Time Variation of Nucleate Boiling Heat Transfer of Water

概要

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Boiling heat transfer is greatly affected by ease of bubble formation conditioned by surface quality and contamination of the heating surface. This tendency is represented quantitatively as the proportionality constant ζ=αR/Δθ^2 where α=coefficient of heat transfer, R=radius of heating surface and Δθ=temperature difference between heating surface and boiling liquid. ζ decreases with time from the initial value ζ_0 to the final value ζ_∞ corresponding to the steady state of boiling. This process can be written ζ/ζ_∞=1+{(ζ_0-ζ_∞)/ζ_∞}e^<-kt>, k=1.5 1/h It is shown that k is independent of the applied heat flux, surface quality of the heating surface and presence of solute, unless it deposits scale on the heating surface. The cause of the variation of ζ is desorption of adsorbed gas during exposure of the freshly polished heating surface to the atmosphere.
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