Heat Transfer Measurements with Surface Mounted Foil-Sensors in an Active Mode: A Comprehensive Review and a New DesignReportar como inadecuado




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Hamburg University of Technology, Institute of Thermo-Fluid Dynamics, Denickestr. 17, D 21073 Hamburg, Germany





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Abstract A comprehensive review of film-sensors shows that they are primarily operated in a passive mode, i.e. without being actively heated to an extent, whereby they create a heat transfer situation on their own. Only when these sensors are used for wall shear stress measurements, the detection of laminar-turbulent transition, or the measurement of certain flow velocities, they are operated in an active mode, i.e. heated by an electrical current after an appropriate calibration. In our study we demonstrate how these RT-based sensors temperature dependence of the electrical resistance R can also be applied in an active mode for heat transfer measurements. These measurements can be made on cold, unheated bodies, provided certain requirements with respect to the flow field are fulfilled. Our new sensors are laminated nickel- and polyimide-foils manufactured with a special technology, which is also described in detail. View Full-Text

Keywords: Double Foil Sensor; Active Mode; Passive Mode; Calibration Procedures; Convective Heat Transfer Double Foil Sensor; Active Mode; Passive Mode; Calibration Procedures; Convective Heat Transfer





Autor: Horst Mocikat and Heinz Herwig *

Fuente: http://mdpi.com/



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