Influence of oval-shaped tube on falling film flow characteristics on horizontal tube bundle

Luo, Lincong; Zhang, Guanmin; Pan, Jihong; Tian, Mei

doi:10.1080/19443994.2014.904820

Cited by 8 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The random character of the falling film requires instantaneous film thickness measurements and statistical examination of the data. Several studies of film flow on horizontal tubes have been performed [20,[28][29][30][31][32][33][34][35]. The film flow on horizontal tubes has mainly been investigated for sheet and jet regions.…”

Section: Introductionmentioning

confidence: 99%

Effects of Film Flow and a Surfactant on Scale Formation in Falling Film Evaporators for Seawater Desalination

Waack

Glade

Nied

2021

Heat Transfer Engineering

View full text Add to dashboard Cite

Horizontal tube falling film evaporators are commonly used in multiple-effect distillation (MED) plants for seawater desalination. Scale formation on the evaporator tubes strongly depends on film flow characteristics. The thickness of the liquid film on a horizontal tube was measured in a test rig with a high-resolution optical micrometer. Furthermore, scale formation was studied with artificial seawater in a horizontal tube falling film evaporator at pilot plant scale. The effects of a polyoxyalkylene triblock copolymer surfactant on falling film flow and scale formation were investigated at different wetting rates. Film thicknesses on the bottom of the tube exceed film thicknesses on the top by an order of magnitude. The thinnest film is formed on the tube sides. The mean film thickness increases with increasing wetting rate. The scale formation on the top of the tube is stronger than that at the bottom. The highest scale thickness was measured at the tube sides. Scale mass and scale layer thickness increase with decreasing wetting rate. As the minimum and the mean film thickness increase and surface waves are mostly damped in presence of the surfactant, the mass transfer resistance is higher and, thus, scale formation is reduced.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Film Flow and a Surfactant on Scale Formation in Falling Film Evaporators for Seawater Desalination

Waack

Glade

Nied

2021

Heat Transfer Engineering

View full text Add to dashboard Cite

show abstract

“…These parameters appear in an equation with respect to the exponential function of the Reynolds number and the Galileo number that can be used to judge the change in the flow pattern. Some researchers have also studied the roughness of flat plates and round tubes, noncircular pipes (oval, moon-shaped), , and walls with complex transverse structures such as plates with rectangular holes, which not only cause fluctuations in falling film flow but also improve fluid dispersion and mixing. Additionally, Wang et al observed that the existence of the coated region on tubes enhanced the fluctuation of the liquid film and contributed to the enhancement of mass and heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Verification of the Film-Forming Behavior of Falling Film Flow Down Clamped Channels with High-Viscosity Fluid

Wang

Chen

Lin

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The film-forming behavior of falling film flow with a high-viscosity fluid in clamped channels was investigated numerically and experimentally. The present work puts forward and deeply investigates a new method of falling film flow in the field of industrial engineering. The new findings from computational fluid dynamics (CFD) agree well with the experimental results. Flow patterns can be observed and divided into three flow patterns: columnar flow, partial curtain flow, and curtain flow. In terms of different flow patterns, the evolution of the liquid film along the direction of gravity was diversified, mainly including coalescence, break-up, shrinkage, and expansion. In addition, the shape of the free surface depended mainly on the physical properties of the fluid, the geometrical structure of the channel, and the spray density. The convex ratio k of the liquid film varied between 0 and 1.2, and such a wide range indicated that the free surface of the liquid film would be visually bent, resulting in a large area for the gas–liquid interface and a very high level of the film-forming efficiency. More interestingly, the desired shape of the liquid film was obtained by regulating the structural factors r and d. Based on the above conclusions, the method concerning falling film flow down clamped channels could be beneficial to enhance the heat and mass transfer in the process intensification of industrial engineering.

show abstract

Flow behavior of liquid falling film on a horizontal corrugated tube

Zhang

Wang

et al. 2020

Annals of Nuclear Energy

View full text Add to dashboard Cite

Influence of oval-shaped tube on falling film flow characteristics on horizontal tube bundle

Cited by 8 publications

References 16 publications

Effects of Film Flow and a Surfactant on Scale Formation in Falling Film Evaporators for Seawater Desalination

Effects of Film Flow and a Surfactant on Scale Formation in Falling Film Evaporators for Seawater Desalination

Numerical Simulation and Experimental Verification of the Film-Forming Behavior of Falling Film Flow Down Clamped Channels with High-Viscosity Fluid

Flow behavior of liquid falling film on a horizontal corrugated tube

Contact Info

Product

Resources

About