CityU shows fluidity with nuclear equations lab

Henry Siu

City University has set up a lab to develop equations for nuclear plant software as part of its efforts to contribute to Hong Kong's Climate Action Plan 2050 of achieving net-zero carbon emissions in electricity generation by enhancing nuclear safety.

The JC STEM Lab of Innovative Thermo-Fluid Science was established with a HK$10 million donation from the Hong Kong Jockey Club Charities Trust.

It is being led by Takashi Hibiki, chair professor of thermal-fluid engineering, and two postdoctoral fellows.

Launched half a year ago, the five-year project focuses on two-phase flows involving solids, liquids and gases. Of particular interest to the researchers are liquid-gas flows that allow them to examine air pressures and bubble behavior.

Examples include pressure controls in petroleum pipelines and temperature monitoring in steam boilers, central air-conditioners, space stations and nuclear reactors.

Eric Lau Kwun-ting, one of the postdoctoral fellows, said: "The two-phase flow is crucial for nuclear technology - yet complex."

Hibiki said the lab is producing numerical simulation software for two-phase flows by first developing the necessary equations through experimentation and data analysis. "Once we develop them, they will be computer coded, which improves the prediction accuracy," he said.

Zhang Hengwei said: "The team is simulating steam-water flow in nuclear reactors to observe flow conditions and prevent emergencies, ensuring safe reactor operation."

Hibiki aims to publish around 50 theoretical equations. The equipment for validating data is expected to be set up within six months.

While the team has been collaborating well with local and international scholars, a lack of local talent has been a challenge.

Hibiki is exploring options such as engaging undergraduates, developing courses, hiring research assistants, or assigning final-year projects.