scholarly journals A Steady State Hydraulic Model of a Karst Aquifer

2007 ◽  
Vol 36 (2) ◽  
Author(s):  
Janez Turk
Keyword(s):  
Steady State ◽  
Karst Aquifer ◽  
Hydraulic Model

scholarly journals Hydraulic model of steady state multiphase flow in wellbore annuli

2014 ◽  
Vol 41 (3) ◽  
pp. 399-407 ◽  
Author(s):  
Bangtang YIN ◽  
Xiangfang LI ◽  
Baojiang SUN ◽  
Hongquan ZHANG
Keyword(s):  
Steady State ◽  
Multiphase Flow ◽  
Hydraulic Model

Nuclear coupled thermal hydraulic analysis of fast transient depressurization in supercritical channels

2017 ◽  
Vol 27 (5) ◽  
pp. 1158-1171 ◽  
Author(s):  
Goutam Dutta ◽  
Yashasvi Giridhar
Keyword(s):  
Steady State ◽  
Case Studies ◽  
Hydraulic Model ◽  
Supercritical Pressure ◽  
Time Dependent ◽  
Content Type ◽  
Exit Pressure ◽  
Pressure Water ◽  
Transient Case ◽  
Supercritical Pressure Water

Purpose The objective of the present work is to simulate the nuclear coupled thermal–hydraulic fast transient case studies for a vertically up-flowing supercritical pressure water channel of circular cross section. The emphasis is on analyzing the phenomenon of the deterioration in heat transfer (DHT) inside the channel subjected to sharp pressure variations. Design/methodology/approach The thermal–hydraulic model, THRUST, is integrated with the neutron point kinetic (NPK) solver to account for the non-linear interactions between the thermal–hydraulic and neutronic temperature and density reactivity feedback effects. The model implemented and studied accounts for the time-dependent reactor power and is used to analyze various steady-state and flow-induced transient case studies (time-dependent and step change in exit pressure). Findings There is good agreement in the predicted behavior of the supercritical water pressure system with that of the available experimental data for the steady-state case. The event of DHT in the second transient case (step decrease in exit pressure) is found to be more severe than that of exponential pressure decrease. Originality/value This study evaluated a novel implementation of the thermal–hydraulic model, THRUST, integrated with NPKs applied to supercritical pressure water systems for predicting DHT.

scholarly journals Development of a Coupled Code for Steady-State Analysis of the Graphite-Moderated Channel Type Molten Salt Reactor

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Long He ◽  
Cheng-Gang Yu ◽  
Wei Guo ◽  
Ye Dai ◽  
Hai-Ling Wang ◽  
...  
Keyword(s):  
Steady State ◽  
Density Distribution ◽  
Molten Salt ◽  
Power Distribution ◽  
Three Dimensional ◽  
Flow Distribution ◽  
Hydraulic Model ◽  
Molten Salt Reactor ◽  
Fuel Density ◽  
Channel Type

The molten salt reactor (MSR) is one of the six advanced reactor concepts selected by Generation IV International Forum (GIF) because of its inherent safety and the promising capabilities of TRU transmutation and Th-U breeding. In this study, a three-dimensional thermal-hydraulic model (3DTH) is developed for evaluating the steady-state performance of the graphite-moderated channel type MSR. The coupled code is developed by exchanging the power distribution, temperature, and fuel density distribution between SCALE and 3DTH. Firstly, the thermal-hydraulic model of the coupled code is validated by RELAP5 code. Then, the mass flow distribution, temperature field, keff, and power density distribution for a conceptual design of the 2MWt experimental molten salt reactor are calculated and analyzed by the coupled code under both normal operating situation and the central fuel assembly partly blocked situation. The simulated results are conductive to facilitate the understanding of the steady behavior of the graphite-moderated channel type MSR.

Studies on Water in the Hydration Chamber of a Modified Electron Microscope

1970 ◽  
Vol 28 ◽  
pp. 544-545
Author(s):  
R. C. Moretz ◽  
G. G. Hausner ◽  
D. F. Parsons
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electron Microscope ◽  
Steady State ◽  
Room Temperature ◽  
Small Mass ◽  
Equilibrium Pressure ◽  
Biological Objects ◽  
Mechanical Pump ◽  
Differential Pumping

Use of the electron microscope to examine wet objects is possible due to the small mass thickness of the equilibrium pressure of water vapor at room temperature. Previous attempts to examine hydrated biological objects and water itself used a chamber consisting of two small apertures sealed by two thin films. Extensive work in our laboratory showed that such films have an 80% failure rate when wet. Using the principle of differential pumping of the microscope column, we can use open apertures in place of thin film windows.Fig. 1 shows the modified Siemens la specimen chamber with the connections to the water supply and the auxiliary pumping station. A mechanical pump is connected to the vapor supply via a 100μ aperture to maintain steady-state conditions.

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