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Energy Conversion Engineering Lab
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Understanding the heat and flow in fission and fusion reactors in order to use them safely.

AboutAbout the lab
Using limited energy safely and effectively.
The Energy Conversion Engineering Lab studies the physics and engineering of how energy is generated and converted in nuclear reactions, so that it can be used safely and efficiently.
By clarifying the underlying mechanisms and developing effective control methods, the lab aims to realize environmentally friendly energy systems.
In particular, it studies thermofluid engineering, which is closely tied to the safety and efficiency of fission and fusion reactors, and aims to establish a science of multiphase flow.
Key terms
- multiphase flow
- Flow in which phases with different properties, such as gas and liquid or liquid and solid, are mixed together. Boiling water is an example
- direct numerical simulation
- A method that solves the equations of flow with as few approximations as possible, reproducing even fine-scale turbulence by computation
- neural network
- A computational method modeled on the workings of biological brains. It learns from data and makes predictions
ResearchResearch themes
The lab studies thermofluid engineering, especially multiphase flow, which bears on the safety of nuclear reactors (fission and fusion) and the effective use of energy, through simulations and experiments. It is also pursuing research that uses machine learning to understand and predict fusion plasmas.
*Illustrative imageSolving multiphase flow with simulation
The lab develops direct numerical simulation methods to clarify multiphase flow and boiling in pipes and vessels. It also simulates the turbulence of wind and waves associated with the interaction between the atmosphere and the ocean.
*Illustrative imageSolving multiphase flow with experiments
The lab conducts fundamental experimental studies of multiphase flow in nuclear reactors and in chemical and mechanical equipment, such as boiling and convection of liquid metal in a magnetic field and gas–liquid flow across tube bundles.
*Illustrative imageVery small bubbles and flow in narrow channels
The lab investigates the mechanisms of turbulence in flows containing ultrafine bubbles, and surface-tension-dominated gas–liquid flow in narrow channels about 50 microns in diameter, aiming at applications in advanced technology and space engineering.
*Illustrative imagePredicting fusion plasmas with machine learning
Particle and heat flows in plasma are governed by small-scale fluctuations. The lab analyzes fluctuations made visible by computation and develops neural network models that quickly predict particle and heat flows.
MembersFaculty
The faculty members of the Energy Conversion Engineering Lab are a Professor, an Associate Professor, and a Lecturer.
- ProfessorTakehiko Yokomine
- Associate ProfessorEiji Hoashi
- LecturerEmi Narita
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Casing of a main circulation pump from the Greifswald Nuclear Power Plant” Siarhei Besarab / CC BY-SA 4.0 (cropped)
- Solving multiphase flow with simulation: “Lipid Islands on Soap Bubble” KarlGaff / CC BY 4.0 (cropped)
- Solving multiphase flow with experiments: “Test du module océanographique BOB (Bubbles OBservatory module) (Ifremer )” Olivier Dugornay / CC BY 4.0 (cropped)
- Very small bubbles and flow in narrow channels: “Mechanisms for Loading Microbubbles with Drug” Wolfpack bme 2022 / CC BY-SA 4.0 (cropped)
- Predicting fusion plasmas with machine learning: “Model of Tokamak Plasma” WikiHelper2221 / CC BY-SA 4.0 (cropped)
- Related lab (中性子源工学): “Núcleo del reactor nuclear RA-3, «Ciencia ficción», by Luis Gauna Pereira” Gaunper / CC BY-SA 4.0 (cropped)
- Related lab (プラズマ物理工学): “Tokamak schematic Smith” Smith Chris Llewellyn and Cowley Steve / CC BY 3.0 (cropped)
- Related lab (機械機能要素工学): “Ball-bearing-numbered” Niabot / CC BY-SA 3.0 (cropped)
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(航 空 宇宙力学): “Common mime (Papilio clytia) form dissimilis in flight Luang Prabang” Charles J. Sharp / CC BY-SA 4.0 (cropped)
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