Heat transfer measurements and high resolution absolute temperature mapping in diode-end-pumped Yb:YAG

2004 ◽  
Author(s):  
Sébastien Forget ◽  
Sébastien Chénais ◽  
Frédéric Druon ◽  
François Balembois ◽  
Patrick Georges
Keyword(s):  
Heat Transfer ◽  
High Resolution ◽  
Absolute Temperature ◽  
Temperature Mapping

scholarly journals Direct and absolute temperature mapping and heat transfer measurements in diode-end-pumped Yb:YAG

2004 ◽  
Vol 79 (2) ◽  
pp. 221-224 ◽  
Author(s):  
S. Chénais ◽  
S. Forget ◽  
F. Druon ◽  
F. Balembois ◽  
P. Georges
Keyword(s):  
Heat Transfer ◽  
Absolute Temperature ◽  
Temperature Mapping

High-resolution absolute temperature mapping of laser crystals in diode-end-pumped configuration

2005 ◽  
Author(s):  
Julien Didierjean ◽  
Sebastien Forget ◽  
Sebastien Chenais ◽  
Frederic Druon ◽  
Francois Balembois ◽  
...  
Keyword(s):  
High Resolution ◽  
Absolute Temperature ◽  
Temperature Mapping ◽  
Laser Crystals

A new high resolution absolute temperature grid for the Greater Alpine Region back to 1780

2012 ◽  
Vol 33 (9) ◽  
pp. 2129-2141 ◽  
Author(s):  
Barbara Chimani ◽  
Christoph Matulla ◽  
Reinhard Böhm ◽  
Michael Hofstätter
Keyword(s):  
High Resolution ◽  
Absolute Temperature ◽  
Alpine Region

High Resolution Heat Transfer Measurements on the Stator Endwall of an Axial Turbine

2014 ◽  
Vol 137 (4) ◽  
Author(s):  
Benoit Laveau ◽  
Reza S. Abhari ◽  
Michael E. Crawford ◽  
Ewald Lutum
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
High Resolution ◽  
Surface Temperature ◽  
Transfer Coefficient ◽  
Mass Flow ◽  
Wall Temperature ◽  
Adiabatic Wall ◽  
Axial Turbine ◽  
The Heat Transfer Coefficient

In order to continue increasing the efficiency of gas turbines, an important effort is made on the thermal management of the turbine stage. In particular, understanding and accurately estimating the thermal loads in a vane passage is of primary interest to engine designers looking to optimize the cooling requirements and ensure the integrity of the components. This paper focuses on the measurement of endwall heat transfer in a vane passage with a three-dimensional (3D) airfoil shape and cylindrical endwalls. It also presents a comparison with predictions performed using an in-house developed Reynolds-Averaged Navier–Stokes (RANS) solver featuring a specific treatment of the numerical smoothing using a flow adaptive scheme. The measurements have been performed in a steady state axial turbine facility on a novel platform developed for heat transfer measurements and integrated to the nozzle guide vane (NGV) row of the turbine. A quasi-isothermal boundary condition is used to obtain both the heat transfer coefficient and the adiabatic wall temperature within a single measurement day. The surface temperature is measured using infrared thermography through small view ports. The infrared camera is mounted on a robot arm with six degrees of freedom to provide high resolution surface temperature and a full coverage of the vane passage. The paper presents results from experiments with two different flow conditions obtained by varying the mass flow through the turbine: measurements at the design point (ReCax=7.2×105) and at a reduced mass flow rate (ReCax=5.2×105). The heat transfer quantities, namely the heat transfer coefficient and the adiabatic wall temperature, are derived from measurements at 14 different isothermal temperatures. The experimental data are supplemented with numerical predictions that are deduced from a set of adiabatic and diabatic simulations. In addition, the predicted flow field in the passage is used to highlight the link between the heat transfer patterns measured and the vortical structures present in the passage.

High-resolution mirror temperature mapping in GaN-based diode lasers by thermoreflectance spectroscopy

2017 ◽  
Vol 56 (2) ◽  
pp. 020302 ◽  
Author(s):  
Dorota Pierścińska ◽  
Łucja Marona ◽  
Kamil Pierściński ◽  
Przemysław Wiśniewski ◽  
Piotr Perlin ◽  
...  
Keyword(s):  
High Resolution ◽  
Diode Lasers ◽  
Temperature Mapping
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