Abstract
An experimental study was conducted on the critical heat flux (CHF) phenomenon on a single tube in an inline horizontal tube bundle that operates in an upward two-phase cross flow. For a saturated liquid, the CHF was 10–20% lower than the pool boiling value; there was no significant variation in the CHF with mass velocity. At low mass fluxes, the CHF generally decreased with increasing quality. At higher mass fluxes, the CHF first increased (sometimes quite sharply) with increasing quality, reached a maximum, and then began to decrease. At lower qualities, the CHF mechanism is most likely a departure from a nucleate boiling type process, and at higher qualities, a dryout phenomenon.
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