Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Nakatsuka, Toru; Yoshida, Hiroyuki; Takase, Kazuyuki
Nihon Kikai Gakkai 2009-Nendo Nenji Taikai Koen Rombunshu, Vol.3, p.141 - 142, 2009/09
In the thermal hydraulic design of supercritical water-cooled reactor, it is required to establish a design technique which can precisely predict heat transfer deterioration of supercritical water as the core coolant. The mechanism of heat transfer deterioration has not been figured out yet. In the present study, results of preliminary surveys on several turbulence models are reported. Large eddy simulation shows the most promising results for predictions of the heat transfer deterioration with a high accuracy.
production reactor for open-cycle thermochemical IS processKubo, Shinji; Onuki, Kaoru; Naito, Masaaki*; Tachibana, Yukio
Nihon Kikai Gakkai 2009-Nendo Nenji Taikai Koen Rombunshu, Vol.3, p.151 - 152, 2009/09
Merits of open-cycle thermochemical processes are characterized as compared with closed-cycle thermochemical processes to make water-splitting by unnecessity of high-temperature equipments, acceptable low thermal efficiency than water electrolysis to produce hydrogen, and conversions of unwanted materials into valuable materials. This study focuses a open cycle process to produce hydrogen and sulfuric acid from water and sulfur dioxide which is obtained from sulfur of general industry wastes. Improvement of hydrogen iodide decomposition rate by absorptions of reactant of iodine into active carbon was adapted to measure thermal burden on hydrogen production section. A heat requirement to drive a hydrogen production reactor with active carbon was estimated to be 194 kJ/mol-H, thereby heat input of total process was reduced from 6380 without active carbon to 1480 kJ/mol-H with that.