Hydrogen Heat Transfer in the Presence of Thermal-Acoustic Oscillations
Thermal-acoustic oscillations are self-induced hydraulic oscillations which appear to be caused by a coupling between heat transfer, pressure, density, and low in a system in which the fluid undergoes a change of phase, or a process similar to it, in the presence of film boiling. The oscillations are periodic and occur at frequencies which can be related to acoustic frequencies. A system which generated thermal-acoustic oscillations is shown in Fig. 1. The application of an increasing amount of heat to this system when liquid hydrogen was flowing through it first produced quiescent low, then irregular fluctuations which resemble those associated with slug flow , then quiescent flow again, and finally thermal-acoustic oscillations when the flow in the outlet 3/4 of the test section was gaseous. Within a range of wall-to-bulk fluid temperature ratios of less than 9.5, increasing the rate’ of heat generation increased the amplitude of the oscillations.
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