scholarly journals Helium pressure increase inside GPHS clads: implications for formation of distended clads

2019 ◽  
Author(s):  
Roberta Nancy Mulford
Keyword(s):  
Pressure Increase ◽  
Helium Pressure

Helium Pressure Increase During a Quench of the Iseult Coil

2012 ◽  
Vol 22 (3) ◽  
pp. 4700604-4700604 ◽  
Author(s):  
C. Meuris ◽  
W. Abdel Maksoud ◽  
P. Bredy
Keyword(s):  
Pressure Increase ◽  
Helium Pressure

Numerical and experimental investigation on internal membrane pressure wave inside sealed structure

2013 ◽  
Vol 61 (3) ◽  
pp. 613-621 ◽  
Author(s):  
W. Barnat
Keyword(s):  
Experimental Investigation ◽  
Pressure Wave ◽  
Pressure Increase ◽  
Internal Organs ◽  
Pressure Impulse ◽  
Internal Membrane ◽  
Contaminated Area

Abstract The article presents an approach to modeling the internal membrane pressure wave inside a sealed structure. During an explosion near a vehicle when a pressure wave reaches a hull, a pressure wave inside arises due to the hull’s bottom and the deformation of sides. They act like the piston - membrane. This membrane transfers the pressure impulse into the vehicle’s interior. A pressure increase causes the damage of internal organs or even death of occupants. In case of an armor penetration the pressure increase may be even larger. One of basic methods to protect a crew is to open hatches. However, such a method cannot be used in a contaminated area.

Comparison of DSMC and CFD Models of Heat Transfer in a Rarefied Two-Dimensional Geometry

2018 ◽  
Author(s):  
Dilesh Maharjan ◽  
Mustafa Hadj-Nacer ◽  
Miles Greiner ◽  
Stefan K. Stefanov
Keyword(s):  
Heat Transfer ◽  
Rarefied Gas ◽  
Complex Geometry ◽  
Direct Simulation Monte Carlo ◽  
Accurate Method ◽  
Vacuum Drying ◽  
Helium Pressure ◽  
Two Dimensional ◽  
Dsmc Method ◽  
Cfd Simulations

During vacuum drying of used nuclear fuel (UNF) canisters, helium pressure is reduced to as low as 67 Pa to promote evaporation and removal of remaining water after draining process. At such low pressure, and considering the dimensions of the system, helium is mildly rarefied, which induces a thermal-resistance temperature-jump at gas–solid interfaces that contributes to the increase of cladding temperature. It is important to maintain the temperature of the cladding below roughly 400 °C to avoid radial hydride formation, which may cause cladding embrittlement during transportation and long-term storage. Direct Simulation Monte Carlo (DSMC) method is an accurate method to predict heat transfer and temperature under rarefied condition. However, it is not convenient for complex geometry like a UNF canister. Computational Fluid Dynamics (CFD) simulations are more convenient to apply but their accuracy for rarefied condition are not well established. This work seeks to validate the use of CFD simulations to model heat transfer through rarefied gas in simple two-dimensional geometry by comparing the results to the more accurate DSMC method. The geometry consists of a circular fuel rod centered inside a square cross-section enclosure filled with rarefied helium. The validated CFD model will be used later to accurately estimate the temperature of an UNF canister subjected to vacuum drying condition.

Prophylactic Use of Apraclonidine for Intraocular Pressure Increase After Nd:YAG Capsulotomies: Reply

1992 ◽  
Vol 114 (3) ◽  
pp. 378-379
Author(s):  
DAVID E. SILVERSTONE ◽  
STEPHEN F. BRINT ◽  
KENNETH W. OLANDER ◽  
ROBERT B. TAYLOR ◽  
GEORGE R. McCARTY ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Pressure Increase ◽  
Prophylactic Use

scholarly journals The detection and inhibition of free radical chain reactions

1942 ◽  
Vol 180 (982) ◽  
pp. 237-256 ◽  
Keyword(s):  
Nitric Oxide ◽  
Free Radical ◽  
Chemical Analysis ◽  
Diethyl Ether ◽  
Pressure Increase ◽  
Stationary States ◽  
Decomposition Rates ◽  
Radical Chain ◽  
Chain Reactions ◽  
Limiting Values

Part I. Comparison of nitric oxide and propylene as inhibitors The reduction by propylene of the rate of pressure increase in the decomposition of propaldehyde at 550° has been shown by chemical analysis to represent a true inhibition of the reaction, and not to be due n an important degree to an induced polymerization of the propylene. With propaldehyde and with diethyl ether the limiting values to which the decomposition rates are reduced by nitric oxide and by propylene respectively are the same, although much more propylene is required to produce a given degree of inhibition. From this it is concluded that the limiting rates are more probably those of independent non-chain processes, than those characteristic of stationary states where the inhibitor starts and stops chains with equal efficiency.

Menopause-related blood pressure increase and its relationship to age and body mass index: the SIMONA epidemiological study

2005 ◽  
Vol 23 (12) ◽  
pp. 2269-2276 ◽  
Author(s):  
Alberto Zanchetti ◽  
Rita Facchetti ◽  
Gian Carlo Cesana ◽  
Maria Grazia Modena ◽  
Anna Pirrelli ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Body Mass Index ◽  
Epidemiological Study ◽  
Body Mass ◽  
Pressure Increase ◽  
Blood Pressure Increase

Blood Pressure and Intraventricular Hemorrhage in Premature Infants

PEDIATRICS ◽  
1990 ◽  
Vol 86 (6) ◽  
pp. 1006-1007
Author(s):  
EDWARD H. PERRY ◽  
HENRIETTA S. BADA ◽  
JOHN D. DAY ◽  
SHELDON B. KORONES ◽  
KRISTOPHER L. ARHEART ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Birth Weight ◽  
Premature Infants ◽  
Intraventricular Hemorrhage ◽  
Stability Boundary ◽  
Mean Blood Pressure ◽  
Pressure Increase ◽  
Blood Pressure Increase ◽  
The Mean

In Reply.— We appreciate the interest and comments of Drs Puccio and Soliani regarding our article "Blood Pressure Increase, Birth Weight Dependent Stability Boundary and Intraventricular Hemorrhage."1 In response, we address the following points: 1. Although mean blood pressure (BP) values greater than 100 mm Hg were observed in some of our patients, these were quite rare. The mean BP was found to be less than 60 mm Hg 99% of the time. Thus, unless one is recording BPs through long periods and sampling quite often, the brief spikes likely would not be observed.

scholarly journals Experimental Studies on the Rheological and Hydraulic Performance of Palm Based Hydraulic Fluid

2014 ◽  
Vol 66 (3) ◽  
Author(s):  
W. B. Wan Nik ◽  
F. Zulkifli ◽  
S. S. Lam ◽  
M. M. Rahman ◽  
A. A. Yusof ◽  
...  
Keyword(s):  
Shear Rate ◽  
Palm Oil ◽  
Experimental Studies ◽  
Mechanical Efficiency ◽  
Hydraulic Performance ◽  
Pressure Increase ◽  
Major Influence ◽  
Hydraulic Fluid ◽  
Plant Oil ◽  
Hydraulic Test

Development of environmental friendly hydraulic fluid has a major influence in ecologically benign environment. The use of plant oil as hydraulic fluid would help to minimize hazardous pollution caused by accidental spillage, lower disposal costs of the used fluid and meet the environmental regulations. Hydraulic test rig was built to conduct endurance test where it can be operated continuously with several safety features. This research was conducted to evaluate the rheology elements and hydraulic performance of palm based hydraulic fluid. The palm oil shows decreasing trend in volumetric efficiency as the pressure increase while the mechanical efficiency increases as the pressure increase. Properties and characteristics of palm based hydraulic fluid were evaluated via rheology study. The effect of viscosity with temperature and shear rate was studied. The influence of shear rate and temperature on the variation of viscosity was clearly observed but temperature has more significant influence. Interpretations of rheological models indicate that this palm based hydraulic fluid belongs to pseudo-plastic category. Further analysis was done to fit the experimental data with two models and the findings show that Cross rheological model fits well with the experiment data. The plant oil was used in 1000 hours operation in a hydraulic system built in Universiti Malaysia Terengganu. The overall results suggest the potential substitution of palm oil as hydraulic fluid in marine applications.

Sign in / Sign up

Export Citation Format

Share Document