Pressure drops for steam and water flow in heated tubes

Pressure drop analysis of steam condensation in air-cooled circular tube bundles

“…This is primarily due to a lack of condensing steam-water experimental data, which this study seeks to alleviate. Most of the data available in literature is either for adiabatic flows [20] or for evaporating flows [23,22,21]. The issue is compounded by the fact that the mass fluxes examined in literature are two -three orders of magnitude greater than those examined herein -which are representative of typical condensing flows in ACCs.…”

“…As such, a number of studies have been carried-out to ascertain the applicability of such correlations to particular conditions. Through comparison with pressure drop measurements, Idsinga et al [20] assessed the applicability of eighteen correlations for adiabatic steam-water flows at mass fluxes in the range of 270e4340 kg/m 2 s. Leung et al [21] presented measurements of steam-water flows in heated tubes spanning mass fluxes of 1000e10,000 kg/m 2 s and also compared their data, in terms of the two-phase multiplier. Ould Didi et al [22] examined pressure drop data for evaporation of refrigerants over mass fluxes of 100e500 kg/m 2 s and found that [19] and [17] compared best.…”

Subcooled and saturated water flow boiling pressure drop in small diameter helical coils at low pressure

“…(19) is based upon data for adiabatic two-components mixtures at low pressure. Since heating effects can significantly influence two-phase frictional pressure drop [32], the original equation of Lockhart and Martinelli is corrected according to Tarasova [31], Eq. (20).…”

Steady state boiling crisis in a helium vertically heated natural circulation loop – Part 2: Friction pressure drop lessening

“…In the case of water, the effect is not as pronounced as in our case, but still appreciable. Leung et al [5], report a drop of the two-phase multiplier from 2 to 1.5 with CHF on steam water systems. In the case of hydrogen, as reported by Graham and et al [6], the friction forces practically disappear.…”