Volatilization of hydrogen sulfide from a quiescent surface

2012 ◽  
Vol 66 (9) ◽  
pp. 1991-1996 ◽  
Author(s):  
Rita de Cassia Feroni ◽  
Jane Meri Santos ◽  
Neyval Costa Reis
Keyword(s):  
Mass Transfer ◽  
Hydrogen Sulfide ◽  
Aspect Ratio ◽  
Flow Field ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Schmidt Number ◽  
Numerical Study ◽  
Surface Velocity ◽  
Weak Wind

Air–water mass transfer of hydrogen sulfide from a shallow tank with a quiescent surface under the influence of weak wind stress on the water surface was studied numerically using a two-dimensional model. The flow field in the tank was investigated using a computational code based on a finite volume, which is used to numerically solve momentum, mass and continuity conservation equations. The results show that water phase flow field is strongly dependent on the wind-induced surface velocity and the aspect ratio of the tank. Based on the numerical study, the liquid-side mass transfer coefficient is correlated with Reynolds number (Re), tank aspect ratio (AR) and Schmidt number (Sc). Overall mass transfer coefficient (KL) values extend further downstream as the Re number increases.

scholarly journals Hydrogen Sulfide Removal from Biogas Using Digester Effluent Absorbent in a Continuous Vertical Column

REAKTOR ◽  
2018 ◽  
Vol 18 (03) ◽  
pp. 160
Author(s):  
Sunu Herwi Pranolo ◽  
Paryanto Paryanto ◽  
Margono Margono ◽  
Bachtiar Rizaldy ◽  
Hendrix Yansah
Keyword(s):  
Mass Transfer ◽  
Hydrogen Sulfide ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Average Error ◽  
Vertical Column ◽  
Liquid Phase Mass Transfer ◽  
Steady State Condition ◽  
Sulfide Removal ◽  
Hydrogen Sulfide Removal

HYDROGEN SULFIDE REMOVAL FROM BIOGAS USING DIGESTER EFFLUENT ABSORBENT IN A CONTINUOUS VERTICAL COLUMN. Gas-Liquid mass transfer is one of the most commonly used phenomena in the chemical process, such as absorbtion. This research evaluates the value of liquid phase mass transfer coefficient of hydrogen sulfide removal from biogas in a continous contactor column for digester effluent-biogas system. This study was carried out by contacting biogas at certain flow with digester effluent continously in a counter-current flow packed bed column. Samples were taken in steady state condition. This research used raschig rings, large balls, and small balls as packing materials with surface areas are 0.9269 m2/m3, 0.6279 m2/m3, and 0.2992 m2/m3 respectively at volumetric flow rates of biogas from 0.1109 m3/h to 0.8846 m3/h. The results show that the relationship between the variables and mass transfer coefficient gives following mathematical model This model is valid in the range of (As·dt) and (Vg/dt·DL) respectively from 0.03 to 0.09 and from 237,267.08 to 3,307,522.67. Average error is 17.85%.

On the Prandtl or Schmidt number dependence of the turbulent heat or mass transfer coefficient

2004 ◽  
Vol 59 (3) ◽  
pp. 543-555 ◽  
Author(s):  
Bojan M. Mitrovic ◽  
Phuong M. Le ◽  
Dimitrios V. Papavassiliou
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Schmidt Number ◽  
Turbulent Heat

The Effect of Flow Field on the Mass Transfer Coefficient in the Orifice Downstream

2012 ◽  
Author(s):  
Atsushi Fujishiro ◽  
Feng Shan ◽  
Retsu Kojo ◽  
Momoe Takeuchi ◽  
Yoshiyuki Tsuji
Keyword(s):  
Mass Transfer ◽  
Flow Field ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Swirling Flow ◽  
Thermal Power ◽  
Mass Transfer Rate ◽  
Cross Sectional ◽  
Accelerated Corrosion ◽  
Piv Measurement

Flow accelerated corrosion (FAC) caused many accidents of nuclear energy or thermal-power-generation plants. The main cause of FAC is known as promotion of mass transfer from the wall by the turbulence accompanied by separation, reattachment, and rotating of the flow. However, the relation between mass transfer and flow field is not clarified. In this study, we investigate the relation between the flow field behind the orifice and the mass transfer rate by means of PIV measurement and electrochemical method. It is concluded that the mass transfer coefficient is scaled by the cross-sectional averaged velocity at the orifice UD and the parameter Res in an interaction with a swirling flow.

scholarly journals Simulation of Cooling Film Density Ratios in a Mass Transfer Technique

1989 ◽  
Author(s):  
H. D. Ammari ◽  
N. Hay ◽  
D. Lampard
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Schmidt Number ◽  
Gas Injection ◽  
Systematic Investigation ◽  
Transfer Coefficients ◽  
Film Mass Transfer ◽  
Transfer Method ◽  
Density Ratios

A systematic investigation of the influence of molecular Schmidt number on cooling film mass transfer coefficient has been conducted using a swollen polymer technique and laser holographic interferometry. A variation in Schmidt number by about 28% was accomplished by injection of a foreign gas and gas mixtures through a single normal hole at a blowing rate of one. The experiments were performed at a constant temperature in a subsonic, zero mainstream pressure gradient turbulent boundary layer on a flat plate. The experimental results indicate that Schmidt number has a negligible effect on cooling film mass transfer coefficient within the range examined. Consequently, measurement of cooling film mass transfer coefficients at non-unity density ratios using a mass transfer method with foreign gas injection is experimentally validated.

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