Experimental investigation of the chemical degradation of lubricating grease from an energy point of view

2019 ◽  
Vol 137 ◽  
pp. 289-302 ◽  
Author(s):  
Asghar Rezasoltani ◽  
M.M. Khonsari
Keyword(s):  
Experimental Investigation ◽  
Point Of View ◽  
Chemical Degradation ◽  
Lubricating Grease ◽  
Energy Point

Die intrinsische Systemreaktion des tribologisch beanspruchten Schmierfettes

2021 ◽  
Author(s):  
Erik Kuhn
Keyword(s):  
Driving Forces ◽  
Observation Point ◽  
Point Of View ◽  
Experimental Results ◽  
Research Paradigm ◽  
Lubricating Grease ◽  
New Research

This article deals with the observed reactions of a lubricating grease to tribological stress. An attempt is made to find the driving forces describe that are responsible for the intrinsic response. From these considerations, a new research paradigm is derived that leaves the traditional observation point of view. The investigations are illustrated with experimental results.

Experimental Investigation on Droplet Behavior in a Transonic Compressor Cascade

2014 ◽  
Vol 137 (3) ◽  
Author(s):  
Niklas Neupert ◽  
Birger Ober ◽  
Franz Joos
Keyword(s):  
Experimental Investigation ◽  
Gas Turbines ◽  
Surface Film ◽  
Flow Channel ◽  
Point Of View ◽  
Compressor Cascade ◽  
Two Phase ◽  
Transonic Compressor ◽  
Droplet Behavior ◽  
Industrial Gas Turbines

In recent years, overspray fogging has become a powerful means for power augmentation of industrial gas turbines (GT). Most of the studies concerning this topic focus on the problem from a thermodynamic point of view. Only a few studies, however, were undertaken to investigate the droplet behavior in the flow channel of a compressor. In this paper, results of experimental investigation of a water laden flow through a transonic compressor cascade are presented. A finely dispersed spray was used in the measurements (D10 < 10 μm). Results of the droplet behavior are shown in terms of shadowgraphy images and images of the blade surface film pattern. The angle of attack, the incoming velocity, and the water load were varied. The qualitative observations are related to laser Doppler and phase Doppler anemometer (LDA/PDA) data taken in the flow channel and at the outlet of the cascade. The data represent a base for numerical and mean line models of two-phase compressor flow.

scholarly journals II.—The Fundamental Problems of Petrogenesis, or the Origin of the Igneous Rocks

1911 ◽  
Vol 8 (6) ◽  
pp. 248-257 ◽  
Author(s):  
Franz Lœwinson-Lessing
Keyword(s):  
Physical Chemistry ◽  
Experimental Investigation ◽  
Fundamental Problem ◽  
Genetic Relationships ◽  
Point Of View ◽  
Igneous Rocks ◽  
Detailed Observation

The question of the origin of igneous rocks, their diversity and genetic relationships, represents that fundamental problem of petrography which has been for many years the object of inquiry for petrologists as well as for geologists and chemists. Whilst the amount and scope of detailed observation were growing, the methods of experimental investigation improved, and as the eruptive rocks came to be studied from the point of view of physical chemistry, so the petrogenetical horizon became larger and wider. Thus, on the basis of numerous minute and detailed observations were built broad generalizations that gave rise to new problems.

The Effect of Anisotropic Support on Rotor Instability Due to Fluid Leakage

1988 ◽  
Vol 110 (4) ◽  
pp. 585-591
Author(s):  
Jhy-Horng Wang ◽  
Ming-Te Tsai
Keyword(s):  
Point Of View ◽  
Simplified Model ◽  
Optimum Range ◽  
Energy Point ◽  
Fluid Leakage ◽  
Rotor Bearing ◽  
Anisotropic Stiffness ◽  
Bearing System

The instability caused by fluid leakage leads to limited performance in turbomachines. This instability may be improved by using flexible bearing supports with anisotropic stiffness. With a simplified model this effect is investigated, including the influence of many parameters. The results show that the optimum range of anistropy is strongly dependent on the parameters of the rotor-bearing system. In this paper an explanation from an energy point of view is presented to clarify the different stability behaviors with anisotropic bearing support.

Optimization of Ultra-Fine Limestone Filler on Cement Grain Composition

2013 ◽  
Vol 438-439 ◽  
pp. 94-97
Author(s):  
Wen Xu ◽  
Fei Guo ◽  
Qian Tian
Keyword(s):  
Experimental Investigation ◽  
Particle Size ◽  
Flow Resistance ◽  
Particle Distribution ◽  
Free Water ◽  
Point Of View ◽  
Cement Particle ◽  
Grain Composition ◽  
Replacement Ratio ◽  
Limestone Filler

An experimental investigation was carried out to evaluate the effect of limestone filler (LF) with equivalent replacement of cement on its grain composition. The results indicated that LF optimized cement particle distribution, filled the empty place among cement particles and released more free water when mixing. With the decrease of the LF particle size and the increase of LF replacement ratio of cement, these effects were more remarkable. As a result, the finer and the more replacement ratio of the microfiller, the lower the flow resistance and plastic viscosity of the mixture from a rheological point of view.

scholarly journals Photo-electrons and negative ions

1931 ◽  
Vol 134 (824) ◽  
pp. 427-444 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Experimental Investigation ◽  
Applied Field ◽  
Negative Ions ◽  
Point Of View ◽  
Electrons And Ions ◽  
Abnormal Increase ◽  
Normal Law

The normal law connecting the mobility ( k ) of a gas ion with the pressure ( p ) of the gas, is that the product pk is constant. More than 20 years ago Kovarik found that this product showed an abnormal increase in the case of the negative ions formed in air and carbon dioxide when the pressure was lowered below 20 cm. approximately; this result was interpreted as denoting a progressive diminution in the size and mass of the ion as the pressure is reduced. Some years later the author conducted an experimental investigation, from the results of which he concluded that at the lower pressures the carriers of negative electricity consist of two kinds, electrons and ions; the electrons come more and more into evidence as the pressure of the gas is reduced and travel freely under the influence of an applied field without becoming attached to molecules. From this point of view anomalous mobilities will be obtained at lower pressures unless the electrons are separated experimentally from the negative ions. The author found that, when this separation was effected, the mobility law, pk = const., remained valid down to the lowest pressure employed, viz., 0·15 mm.

A Determination of Contact-Loss at a Bearing of a Linkage Mechanism

1977 ◽  
Vol 99 (2) ◽  
pp. 375-379 ◽  
Author(s):  
C. L. S. Wu ◽  
S. W. E. Earles
Keyword(s):  
Experimental Investigation ◽  
Dynamic Response ◽  
Point Of View ◽  
Linkage Mechanism ◽  
Design Point ◽  
The Impact

A method is described for analyzing the kinematic and dynamic response of a linkage mechanism in which one bearing has a known clearance. Assuming the clearance to be represented by a massless link, the analysis predicts the occurrence of contact-loss. Part of an extensive experimental investigation is presented in which the impact accelerations resulting from contact-loss are measured. A good correlation is shown to exist between the predicted and measured times of contact-loss. Although the analysis may predict no contact-loss, it does not readily indicate, from a design point of view, how this condition could be produced.

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