巻号一覧
後続誌
32 巻, 12 号
選択された号の論文の6件中1～6を表示しています
- |<
- <
- 1
- >
- >|
-
解析上の困難さに遭遇する課題有冨 正憲, 三島 嘉一郎, 堀 豊, 平野 雅司1990 年 32 巻 12 号 p. 1191-1200
発行日: 1990/12/30
公開日: 2010/01/08
ジャーナル フリーThe present status of numerical analysis on two-phase flow dynamics has been reviewed and systematized in the Working Group of Two-Phase Flow in the Special Committee on Advanced Numerical Analysis of Thermal Hydraulics, AESJ. It is seen from the research study that the present technology of numerical analysis still has many problems to be solved through further investigations. Then, phenomena of difficulty in analyzing numerically have been picked up. It is made clear the phenomena may be classified into three categories; (1) related to flow condition, (2) related to thermal non-equilibrium state and (3) related to numerical method.
Common problems to many researchers are required for the further investigations. Hence, the benchmark problems have been selected based on these categories. The following are represented in this paper:
(1) Purpose and methodology of selecting the benchmark problems,
(2) Summaries of the benchmark problems concerning flow condition and thermal non-equilibrium state which have been selected and authorized by many specialists.抄録全体を表示PDF形式でダウンロード (853K) -
村岡 克紀, 前田 三男1990 年 32 巻 12 号 p. 1201-1204
発行日: 1990/12/30
公開日: 2009/04/21
ジャーナル フリーPDF形式でダウンロード (6093K) -
井岡 郁夫, 鈴木 邦彦, 稲垣 嘉之, 国富 一彦, 宮本 喜晟, 下村 寛昭1990 年 32 巻 12 号 p. 1221-1223
発行日: 1990/12/30
公開日: 2009/04/21
ジャーナル フリーPDF形式でダウンロード (2772K) -
鈴木 隆次, 雨貝 信治, 中村 治人, 村岡 進1990 年 32 巻 12 号 p. 1224-1231
発行日: 1990/12/30
公開日: 2009/04/21
ジャーナル フリーA high level waste (HLW) package system with buffer material was designed considering a long-term storage system of the packaged waste in a repository.
For the γ-ray shielding, the buffer material of high density was prepared using bentonite powder and heavy sand of zircon. The density of the dry buffer material was about 3g/cm3.
Heater test was carried out to study thermal characteristics of this buffer material and the waste package system. The buffer material was heated by an electric heater which was set at the center of the package to simulate the decay heat generation of HLW. The thermal conductivity of the buffer material was calculated from temperature distribution in the package. It was found that the measured thermal conductivity of the buffer material vary with the electric power of the heater and the radial distance from the heater surface. The thermal conductivity was in the range of 0.720-1.070W/m·K at the electric power of the heater of 0.3kW, and it was in the range of 0.685-1.410W/m·K at 0.7kW. This is attributed to the water migration in the buffer material, caused by the heat flux.
The changes of the swelling pressure and the water uptake rate in the buffer material was measured to study swelling pressure, water uptake rate and water diffusion coefficient of the buffer material by immersing double distilled water from the outside of the package. Consequently the water diffusion coefficient in the buffer material was calculated to be 2.5×10-10mm2/s.抄録全体を表示PDF形式でダウンロード (5684K) -
自然降雨条件下の非吸着性トレーサの降下浸透特性五十嵐 敏文, 馬原 保典, 河西 基, 藤原 靖, 今村 聡, 下茂 道人1990 年 32 巻 12 号 p. 1232-1242
発行日: 1990/12/30
公開日: 2009/04/21
ジャーナル フリーTo evaluate the characteristics of groundwater flow and nuclide migration through unsaturated loamy soil, various field tracer experiments have been carried out using both nonreactive tracers (D2O, Br-) and reactive tracers (Co, Sr, Cs). This paper discusses the migration characteristics of nonreactive tracers under the direct influence of natural rainfall and evapotranspiration.
D2O was a more conservative tracer than Br- ion to evaluate an unsaturated flow because the infiltration rate of Br- ion was slower than that of D2O owing to anion adsorption of allophane, a major mineral in loamy soil. The longitudinal and transverse dispersion coefficients were calculated from the spatial distributions of D2O concentration. The linear relation between the maximum concentration depth of D2O and the cumulative rainfall indicates that the rainfall gives a significant influence on the infiltration rate while the evapotranspiration gives little influence.抄録全体を表示PDF形式でダウンロード (699K) -
市原 格, 鬼塚 初喜, 川上 文明, 小花和 平一郎, 武田 邦彦1990 年 32 巻 12 号 p. 1243-1248
発行日: 1990/12/30
公開日: 2009/04/21
ジャーナル フリーThe chemical uranium isotope separation, that is ultra multistage process using adsorptiondesorption reactions, was studied in the temperature range 60-133°C in hydrochloric acid. It was cleared that the activation energy of the equilibrium height (Hq) was very close to that of electron exchange reaction rate (ket) between U4+ and UO22+ under these conditions, and the observed Hq was found to be about one order smaller than theoretical value evaluated from ket, in hydrochloric solution. The experimental studies suggest that the electron exchange reaction in the ion exchanger might be about one order faster than that in solution.抄録全体を表示PDF形式でダウンロード (412K)
- |<
- <
- 1
- >
- >|