Hydrodynamic behaviors of the falling film flow on a horizontal tube and construction of new film thickness correlation

摘要: Abstract The laminar liquid film falling on a horizontal smooth tube is studied numerically. instantaneous hydrodynamic characteristics of flow, the importance surface tension in calculation and effects flow rate, diameter, distributor height inlet temperature field thickness are elucidated. results indicate that: (1) important calculations tube; (2) circular has obvious behaviors; (3) increases with increase while decreases temperature, respectively; (4) distribution along peripheral angle unsymmetrical, minimum appears 110–150° depending working conditions. Furthermore, new correlations based present data established, which fit 97% 84 θ = 2–15° within ±20%, 90% 632 θ = 15–165° 73% 112 θ = 165–178° ±30%.