Experimental Investigation of Discrete Heat Transfer Measurement Techniques for Tunnel A Applications

1981 ◽  
Author(s):  
G. Wannenwetsch
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Measurement Techniques ◽  
Transfer Measurement ◽  
Heat Transfer Measurement

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.

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.

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