Developments in Instrumentation and Processing for Transient Heat Transfer Measurement in a Full-Stage Model Turbine

1989 ◽  
Vol 111 (1) ◽  
pp. 20-27 ◽  
Author(s):  
R. W. Ainsworth ◽  
J. L. Allen ◽  
M. R. D. Davies ◽  
J. E. Doorly ◽  
C. J. P. Forth ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Measurement Techniques ◽  
Three Dimensional ◽  
Transient Heat Transfer ◽  
Stage Model ◽  
Two Dimensional ◽  
Turbine Stage ◽  
Transfer Measurement ◽  
Unsteady Effects ◽  
Heat Transfer Measurement

Transient heat transfer measurement techniques have long been used in two-dimensional stationary cascade tests designed to model turbine conditions used in Oxford. More recently, experiments studying some of the unsteady effects have been carried out using a rotating wake generator upstream of the rotor cascade. Currently work has concentrated on providing a fully three-dimensional rotating turbine stage. In an associated paper, the modifications necessary to accommodate this stage in the Oxford Isentropic Light Piston Tunnel are discussed. In this paper the developments necessary to permit the measurement of transient heat transfer under these rotating conditions are fully described.

scholarly journals Optimization of Transient Heat Transfer Measurements Using Thermochromic Liquid Crystals Based on an Error Estimation

1996 ◽  
Author(s):  
Rainer Höcker
Keyword(s):  
Heat Transfer ◽  
Liquid Crystals ◽  
Measurement Techniques ◽  
Analytical Investigation ◽  
Transient Heat Transfer ◽  
Critical Parameters ◽  
Transfer Experiment ◽  
Transfer Measurement ◽  
Thermochromic Liquid Crystals ◽  
The Individual

An analytical investigation has been made to identify and quantify critical parameters influencing the final result of a transient heat transfer experiment. The aim was to obtain a set of dimensionless parameters, that describe the interaction of the individual measured quantities in a compact form. Among the wide variety of different kinds of heat transfer measurement techniques, the transient method, employing thermochromic liquid crystals, is very useful. It gives much detailed heat transfer information with a minimum effort in experimental time. The present paper focuses on this technique, although it is not the only choice for all kinds of applications, but it is the currently most frequently used one. This paper provides the means to lay out an experiment, so that it yields acceptable results with respect to the constraints for a set of test boundary conditions.

Thin-Film Heat-Flux Microsensor for Heat-Transfer Measurement in Micro-Heat Exchangers/Microreactors

2012 ◽  
Author(s):  
Houssein Ammar ◽  
David Hamadi ◽  
Bertrand Garnier ◽  
Ahmed Ould El Moctar ◽  
Hassan Peerhossaini ◽  
...  
Keyword(s):  
Thin Film ◽  
Heat Transfer ◽  
Heat Flux ◽  
Heat Exchangers ◽  
Measurement Techniques ◽  
Heat Transfer Analysis ◽  
Heat Flux Sensor ◽  
Transfer Measurement ◽  
Heat Transfer Measurement ◽  
Flux Sensor

Heat-transfer analysis in microfluidic devices is of great importance in applications such as micro-heat exchangers and microreactors. This work reports on improvements in temperature measurement techniques, which can be the source of large errors due to their intrusiveness and the unreliability of conventional thermal sensors. Gold thin films were deposited on a borosilicate substrate to realize a 2D heat flux sensor for heat-transfer measurement along the main flow within microchannels. Two applications are shown, one related to micro-heat exchangers and the other to microreactors. For the micro-heat exchanger, the effect of length scale on heat transfer in a straight microchannel was investigated and the validity of macroscale correlations for convective heat transfer was checked for deionized water flowing in microchannels of heights 12 to 52 μm. For the microreactor, the reaction enthalpy of an acid–base reaction measured using the new heat-flux sensor had only a 5% discrepancy from the standard value, showing the efficiency of the new thin-film device.

Correction for 3D Conduction Effect in the Transient Heat Transfer Measurement

2018 ◽  
Vol 21 (3) ◽  
pp. 15-21
Author(s):  
Jin Young Jeong ◽  
Young Jun Kang ◽  
Jung Shin Park ◽  
Jae Su Kwak
Keyword(s):  
Heat Transfer ◽  
Transient Heat Transfer ◽  
Transfer Measurement ◽  
Heat Transfer Measurement
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