Effects of structural parameters on water film properties of transpiring wall reactor

Reactor corrosion and salt deposition problems severely restrict the industrialization of supercritical water oxidation. Transpiring wall reactor can effectively weaken these two problems through a protective water film formed on its internal surface. In this work, the effects of key structural parameters on water film properties of transpiring wall reactor were explored by numerical simulation, and established models were validated by comparing simulation and experimental values. The results show that transpiration water layer, transpiring wall porosity and inner diameter hardly affected organic matter degradation. Increasing transpiration water layer and transpiring wall porosity reduced reactor center temperatures in the middle and lower zones of the reactor. Increasing transpiration water layer, transpiring wall porosity and inner diameter decreased water film temperatures but increased water film coverage rates. Increasing reactor length affected slightly on the volume of the upper supercritical oxidation zone but enlarged the subcritical zone.

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Investigation of water film properties on graphite surfaces

Materials Chemistry and Physics ◽

10.1016/0254-0584(85)90049-5 ◽

1985 ◽

Vol 12 (2) ◽

pp. 111-120 ◽

Cited By ~ 6

Author(s):

Piotr Staszczuk

Keyword(s):

Water Film ◽

Film Properties

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Numerical Calculation Analysis of Structural Parameters of Water-Lubricated Thrust Bearing

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.1666 ◽

2010 ◽

Vol 44-47 ◽

pp. 1666-1671 ◽

Cited By ~ 1

Author(s):

Lin Liu Zheng ◽

Zhu Xin Wu

Keyword(s):

Friction Coefficient ◽

Film Thickness ◽

Thrust Bearing ◽

Structural Parameters ◽

Water Film ◽

Film Pressure ◽

Water Film Thickness ◽

Coefficient Increase ◽

Maximum Water ◽

Thrust Pad

The affect of the thrust pad inclination and ratio of length to breadth (L/B) on the lubricity of a water-lubricated thrust bearing is studied in numerical method. The research results indicate that when the elastic deformation is considered, the distribution of both water film thickness and pressure presents to be paraboloid. With the increase of thrust pad inclination, both maximum water-film pressure and the friction coefficient increase, and the minimum water-film thickness decreases first and then increases; when the L/B increases in the range of 1~2, both maximum water-film pressure and the friction coefficient increase, but the minimum water-film thickness decreases.

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Investigations of water film properties on barite surface containing preadsorbed tetradecylammonium hydrochloride (TDACl)

Thermochimica Acta ◽

10.1016/0040-6031(87)87054-5 ◽

1987 ◽

Vol 122 (2) ◽

pp. 363-376 ◽

Cited By ~ 18

Author(s):

P. Staszczuk ◽

B. Biliński

Keyword(s):

Water Film ◽

Film Properties

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Dynamics of moisture interaction with polyelectrolyte multilayers containing nanofibrillated cellulose

Nordic Pulp & Paper Research Journal ◽

10.3183/npprj-2012-27-02-p496-499 ◽

2012 ◽

Vol 27 (2) ◽

pp. 496-499 ◽

Cited By ~ 4

Author(s):

Hjalmar Granberg ◽

Ludovic Gustafsson Coppel ◽

Mohamed Eita ◽

Eduardo Antunez de Mayolo ◽

Hans Arwin ◽

...

Keyword(s):

Colour Change ◽

Water Film ◽

Nanofibrillated Cellulose ◽

Layer By Layer ◽

Film Properties ◽

Spectral Ellipsometry ◽

Number Of Layers ◽

Layer Technique ◽

Added Water ◽

Lbl Films

Abstract Recent findings have shown that it is possible to use the Layer-by-Layer technique to create nanofibrillated cellulose / polyethyleneimine interference films whose colour change with relative humidity. This study uses different optical models to describe spectral ellipsometry measurements data of interference films and how the film properties alter in dry and humid environments. The results indicate that water condensation initially is filling the surface pores within seconds whereas relaxation of the film to adjust to the added water is a slower process that reaches a steady state after »20 min. The maximum swelling ratio of the LbL films is almost independent of the number of layers within the film, but decreases considerably by crosslinking via heat treatment. The films show a distinct birefringence with optical axis perpendicular to the surface. Analysis of the moisture response with different optical models indicates that the films swell uniformly in the thickness direction with no separate water film on top. The results provide important understanding for the design of NFC based LbL films for visual moisture sensors and interactive security paper.

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Model and Experiment on Resistance Loss of Wet Chordal Grid with Spray Pressure and Structural Parameters

Mathematical Problems in Engineering ◽

10.1155/2021/6682988 ◽

2021 ◽

Vol 2021 ◽

pp. 1-10

Author(s):

Hua Guo ◽

Haiqiao Wang ◽

Zhirong Wu

Keyword(s):

Wind Speed ◽

Structural Parameters ◽

Steel Wire ◽

Water Film ◽

Resistance Coefficient ◽

Dust Removal ◽

Filling Rate ◽

Wind Speeds ◽

Vibrating String ◽

Relationship Of

To reduce the dedusting resistance of wet vibrating string grille precipitators during dedusting in mine ventilation roadways, we investigated the dedusting resistance characteristics of water fog and water film coupling and determined the relationship between dedusting resistance and spray pressure, vibrating grid filling rate, and wind speed. A mathematical resistance coefficient model is established using hydrodynamics theory and capillary mechanics. The theoretical relationship of dedusting resistance is deduced. The results show that when wind speed is constant, the spray pressure and dedusting resistance are higher and the resistance is smaller with a high filling rate compared with a low filling rate. Constant spray pressure allows faster wind speeds and reverse pressure gradient forces to increase when dust flows around the wet vibrating wire, which makes the pressure distribution asymmetrical around the steel wire and increases resistance. Dust removal resistance of the resonance chord with a high filling rate is substantially lower than that with a low filling rate under the same working conditions. On the basis of satisfying the dedusting efficiency, the resonance chord dedusting system does not affect normal production and resistance is low. The spray pressure is controlled at 0.3–0.7 MPa and the optimal wind speed is 3–4 m/s. According to the theoretical calculation and experimental data, the optimal filling rate of a vibrating string grid plate is 77.8%, spray pressure is 0.7 MPa, and wind speed is 3.5 m/s. Dust removal with low resistance and improved economic benefit can thus be obtained.

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