Heat and mass transfer in heterogeneous catalysis. XXV. The effect of mass transfer between external surface of a non-porous catalyst pellet and a streaming reaction mixture on the selectivity of two consecutive reactions without thermal effect

1971 ◽  
Vol 36 (5) ◽  
pp. 1740-1752
Author(s):  
J. Horák ◽  
P. Chuchvalec
Keyword(s):  
Mass Transfer ◽  
Heterogeneous Catalysis ◽  
Thermal Effect ◽  
Heat And Mass Transfer ◽  
External Surface ◽  
Porous Catalyst ◽  
Consecutive Reactions ◽  
Catalyst Pellet

Heat and Mass Transfer Analogy of Steam Condensation With Air Over Vertical External Surface

2016 ◽  
Author(s):  
Jiqiang Su ◽  
Yuxiang Wu ◽  
Shuliang Huang ◽  
Huiqiang Xu ◽  
Yanmin Zhou
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
External Surface ◽  
Vertical Tube ◽  
External Diameter ◽  
Thermodynamic Process ◽  
Layer Model ◽  
Steam Condensation ◽  
Predicted Values

During the steam condensation, the presence of non-condensable gases is an important issue affecting the efficiency of the whole thermodynamic process. For this reason, many researchers investigated it by theoretical or experimental methods. A heat and mass transfer analogy model on steam condensation in presence of air over the vertical external surface based on the diffusion layer model is modified in the present paper. Based on previous authors’ experience, the suction effect at the gas-liquid interface and other analogy drawbacks are identified and overcome by supplementing it with more detailed analysis as well as targeted experiments. The experimental data obtained for condensation, outside vertical tube with an external diameter of 38 mm, of air/steam and helium/air/steam mixture, have been used to verify the present heat and mass transfer analogy formulation. By comparing against different available experimental data and previous formulations, the heat and mass transfer analogy formulation is demonstrated to be a accurate enough theoretical approximation. The deviation between predicted values of the new model and experiment results of this paper is less than 15% which has relative higher precision.

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