Subcooled flow boiling in circumferentially nonuniform and uniform heated vertical channels with downward flow

Results are presented for new experimental data for subcooled flow boiling heat transfer in circumferentially nonuniforms (single-side) and uniformly heated tubes. Although the Liu-Winterton correlation had better agreement a t low power levels and axial locations. Shah's correlation had better agree ment at higher power levels and at axial locations near the center of the h eated length. Both correlations overpredicted the data near the exit. There fore, additional correlational developmental work is needed for local (axia l) flow boiling heat transfer in circumferentially nonuniform heated channe ls.