Transient Flow Field Temperature Profile Measurement Using Rotational Raman Spectroscopy

1974 ◽  
pp. 171-178 ◽  
Author(s):  
J. R. Smith
Keyword(s):  
Raman Spectroscopy ◽  
Flow Field ◽  
Temperature Profile ◽  
Transient Flow ◽  
Profile Measurement ◽  
Field Temperature

Temperature Profile Measurement and Failure Characterization of ESD Protection Devices Using Spectroscopic Photon Emission Microscopy and Raman Spectroscopy

1999 ◽  
Author(s):  
Mahmoud Rasras ◽  
Ingrid De Wolf ◽  
Guido Groeseneken ◽  
Jian Chen ◽  
Karlheinz Bock ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Temperature Profile ◽  
Impact Ionization ◽  
Light Emission ◽  
Photon Emission ◽  
Profile Measurement ◽  
Esd Protection ◽  
Protection Devices ◽  
Emission Microscopy ◽  
Failure Site

Abstract In this paper, Photon Emission Microscopy (PEM) and micro-Raman Spectroscopy (μRS) are applied for temperature profile measurements and failure characterization in gg-nMOS ESD protection devices. The measurements were carried out in avalanche and snapback biasing conditions. A correlation between the temperature profile obtained by μRS and the light emission location, measured by PEM, is observed for non-degraded devices. In addition, ESD-degraded devices were studied. PEM, μRS, Spectroscopic Photon Emission Microscopy (SPEM) and electrical measurements were used to investigate the origin of the light emitted at the failure site. They showed that the light emission occurring at the failure site is due to impact ionization.

A new dynamic mesh algorithm for studying the 3D transient flow field of tilting pad journal bearings

2016 ◽  
Vol 230 (12) ◽  
pp. 1470-1482 ◽  
Author(s):  
Mengxuan Li ◽  
Chaohua Gu ◽  
Xiaohong Pan ◽  
Shuiying Zheng ◽  
Qiang Li
Keyword(s):  
Flow Field ◽  
Equilibrium Position ◽  
Transient Flow ◽  
Journal Bearings ◽  
Dynamic Mesh ◽  
Static Equilibrium ◽  
Time Step ◽  
Tilting Pad ◽  
Grid Nodes ◽  
Tilting Pad Journal Bearings

A new dynamic mesh algorithm is developed in this paper to realize the three-dimensional (3D) computational fluid dynamics (CFD) method for studying the small clearance transient flow field of tilting pad journal bearings (TPJBs). It is based on a structured grid, ensuring that the total number and the topology relationship of the grid nodes remain unchanged during the dynamic mesh updating process. The displacements of the grid nodes can be precisely recalculated at every time step. The updated mesh maintains high quality and is suitable for transient calculation of large journal displacement in FLUENT. The calculation results, such as the static equilibrium position and the dynamic characteristic coefficients, are consistent with the two-dimensional (2D) solution of the Reynolds equation. Furthermore, in the process of transient analysis, under conditions in which the journal is away from the static equilibrium position, evident differences appear between linearized and transient oil film forces, indicating that the nonlinear transient calculation is more suitable for studying the rotor-bearing system.

Measurement Of Transient Flow Field Phenomena With A Digital Heterodyne Interferometer

1988 ◽  
Author(s):  
D. M. Swain ◽  
M. T. Jacoby ◽  
J. D. Tomassian
Keyword(s):  
Flow Field ◽  
Transient Flow ◽  
Heterodyne Interferometer

Research of transient flow field real time interferogram acquisition system

2007 ◽  
Author(s):  
Jiao Liang ◽  
Yongying Yang ◽  
Dong Liu ◽  
Yongmo Zhuo ◽  
Jianhua Hui ◽  
...  
Keyword(s):  
Flow Field ◽  
Real Time ◽  
Transient Flow ◽  
Acquisition System

scholarly journals Role of Transient Characteristics in Fish Trajectory Modeling

2020 ◽  
Author(s):  
zhu gao ◽  
zu hao zhou ◽  
Helge I Andersson
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Turbulent Flow ◽  
Transient Flow ◽  
Simultaneous Recording ◽  
Fish Locomotion ◽  
Vertical Slot ◽  
Turbulent Flow Structure ◽  
General Method

In this paper, we analyzed the live fish trajectory recorded from an experiment in an experimental vertical slot fishway. Combined with a numerical simulation, we demonstrated that randomness shown in fish trajectory might not merely be attributed to fish's random choices in its swimming, also could be an adaption consequence to the bulk unsteady turbulent flow structure. Simple superposing the fish trajectory on the time-averaged flow field obtained either by interpolating on discrete point measurements or numerical simulation is not an ideal method for fish movement description in fishway engineering. How to model the fish paths in transient flow and the necessity of simultaneous recording of the flow field and the fish locomotion are challenging topics. The suggested spectrum analysis of the flow field may provide a new general method to reproduce the fish trajectory in a complex turbulent flow.

Temperature profile measurement of graphite material using a CO2laser

2010 ◽  
Vol 82 (5) ◽  
pp. 055402 ◽  
Author(s):  
Payal Mehta ◽  
Arun Sarma ◽  
Joydeep Ghosh ◽  
Shwetang Pandya ◽  
Santosh Pandya ◽  
...  
Keyword(s):  
Temperature Profile ◽  
Profile Measurement ◽  
Graphite Material
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