Remountable high temperature superconducting magnet

Page 1 : Remountable HTS magnet
Page 2 : Mechanical joint of a HTS conductor

Page 3 : Heat transfer enhancement of LN2
with metal porous media

Page 4 : Other superconducting applications
Page 5 : Published papers

Heat transfer enhancement of LN2 with metal porous media

Joule heating in the jointing region becomes serious problem because the local heat generation is very large if the remountable HTS magnet is applied to a DEMO fusion reactor. Cooling method using boiling becomes attractive since the latent heat of the coolant works effectively. The cryogenic coolant such as LHe or LN2, however, has a problem that boiling state rapidly transits to the film boiling because their latent heat, viscosity and surface tension are much lower than those of water.

In order to solve the above problem, we proposed heat transfer enhancement of cryogenic coolants with sintered metal porous media. The sintered metal porous media are made by sintering the metal powders or fibers. They can prevent the boiling state from transiting to the film boiling by providing coolant to the porous media with their capillary effect. Therefore porous media can remove heat flux with latent heat of coolant.

Based on the above background, we are investigating the heat transfer enhancement technique with metal porous media using LN2.

Schematic of heat removal system using metal porous media

Experimental set-up

We are using LN2 loop shown in the following figure to investigate the heat transfer enhancement of LN2 with metal porous media.

Experimental set-up

Test section