The Temperature Distribution in the High Pressure Mercury Discharge Tube

1939 ◽  
Vol 55 (3) ◽  
pp. 294-296 ◽  
Author(s):  
W. Elenbaas
Keyword(s):  
High Pressure ◽  
Temperature Distribution ◽  
Discharge Tube

A cylindrical furnace with homogeneous temperature distribution for use in a cubic high‐pressure press

1990 ◽  
Vol 61 (2) ◽  
pp. 830-833 ◽  
Author(s):  
Yasushi Kawashima ◽  
Yoshihiko Tsuchida ◽  
Wataru Utsumi ◽  
Takehiko Yagi
Keyword(s):  
High Pressure ◽  
Temperature Distribution ◽  
Cylindrical Furnace ◽  
Homogeneous Temperature

scholarly journals Thermal Modeling of Tool Temperature Distribution during High Pressure Coolant Assisted Turning of Inconel 718

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 408 ◽  
Author(s):  
Doriana D'Addona ◽  
Sunil Raykar
Keyword(s):  
High Pressure ◽  
Temperature Distribution ◽  
Inconel 718 ◽  
Tool Temperature ◽  
Machining Processes ◽  
Nickel Chromium ◽  
Work Material ◽  
Cutting Zone ◽  
Overall Performance ◽  
High Pressure Coolant

This paper presents a finite-element modeling (FEM) of tool temperature distribution during high pressure coolant assisted turning of Inconel 718, which belongs to the heat resistance superalloys of the Nickel-Chromium family. Machining trials were conducted under four machining conditions: dry, conventional wet machining, high pressure coolant at 50 bar, and high pressure coolant at 80 bar. Temperature during machining plays a very important role in the overall performance of machining processes. Since in the current investigation a high pressure coolant jet was supplied in the cutting zone between tool and work material, it was a very difficult task to measure the tool temperature correctly. Thus, FEM was used as a modeling tool to predict tool temperature. The results of the modeling showed that the temperature was considerably influenced by coolant pressure: the high pressure jet was able to penetrate into the interface between tool and work material, thus providing both an efficient cooling and effective lubricating action.

scholarly journals Spektroskopische Messung der radialen Temperaturverteilung in Quecksilber-Hochdrucklampen mit Metallhalogenzusätzen / Spectroscopic Measurement of Radial Temperature Distribution in High-Pressure Mercury Lamps with Metal Halide Additives

1976 ◽  
Vol 31 (2) ◽  
pp. 196-200 ◽  
Author(s):  
H. Albrecht ◽  
A. Schiff
Keyword(s):  
High Pressure ◽  
Temperature Distribution ◽  
Spectroscopic Measurement ◽  
Signal Averaging ◽  
Radial Temperature ◽  
Radial Temperature Distribution ◽  
Pressure Discharge ◽  
High Incidence ◽  
Definite Time ◽  
Absorption Measurements

Abstract The radial temperature distribution in a Hg-high-pressure discharge with metal halogene additives (Sn-, Zn-Iodide) has been measured. Three different spectroscopic methods (Emission-, Absorption-, Bartels-and 2-lines-Method) are compared. The influence of the silica bulb is discussed. High incidence angles for the absorption measurements are realized by use of an elliptic mirror. Emission and absorption measurements in a definite time intervall of the 50 Hz-discharge current was done with signal averaging technique. The arc shows a constriction which is discussed.

The Use of CFD for the Thermal Analysis of a High Pressure Compressor Rotor

2004 ◽  
Author(s):  
U. W. Ruedel ◽  
J. R. Turner
Keyword(s):  
Thermal Analysis ◽  
High Pressure ◽  
Temperature Distribution ◽  
Flow Field ◽  
Transient Temperature ◽  
Temperature Profiles ◽  
Cfd Analysis ◽  
Compressor Rotor ◽  
High Pressure Compressor ◽  
Pressure Compressor

The prediction of fatigue life of components inside aircraft engines depends on the reliable numerical modelling of the temperature distribution during a mission cycle as this gives rise to life limiting thermal stresses. The transient temperature distribution is usually measured during an engine test and is then used to validate the numerical model, which in turn produces the basis for calculating the thermal stress levels. This paper describes the thermal analysis of a High Pressure Compressor Rotor (HPCR) and how the use of a 3-D Computational Fluid Dynamic (CFD) analysis improved the quantitative agreement between the measured and the predicted temperature profiles. The highly complex three-dimensional flow field within the compressor rotor was modelled by exploiting symmetry conditions and using a standard k-ε turbulence model. Results of the tangential, axial and radial velocity components as well as locations of peaks in turbulence kinetic energy were predicted to help identify the flow field inside the forward cavity of the rotor. Two ways of predicting internal re-circulating rates to the rim area are proposed. Finally, plots of predicted metal temperature profiles before and after the CFD-analysis are presented.

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