An experiment has been conducted to investigate transient radial heat transport effects created by oscillatory flow in uniformly heated tubes. Departures from one-dimensional, quasi-steady-state behavior have been quantified in the frequency range of density-wave oscillations. The data show a substantial radial dependence of both the amplitude and the phase of the liquid temperature perturbations even at frequencies as low as 0.1 Hz. The orderly axial enthalpy perturbation propagation breaks down at frequencies above 0.5 Hz. These effects must be taken into consideration in predicting the behavior of the point of net vapor generation in a boiling channel under oscillatory flow conditions.

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