scholarly journals Compensation of phase drifts caused by ambient humidity, temperature and pressure changes for continuously operating interferometers

2019 ◽  
Vol 14 (11) ◽  
pp. P11016-P11016
Author(s):  
K.J. Brunner ◽  
J. Knauer ◽  
J. Meineke ◽  
M. Stern ◽  
M. Hirsch ◽  
...  
Keyword(s):  
Ambient Humidity ◽  
Temperature And Pressure ◽  
Pressure Changes

scholarly journals Assessment of Piezoelectric Sensors for the Acquisition of Steady Melt Pressures in Polymer Extrusion

Fluids ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 66
Author(s):  
Sónia Costa ◽  
Paulo Teixeira ◽  
José Covas ◽  
Loic Hilliou
Keyword(s):  
Polymer Processing ◽  
Piezoelectric Transducers ◽  
Piezoelectric Sensors ◽  
Flow Curves ◽  
Signal Drift ◽  
Temperature And Pressure ◽  
Pressure Independent ◽  
Pressure Changes ◽  
Different Levels ◽  
Slit Die

Piezoelectric sensors have made their way into polymer processing and rheometry applications, in particular when small pressure changes with very fast dynamics are to be measured. However, no validation of their use for steady shear rheometry is available in the literature. Here, a rheological slit die was designed and constructed to allow for the direct comparison of pressure data measured with conventional and piezoelectric transducers. The calibration of piezoelectric sensors is presented together with a methodology to correct the data from the inherent signal drift, which is shown to be temperature and pressure independent. Flow curves are measured for polymers showing different levels of viscoelasticity. Piezoelectric slit rheometry is validated and its advantage for the rheology of thermodegradable materials with viscosity below 100 Pa·s is highlighted.

DECOMPOSITION PRESSURES OF FERRIC SULPHATE AND ALUMINUM SULPHATE

1960 ◽  
Vol 38 (11) ◽  
pp. 2196-2202 ◽  
Author(s):  
N. A. Warner ◽  
T. R. Ingraham
Keyword(s):  
Gas Phase ◽  
Static System ◽  
Ferric Sulphate ◽  
Kcal Mole ◽  
Aluminum Sulphate ◽  
Temperature And Pressure ◽  
Pressure Changes ◽  
Mercury Manometer ◽  
Decomposition Pressure ◽  
Gas Pressures

The gas pressures over samples of anhydrous ferric sulphate and anhydrous aluminum sulphate have been measured in a static system, using a mercury manometer in which the exposed surface was covered with a flexible Pyrex bellows. The calculated ΔH for the decomposition of Fe2(SO4)3 was +135.4 kcal/mole. It was not possible to calculate the ΔH for the Al2(SO4)3 decomposition, because a discrete aluminum oxide with singular thermodynamic properties was not obtained.In the Fe2(SO4)3 system, the fraction of SO3 in the gas phase was found to be almost constant over the range of temperature and pressure changes used in the study.At any given temperature, the decomposition pressure over a ferric sulphate sample is greater than that over an aluminum sulphate sample, thus indicating that preferential decomposition of ferric sulphate should be thermodynamically feasible in mixtures of ferric sulphate and aluminum sulphate.

Epidural versus subdural spinal cord cooling: cerebrospinal fluid temperature and pressure changes

2000 ◽  
Vol 70 (1) ◽  
pp. 222-227 ◽  
Author(s):  
Sven A Meylaerts ◽  
Cor J Kalkman ◽  
Peter de Haan ◽  
Marjolein Porsius ◽  
Michael J.H.M Jacobs
Keyword(s):  
Spinal Cord ◽  
Cerebrospinal Fluid ◽  
Fluid Temperature ◽  
Temperature And Pressure ◽  
Pressure Changes

Analysis of Hot Oil Pipeline Stress Influencing Factors

2014 ◽  
Vol 887-888 ◽  
pp. 899-902
Author(s):  
Xiao Nan Wu ◽  
Shi Juan Wu ◽  
Hong Fang Lu ◽  
Jie Wan ◽  
Jia Li Liu ◽  
...  
Keyword(s):  
Crude Oil ◽  
High Viscosity ◽  
Analysis Model ◽  
Long Distance ◽  
Oil Pipeline ◽  
Software Analysis ◽  
Key Points ◽  
Temperature And Pressure ◽  
Pressure Changes ◽  
The Impact

In order to reduce the viscosity of crude oil for transport, we often use the way of heating delivery for high pour point, high wax, and high viscosity oil. Crude oil at high temperature, through long-distance transmission, the temperature and pressure changes on the piping stress greater impact. In this paper, in order to explore the main factor of hot oil pipeline stress and the location of key points, we build the XX hot oil pipeline stress analysis model used CAESAR II software, analysis of the impact of changes in temperature and pressure on piping stress when hot oil pipeline running, draw hot oil pipeline stress distribution, clearly identifies the location of key points of stress concentration, and we have come to that temperature is a major factor in generating pipe stress.

Microstructure Evolution Across Interfaces of Heterogeneous Metal Systems Under Ultrasonic Impact

2004 ◽  
Vol 854 ◽  
Author(s):  
Youhong Li ◽  
Yinon Ashkenazy ◽  
Robert S. Averback
Keyword(s):  
Large Scale ◽  
Shock Loading ◽  
Interfacial Strength ◽  
Interface Layer ◽  
Structural Defects ◽  
Interfacial Region ◽  
Heterogeneous Model ◽  
Interfacial Defects ◽  
Temperature And Pressure ◽  
Pressure Changes

ABSTRACTLarge-scale Molecular Dynamics (MD) studies on heterogeneous, model metal systems subjected to intense shock loading by a flyer plate were carried out. Of interest here is the effect of structural defects on interfacial strength under these extreme conditions. The metal target and flyer were essentially single crystals of Cu, but an interface layer was created by varying the mass of the Cu atoms in part of the sample. Interfacial defects in the form of vacancies, and at different concentrations, were introduced into the interfacial region. In addition to microstructural evolution of damage in this system, the shock induced temperature and pressure changes were also analyzed.

scholarly journals Numerical Simulation of Temperature and Pressure Changes due to Partial Discharges in Spherical Cavities Within Solid Dielectrics at Different Ageing Conditions

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4771 ◽  
Author(s):  
Johnatan M. Rodríguez-Serna ◽  
Ricardo Albarracín-Sánchez
Keyword(s):  
Dielectric Material ◽  
Surface Condition ◽  
Partial Discharges ◽  
Cavity Surface ◽  
Element Analysis ◽  
Finite Element Analysis Simulation ◽  
Insulation Systems ◽  
Temperature And Pressure ◽  
Solid Dielectrics ◽  
Pressure Changes

Partial Discharges (PD) behavior during ageing of the insulation systems exhibits variations that depend on changes in gas filling characteristics and surface condition. In this article, numerical simulations of temperature and pressure behavior in an air-filled spherical cavity within a homogenous solid dielectric material due to PD activity are presented. An Analytical-Finite Element Analysis simulation approach was implemented in MATLAB and results exhibit reasonable agreement with experimental measurements reported by other authors. Simulation results allow concluding that pressure changes are directly related to variations in the PD behavior. In addition, affectations to cavity surface due to temperature increments can be discarded.

Influence of the Reference State in the SLW Model for Flows With Strong Temperature and Pressure Gradients

2002 ◽  
Author(s):  
T. Badinand ◽  
T. H. Fransson
Keyword(s):  
Radiative Heat ◽  
Reference Temperature ◽  
Pressure Gradients ◽  
Absorption Coefficients ◽  
Local Conditions ◽  
High Temperature And Pressure ◽  
Small Influence ◽  
Temperature And Pressure ◽  
Reference Pressure ◽  
Pressure Changes

Radiative heat transfer in a real case showing high temperature and pressure gradients is calculated with a global model (SLW) with and without re-scaling of the absorption coefficients to the local conditions. Changes in radiative heat flux to the walls for different reference temperatures and reference pressures are studied. Changes in reference pressure are shown to have a small influence compared to changes in reference temperature, except if the pressure is less than 10 bars for a high-pressure case. The use of the scaling does decrease the dependency on the reference condition. The highest differences obtained with strong reference temperature or pressure changes (800K and 30.105 Pa) are of about 15% and 7% respectively. For smaller changes, an uncertainty of 5% could be assumed.

Sign in / Sign up

Export Citation Format

Share Document