Transient Critical Heat Fluxes of Subcooled Water Flow Boiling in a SUS304-CIRCULAR Tube with Twisted-Tape Insert

Abstract

Abstract

Transient critical heat fluxes of subcooled water flow boiling in a SUS304-circular tube caused by a rapid decrease in velocity from non-boiling regime

“…The influences of twisted-tape insert, twist ratio, heating rate and swirl velocity on the transient CHF are investigated into details. And the power transient CHF correlations against inlet and outlet subcoolings for the test tubes with twisted-tape insert are derived due to the effect of boiling number based on swirl velocity, Bocr,sw, and Weber number based on swirl velocity, We sw [10][11][12][13].…”

“…First is to measure the transient critical heat fluxes for SUS304-circular tube with various decelerations caused by a rapid decrease in velocity () for the wide ranges of initial flow velocities (u0), initial heat fluxes (q0) and inlet subcoolings (Tsub,in). Second is to compare the above results with the power transient critical heat fluxes for SUS304-circular tubes with and without twisted-tape inserts caused by rapid increasing heat inputs [10][11][12][13][14][15][16][17][18] (PT-CHF). Third is to clarify the influence of initial flow velocity, initial heat flux, inlet subcooling and deceleration caused by a rapid decrease in velocity on the flow transient critical heat flux (FT-CHF).…”

Transient Critical Heat Fluxes of Subcooled Water Flow Boiling in a SUS304-Circular Tube Caused by a Rapid Decrease in Velocity From Non-Boiling Regime

“…The influences of twisted-tape insert, twist ratio, heating rate and swirl velocity on the transient CHF are investigated into details. And the power transient CHF correlations against inlet and outlet subcoolings for the test tubes with twisted-tape insert are derived due to the effect of boiling number based on swirl velocity, Bocr,sw, and Weber number based on swirl velocity, We sw [10][11][12][13]. The objectives of present study at a loss of flow accident for Fusion Reactor Safety (FRS) are fivefold.…”

“…First is to measure the transient critical heat fluxes for SUS304-circular tube with various decelerations caused by a rapid decrease in velocity () for the wide ranges of initial flow velocities (u0), initial heat fluxes (q0) and inlet subcoolings (Tsub,in). Second is to compare the above results with the power transient critical heat fluxes for SUS304-circular tubes with and without twisted-tape inserts caused by rapid increasing heat inputs [10][11][12][13][14][15][16][17][18] (PT-CHF). Third is to clarify the influence of initial flow velocity, initial heat flux, inlet subcooling and deceleration caused by a rapid decrease in velocity on the flow transient critical heat flux (FT-CHF).…”