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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

CRITICAL HEAT FLUX ENHANCEMENT FOR SATURATED POOL BOILING ON DOWNWARD-FACING STRUCTURED SURFACES

Get access (open in a dialog) DOI: 10.1615/IHTC16.bae.020788
pages 607-614

摘要

Since the Three Mile Island accident, researchers have found that a pressure vessel immersed in coolant can provide sufficient heat transfer to obtain in-vessel retention of a core melt. Saturated pool boiling from downward facing structured surfaces were measured in saturated deionized water to study the effects of orientation and structures on critical heat flux (CHF). The orientations were 5°, 30°, 45°, 60° and 90° (vertical), plain surface and kinds of structured surfaces (including grooved surface, interconnected-grooves surface with cavities, pin fin surfaces) were investigated. The results indicated that the CHF on downward facing surfaces increases with the orientation. The CHF on plain surface was equal to 1094.3 kW/m2 for the orientation of 90°. The CHF on grooved surface is more than 65% greater than the plain surface, the CHF increase varies with increasing orientation, with the CHF increases between 65% and 90%. Compared with plain surface, more than 102% CHF increase was obtained on interconnected- grooves surface with cavities. The CHF on pin fin surface is more than 202% greater than plain surface. Phenomenological characteristics regarding the bubble dynamic on the structured surfaces were illustrated at different heat fluxes.