Although measurements in nonisothermal flows have been made with constant current hot wire anemometers, the signals obtained are not amenable to linearization and do not permit continuous and simultaneous measurements of velocity and temperature. The instrument described here, consisting of two hot wire probes operated in different modes provides separate and simultaneous signals directly proportional to velocity and temperature for the frequency range of interest (0–10 kHz). This instrument was tested in a controlled environment and the results proved very satisfactory.
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Chevray et al. (1972) studied this question.
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