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Experimental verification of the theoretical model of the thermal detector of flow reversal |
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Experimental verification of the theoretical model of the thermal detector of flow reversal Autor: J. Kiełbasa
The paper presents the reasoning leading to experimental verification of the theory describing the operation of a sensor used for flow reversal detection. The sensor is consists of two hot, parallel wires at a lose distance so they can interact with one another. They lie one behind the other, on the plane parallel to flow velocity. The wires are normal to the velocity vector. The distinctive feature of this sensor is that the two wires, connected in series, are supplied from one CTA system, which means that the sum of wires' resistance is maintained on a preset, constant level. Voltage difference across the wires is the measured parameter. Theoretical considerations presented in the work of [Gawor et al., 1999] and [Kiełbasa, 2000a] yield the formula (1) providing the relationship between the difference in wire temperatures and sensor geometry and physical parameters of the flowing medium. The problem is that the researcher does not directly measure the temperature of hot wires but the voltages across the wires when surrounded by the flowing medium. The relationships are based on thus measured voltages and the conditions of constant-temperature principle of operation.
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2011