Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7053721 | International Journal of Heat and Mass Transfer | 2018 | 15 Pages |
Abstract
Heat transfer and pressure drop for two-phase flow are closely related to corresponding flow patterns. In this work, an experimental investigation on adiabatic and condensation two-phase flow patterns and their transitions of tetrafluoromethane (R14) in a horizontal tube with inner diameter of 4â¯mm was conducted. Experiments were implemented at mass fluxes from 200 to 650â¯kg/(m2â¯s), saturation pressures from 1 to 3â¯MPa and heat fluxes from 8.2 to 28.2â¯kW/m2. The observed adiabatic flow patterns were compared with six well-known flow pattern maps, none of them can predict all the transition lines accurately. Therefore, a new dimensionless number S1, which takes account of inertia force, gravity force, shear force and surface tension force, was proposed to develop the new adiabatic flow pattern transition criteria. Eight groups of data were compared with the new adiabatic flow pattern map, most of the flow pattern data can be accurately predicted. What's more, in order to explain the effect of heat flux on condensation flow pattern transitions, another new dimensionless number S2 was proposed by combining the dimensionless number S1 and boiling number together. Finally, a condensation flow pattern map was proposed based on the dimensionless number S2.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Qinglu Song, Gaofei Chen, Zhiqiang Yang, Haocheng Wang, Maoqiong Gong,