A group of researchers at the Massachusetts Institute of Technology (MIT) is developing an innovative approach to cooling nuclear reactor cores, which has the potential to significantly improve efficiency and safety. The focus is on the quenching process, when an overheated surface is rapidly cooled due to the rapid formation and destruction of a vapour film, which significantly enhances heat transfer. According to researcher Marco Graffiedi from MIT, in extreme conditions — such as inside a nuclear reactor or on a spacecraft — rapid and controlled heat removal is a key factor.
In particular, the team points out that the traditional Leidenfrost effect (where a film of vapour insulates the surface from the cooling liquid) slows down heat transfer. Researchers are working to quickly break down this film and increase the critical heat flux (CHF) — that is, the limit at which cooling by boiling is still effective. This solution can be used both in the new generation of ground-based nuclear facilities and in compact reactors for space missions, since effective cooling is one of the key factors in the safety and durability of a nuclear facility.
How does it work? This new method of cooling nuclear reactors works by exploiting a physical phenomenon known as the Leidenfrost effect. When a very hot surface comes into contact with a liquid, a thin film of vapour forms, insulating it from the cooling agent and thus slowing down the transfer of heat. The problem is that this effect slows down cooling. MIT researchers have found a way to control and quickly destroy this vapour film, allowing heat exchange to occur much faster. As a result, the reactor can remove more heat, which increases its efficiency and safety. This decision is important both for nuclear reactors on Earth and for those that may be used in space, where effective cooling is particularly critical.
Why is this important? In the context of future space missions, compact nuclear reactors are becoming a promising source of high-density energy — for example, for long-duration flights, bases on the Moon or Mars, or even space propulsion. New cooling methods, such as the quench approach described above, allow for better control of heat dissipation in confined spaces, increased reliability, and reduced cooling system weight. This means smaller radiators, lower mass costs and, as a result, more payload for research and astronomical instruments. In addition, effective core cooling reduces radiation protection and thermal control requirements, which is critical for missions far from Earth. Thus, the technology could become an important behind-the-scenes element for the energy and infrastructure of extraterrestrial colonies or observatories.
How exactly are space missions planned? What stages are involved before launch and after the spacecraft returns to Earth? From idea to actual launch, it is a complex and multifaceted process involving numerous technical calculations, tests and coordination between different teams. In our article ‘How space missions are planned: from concept to launch and return,’ we discuss the main stages of planning space missions, as well as how the safety and success of such missions are ensured.
