Modelling of chemical reactors. XI. Non-adiabatic non-isothermal catalytic packed bed reactor; An analysis of a two-dimensional model

1969 ◽  
Vol 34 (12) ◽  
pp. 3664-3672 ◽  
Author(s):  
M. Marek ◽  
V. Hlaváček ◽  
T. M. John
Keyword(s):  
Packed Bed ◽  
Packed Bed Reactor ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Chemical Reactors ◽  
Two Dimensional Model

scholarly journals Applying CFD for Studying the Dynamic and Thermal Behavior of an Indirect Solar Dryer: Paramertric Analysis

2020 ◽  
Vol 22 (1) ◽  
pp. 253-272
Author(s):  
S. Khaldi ◽  
A. N. Korti ◽  
S. Abboudi
Keyword(s):  
Operating Time ◽  
Packed Bed ◽  
Climatic Conditions ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Air Inlet ◽  
Solar Dryer ◽  
Two Dimensional Model ◽  
Turbulent Airflow ◽  
Typical Day

AbstractIn this work, an indirect solar dryer integrated thermal storage for drying figs. (Ficuscarica) is studied numerically. Unsteady turbulent airflow and heat transfer through a two-dimensional model is carried out for a typical day of August under the climatic conditions of Tlemcen (Algeria). Effects of air inlet size and thickness of the packed bed on the dynamic and thermal behaviors of the dryer with and without packed bed have been discussed. The study shows that: (1) Increase the inlet size from 0.04 m to 0.10 m can accelerate the extraction of air by about 13% and reduce the maximum crops temperature by about 14%. (2) The packed bed can reduce the mass flow rate extracted by 22% and the fluctuations of air temperature by 1.3%. (3) A packed bed with a thickness of 0.15 m can extend the operating time of the dryer up to 23%.

Two-Dimensional Model for Oxidative Coupling of Methane in a Packed-Bed Membrane Reactor

2012 ◽  
Vol 35 (2) ◽  
pp. 294-301 ◽  
Author(s):  
N. Holst ◽  
S. Jašo ◽  
H. R. Godini ◽  
S. Glöser ◽  
H. Arellano-Garcia ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Membrane Reactor ◽  
Packed Bed ◽  
Oxidative Coupling Of Methane ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Two Dimensional Model

Commitment to pro- versus counter-attitudinal behavior and the dynamics of social representations

2002 ◽  
Vol 61 (1) ◽  
pp. 34-44 ◽  
Author(s):  
Eric Tafani ◽  
Lionel Souchet
Keyword(s):  
Higher Education ◽  
Social Representations ◽  
Cognitive Restructuring ◽  
Social Representation ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Social Actions ◽  
The Social ◽  
Two Dimensional Model ◽  
Students Attitudes

This research uses the counter-attitudinal essay paradigm ( Janis & King, 1954 ) to test the effects of social actions on social representations. Thus, students wrote either a pro- or a counter-attitudinal essay on Higher Education. Three forms of counter-attitudinal essays were manipulated countering respectively a) students’ attitudes towards higher education; b) peripheral beliefs or c) central beliefs associated with this representation object. After writing the essay, students expressed their attitudes towards higher education and evaluated different beliefs associated with it. The structural status of these beliefs was also assessed by a “calling into question” test ( Flament, 1994a ). Results show that behavior challenging either an attitude or peripheral beliefs induces a rationalization process, giving rise to minor modifications of the representational field. These modifications are only on the social evaluative dimension of the social representation. On the other hand, when the behavior challenges central beliefs, the same rationalization process induces a cognitive restructuring of the representational field, i.e., a structural change in the representation. These results and their implications for the experimental study of representational dynamics are discussed with regard to the two-dimensional model of social representations ( Moliner, 1994 ) and rationalization theory ( Beauvois & Joule, 1996 ).

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