Abstract
To discuss a suitable porous structure for helium gas cooling under high heat flux conditions of a nuclear fusion divertor, we first evaluate effective thermal conductivity of sintered copper-particles in a simple cubic lattice by direct numerical heat-conduction simulation. The simulation reveals that the effective thermal conductivity of the sintered copper-particle highly depends on the contacting state of each particle, which leads to the difficulty for the thermal design. To cope with this difficulty, we newly propose utilization of a unidirectional porous tube formed by explosive compression technology. Quantitative prediction of its cooling potential using the heat transfer correlation equation demonstrates that the heat transfer coefficient of the helium gas cooling at the pressure of 10 MPa exceeds 30,000 W/m2/K at the inlet flow velocity of 25 m/s, which verifies that the unidirectional porous copper tubes can be a candidate for the gas-cooled divertor concept.
Highlights
The surrounding of the core plasma in a fusion reactor contains structures and equipment exposed to extremely severe heat loads, such as the first wall and the divertor
We newly propose the introduction of a unidirectional porous tube formed by explosive compression technology, which was developed by Hokamoto et al [26], and demonstrate its cooling potential by the heat transfer correlation equation constructed by the author’s heat transfer experiments
The simulation revealed that the effective thermal conductivity of the sintered copperdepends on the contacting state of the particles, which makes it difficult to predict the exact particle is in the range from 15.1 to 114.6 W/m/K and highly temperature of divertor armor material
Summary
The surrounding of the core plasma in a fusion reactor contains structures and equipment exposed to extremely severe heat loads, such as the first wall and the divertor. The cooling performance of the screw tube proved higher than that of the swirl tube with the same pumping power because of the effect of increased heat transfer area and fluid stirring in the vicinity of the tube wall As another water-cooling technique for the divertor, Toda has proposed an ultra-low flowrate-type evaporative heat transfer device, EVAPORON (Evaporated Fluid Porous Thermodevice), which utilizes the latent heat of vaporization of a cooling liquid in a metal porous medium [5]. 3D-printed porous “copper” with micro/mini channels seems to be considerably difficult in the conventional 3D-printed technology Against these backgrounds, in this study, we first focus on again the pros and cons of utilizing sintered copper-particles porous media with excellent thermal conductivity and vast heat transfer surface from the viewpoint of the high heat flux removal. Prediction of Effective Thermal Conductivity of Sintered Copper-Particles by Direct
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