جستجوی مقالات مرتبط با کلیدواژه "hydrogen fluoride" در نشریات گروه "فیزیک"

The Boltzmann equation which describes binary collisions between molecules is a very important equation in physics and fluid dynamics. Direct Monte Carlo simulation is one of the methods to solve the Boltzmann equation. The moisture can leak to the fluid pipelines in the various places of cascades so many times through the enrichment operations since the pressure of the most enrichment process units is less than the atmospheric pressure. It causes the solid uranium precipitation on the inner surfaces of rotor and HF production upon the reaction with UF6. In the present work, the effect of concentration and total pressure inside a hypothetical centrifuge for binary component conditions (ZUF6=0.97, ZHF=0.03), (ZUF6=0.93, ZHF=0.07), (ZUF6=0.9, ZHF=0.1), (ZUF6=0.85, ZHF=0.15), and three component conditions (ZUF6=0.9, ZHF=0.05, ZAir=0.05) and (ZUF6=0.8, ZHF=0.1, ZAir=0.1) have been investigated. The results have been compared with those of the Boltzmann distribution function. Moreover, increment in the amount of light gas along with UF6 results in the decrement of ρνz.

High reactivity of uranium hexafluride compound is responsible for the impurity production of hydrogen fluoride in the enrichment industry process. The presence of this interference gas will disrupt uranium enrichment process. For this reason, measurement of hydrogen fluoride gas in uranium hexafluoride matrix as one of the important factors in the enrichment industry was carried out by FTIR spectrometry. Using of a new manifold system and a 10 m pathlength reflectance gas cell can lead to perform the analysis of hydrogen fluoride in the easier and more appropriate conditions than the ASTM method. The results obtained from the optimization of the present method are as flow: reduction of utilized UF6 (≈ 80%), elimination of liquid N2 for sample preparation, and simplification of sampling. Among the five standards and international regulations available, the ISO/IEC 17025 standard considerations is used, and verification parameters such as linearity, accuracy, precision, detection limit, quantization limit, and uncertainty of the results for the effect of the existing errors were studied.

The flow passed chemical traps is a mixture of light gas, hydrogen fluoride and uranium hexafluoride. It is necessary to take samples from the chemical traps output flow, to assure the accurate operation, non-saturation of adsorbent, proper loading and to control the output concentration of hydrogen fluoride and uranium hexafluoride. The routine approach for sampling is impossible because of the process of continuity and vacuum conditions. A procedure for the chemical traps output sampling is introduced in this paper under the assumption of the lack of uranium hexafluoride at the output of the chemical trap, and its effective parameter was optimized. As a result, the sampling time and pressure which are considered as the most important parameter were evaluated and their optimized values were estimated.