Abstract
A simplified 1-D model is developed to compute the response of a near-wall hot wire as subjected to a velocity perturbation and sine-wave voltage perturbation tests. The calculated frequency response, f D (according to the velocity perturbation test) and f bulge (according to the sine-wave perturbation test) are compared to previous experimental works, and to ascertain the relationship proposed by Teo et al. [Meas. Sci. Technol. 12 (2001) 37] between f D and f bulge. The behavioral trends of f D and f bulge are evaluated in terms of varying convection velocity, influence of wall effects and other pertinent factors. Although f D and f bulge share many similar characteristics and trends, the differences between the two responses give rise to the suggestion that while f D measures the response of heat lost from the wire in near-wall vicinity by velocity perturbation, f bulge measures the frequency response to the total heat lost from the wire.
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