Measurement of axisymmetric temperature fields using reference beam and shearing interferometry for application to flames

2000 ◽  
Vol 29 (1) ◽  
pp. 1-12 ◽  
Author(s):  
A. Stella ◽  
G. Guj ◽  
S. Giammartini
Keyword(s):  
Reference Beam ◽  
Temperature Fields ◽  
Shearing Interferometry ◽  
Axisymmetric Temperature

Thermocapillary Motion of Bubbles Inside Drops

1981 ◽  
Vol 9 ◽  
Author(s):  
N. Shankar ◽  
Robert Cole ◽  
R. Shankar Subramanian
Keyword(s):  
Free Fall ◽  
Temperature Fields ◽  
Drop Surface ◽  
Thermocapillary Motion ◽  
Thermocapillary Migration ◽  
Axisymmetric Temperature

ABSTRACTThe quasi-static thermocapillary migration of a bubble located inside a drop in free fall is considered for arbitrary axisymmetric temperature fields prescribed on the drop surface. Some results are presented, and an approximation based on the superposition of simpler solutions is discussed.

ISO-Gradient Lines in a Differentially Heated Cylindrical Fluid Layer Using Coherent Gradient Sensing Interferometer

2002 ◽  
Author(s):  
D. Mishra ◽  
S. L. Wong ◽  
J. P. Longtin ◽  
R. P. Singh ◽  
V. Prasad
Keyword(s):  
Temperature Field ◽  
Reference Beam ◽  
Laser Interferometry ◽  
Temperature Fields ◽  
Line Of Sight ◽  
Water Medium ◽  
Gradient Sensing ◽  
Fluid Medium ◽  
Coherent Gradient Sensing ◽  
Convective Fluid

Non-invasive flow visualization and measurement of temperature fields in convective fluid systems continues to be a challenging problem for researchers. Radiation based measurements such as laser interferometry are one of the few available tool for this purpose. Laser interferometry allows for an accurate and convenient full field visualization and measurement of fluid properties. In the present study a single-beam Coherent Gradient Sensing (CGS) interferometer is used to obtain line-of-sight projections of a three-dimensional temperature field in a convective fluid medium. Due to its inherent insensitivity to vibrations, simple and cost effective optical layout and, most importantly, the absence of a separate reference beam, this interferometer is an ideal choice for measurements in convective fluids. In the present study, line-of-sight interferometric projections of a differentially heated water medium in a cylindrical cavity are presented. The cavity employed has an aspect ratio (diameter/height) of 3.9. The interferograms represent contours of gradient in the temperature field. Each of the interferograms is evaluated to obtain the two-dimensional projection of the temperature field. The temperature field obtained shows the absence of a radial-symmetric pattern at a Rayleigh number of 1.6×105.

On the Thermal Stresses Generated in Cylindrical Shells With Application to Gas Turbine Combustors

1982 ◽  
Author(s):  
H. A. Nied
Keyword(s):  
Gas Turbine ◽  
Thermal Stresses ◽  
Longitudinal Direction ◽  
Temperature Fields ◽  
Shear Stresses ◽  
Gas Turbine Combustor ◽  
Closed Form Solutions ◽  
Bending Stresses ◽  
Cooling Hole ◽  
Axisymmetric Temperature

The thermal stresses generated in a cylindrical shell due to axisymmetric temperature fields, which vary in the longitudinal direction, are examined by using an influence function formulation. Closed form solutions for the longitudinal, hoop and shear stresses are derived for any axially varying temperature distribution expressible by a Fourier expansion. The thermal stresses generated in a typical cylindrical gas turbine combustor cooled by periodically spaced circumferential bands of cooling holes are investigated using the derived solutions. It is shown that a critical pitch in the cooling hole spacing can create high bending stresses at the cooling holes which could contribute to thermal fatigue failure.

The growth of mica polytypes as studied by conventional and high-resolution TEM

1983 ◽  
Vol 41 ◽  
pp. 174-177
Author(s):  
A. Baronnet ◽  
M. Amouric
Keyword(s):  
Water Pressure ◽  
Point Of View ◽  
Temperature Fields ◽  
Natural Occurrence ◽  
Growth Mechanisms ◽  
Long Period ◽  
High Resolution Tem ◽  
Layer Stacking ◽  
Experimental Works ◽  
Potential Use

The origin of mica polytypes has long been a challenging problem for crystal- lographers, mineralogists and petrologists. From the petrological point of view, interest in this field arose from the potential use of layer stacking data to furnish further informations about equilibrium and/or kinetic conditions prevailing during the crystallization of the widespread mica-bearing rocks. From the compilation of previous experimental works dealing with the occurrence domains of the various mica "polymorphs" (1Mr, 1M, 2M1, 2M2 and 3T) within water-pressure vs temperature fields, it became clear that most of these modifications should be considered as metastable for a fixed mica species. Furthermore, the natural occurrence of long-period (or complex) polytypes could not be accounted for by phase considerations. This highlighted the need of a more detailed kinetic approach of the problem and, in particular, of the role growth mechanisms of basal faces could play in this crystallographic phenomenon.

Laser transmission welding with part adapted temperature fields

2012 ◽  
Author(s):  
Martin Devrient ◽  
Verena Wippo ◽  
Peter Jaeschke ◽  
Uwe Stute ◽  
Thomas Frick ◽  
...  
Keyword(s):  
Temperature Fields ◽  
Laser Transmission Welding
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