behavior modeling based on the experimental sensor's responses to various excitations to validate measurements in laboratory conditions.
Validation of the measurement system and gas mixture composition prediction models on control gases (N2/O2/CO2) under laboratory conditions and at different temperatures.
About the Institut Néel The Institut Néel is a CNRS laboratory with around 300 permanent staff and 150 PhD students and post-docs. As a fundamental research laboratory in condensed matter physics, the Néel Institute also forges interdisciplinary links with chemistry, engineering, and the life sciences. The main areas of research are magnetism and spin electronics, photonics and non-linear optics, quantum, molecular and wide band gap electronics, correlated systems, quantum fluids and superconductivity, as well as materials for energy. The post-doc recruited will join the Matériaux Rayonnements Structure (MRS) team, whose expertise ranges from elaboration methods to structural and functional characterization, supported by theoretical developments. This team has been working for many years on metal hydrides for hydrogen storage, and has several hydrogen test benches at its disposal. Researchers at the Institut Néel benefit from the support of a dozen technology clusters, and in particular the Cryogenics cluster, which focuses on the design, production and development of original cryogenic devices.
About Mines Saint-Etienne Mines Saint-Etienne reflects the commitment of our teaching and research staff and our administrative and technical staff to meeting the challenges of the major transitions of the 21st century. With over 200 years of history and the excellence of our staff and students, we are committed to education, research, innovation, transfer to industry and scientific, technical and industrial culture. With 2,500 students, 500 staff and a budget of €50m, we have 3 campuses dedicated to the industry of the future, health and well-being and digital sovereignty and microelectronics, located in 3 major cities: Saint-Etienne, Lyon and Aix-Marseille-Provence. Ranked in the national Top 10 by the magazine l'Etudiant and in the international rankings, Mines Saint-Etienne is a member of the T.I.M.E. network of the world's best technological universities and, through its membership of the Institut Mines-Telecom, a member of the European University EULIST. The SPIN centre (Science of Industrial and Natural Processes), which will be heavily involved in the post-doc, is developing its expertise within Mines Saint-Etienne in the field of Process Engineering applied to dispersed systems: grains, particles, drops, bubbles and porous media. He also has skills in the development of sensors and instrumentation.
Minimum Requirements PhD in Physics of transport processes, Thermodynamics, Condensed-Matter Physics or a closely related discipline.
The project's subject includes different disciplines (fluid mechanics, transfers, engineering, automatics) and involves also digital and experimental development.
Strong versatility is expected from the candidate. Excellent written and oral communication skills.
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