Transient Pool Boiling of Liquid Nitrogen Due to a Square-Wave Heat Flux
The following study is based on pool boiling from a horizontal wire undergoing a periodic step in Joule heating (variable in amplitude and frequency) in saturated liquid nitrogen at atmospheric pressure. The principal area of investigation is the influence of heat-generation frequency upon the transient behavior of nucleate boiling, departure from nucleate boiling (DNB or “burnout”), and film boiling. The transient conditions are analyzed by determining the variation of the wire temperature with time for several power inputs over a frequency range of 0.1 to 1000 Hz. The results are compared with theoretical predictions and studies by other researchers.
KeywordsHeat Flux Test Section Power Input Rayleigh Number Joule Heating
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