Nucleate pool boiling with increased acceleration and subcooling
Thesis/Dissertation
·
OSTI ID:6593630
Measurements of the surface temperature are presented for pool boiling of distilled water in an accelerating system with various subcoolings and heat flux. The range of experimental variables include: heat flux between 60,000 and 477,000 Btu/h.ft/sup 2/, accelerations between 1 and 100 times standard gravitational acceleration, and liquid subcoolings between O and 160/sup 0/F. The test vessel was subjected to acceleration in a centrifuge such that the total acceleration vector was always perpendicular to the heating surface. The heating surface was a stainless steel foil 0.10-mm thick vacuum brazed to the end of a copper cylinder 25 mm in diameter. The heating surface temperature and heat flux were computed from measurements of temperature gradients in the copper cylinder. A heat exchanger submerged within the bulk test fluid provided the very large subcoolings obtained. At all levels of acceleration at constant heat flux, increasing the subcooling from saturated surface conditions caused the wall superheats to increase, and with further increase in subcooling caused the wall superheats to decrease. As the heat flux was increased to higher levels, the wall superheat increases upon subcooling became larger.
- Research Organization:
- Michigan Univ., Ann Arbor (USA)
- OSTI ID:
- 6593630
- Country of Publication:
- United States
- Language:
- English
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