高圧域における上向き面の飽和プール沸騰限界熱流束(熱工学,内燃機関,動力など)

概要

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Observation of boiling behavior and measurement of critical heat flux (CHF) were carried out for saturated water boiling on a horizontal, upward-facing plate at pressures from atmospheric to 7MPa. The heating surface was made of nichrom with 20μm in thickness, 4mm in width, and 27.5mm in length. The primary bubbles diminish in size approximately with the inverse of the pressure and commence to coalesce in the very low heat flux region to form coalesced bubbles. The detached coalesced bubbles continuously increase in size with increases in the heat flux and grow to about 10mm in equivalent diameter even at high pressure of 5MPa. Detachment frequency of the coalesced bubbles was insensitive to the heat flux and pressure. The CHF was predicted based on the macrolayer dryout model where an empirical correlation of detachment frequency derived in the present paper and a correlation of macrolayer thickness previously proposed by the author and a coworker were used. The predicted CHF agrees fairly well with the measured values.
2005-02-25