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 |