scholarly journals Study of Transition Zones in the Carbon Monoxide Catalytic Oxidation on Platinum Using the Network Simulation Method

Mathematics ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1413 ◽  
Author(s):  
Juan Francisco Sánchez-Pérez ◽  
Jose Andres Moreno Nicolas ◽  
Francisco Alhama ◽  
Manuel Canovas
Keyword(s):  
Carbon Monoxide ◽  
Partial Pressure ◽  
Catalytic Oxidation ◽  
Chaotic Behavior ◽  
Network Simulation ◽  
Simulation Method ◽  
Time Step ◽  
Fractional Coverage ◽  
Transition Zones ◽  
Network Simulation Method

A study of transition zones in the carbon monoxide catalytic oxidation over platinum is presented. After the design of a network model following the rules of the Network Simulation Method, it is run in a standard (free) software providing the fractional coverages of all species for different values of carbon monoxide partial pressure, the main parameter that produces the change between a stationary or periodic response. The design of the model is explained in detail and no assumptions are made concerning the removing of oxidation fractional coverage. The illusory chaotic behavior associated with an inadequate time step in the numerical algorithm is studied. This work provides an explanation for the transition (bifurcation) between the stationary and the periodical response studies making use of Poincaré plane and phase-diagrams. The extinction of variable fluctuation in the transition zone is analyzed to understand its relation with given values of transition partial pressures. Of particular interest is the small time span of the superficial fractional coverage of carbon monoxide fluctuation near the second transition partial pressure.

scholarly journals Study of the application of PCM to thermal insulation of UUV hulls using Network Simulation Method

2021 ◽  
Vol 60 (5) ◽  
pp. 4627-4637
Author(s):  
Juan Francisco Sánchez-Pérez ◽  
Carlos Mascaraque-Ramírez ◽  
Jose Andrés Moreno Nicolás ◽  
Enrique Castro ◽  
Manuel Cánovas
Keyword(s):  
Thermal Insulation ◽  
Network Simulation ◽  
Simulation Method ◽  
Network Simulation Method

The MPS-Based Fracture Network Simulation Method: Application to Subsurface Domain

2019 ◽  
Author(s):  
P. Bruna ◽  
R. Prabhakaran ◽  
G. Bertotti ◽  
J. Straubhaar ◽  
R. Plateaux ◽  
...  
Keyword(s):  
Network Simulation ◽  
Simulation Method ◽  
Fracture Network ◽  
Network Simulation Method

An Inverse Determination of Unsteady Heat Fluxes Using a Network Simulation Method

2003 ◽  
Vol 125 (6) ◽  
pp. 1178-1183 ◽  
Author(s):  
F. Alhama ◽  
J. Zueco and ◽  
C. F. Gonza´lez Ferna´ndez
Keyword(s):  
Heat Flux ◽  
Inverse Problem ◽  
Heat Conduction ◽  
Input Data ◽  
Heat Conduction Problem ◽  
Network Simulation ◽  
Simulation Method ◽  
Heat Fluxes ◽  
Incident Heat Flux ◽  
Network Simulation Method

This work addresses unsteady heat conduction in a plane wall subjected to a time-variable incident heat flux. Three different types of flux are studied (sinusoidal, triangular and step waveforms) and constant thermal properties are assumed for simplicity. First, the direct heat conduction problem is solved using the Network Simulation Method (NSM) and the collection of temperatures obtained at given instants is modified by introducing a random error. The resulting temperatures act as the input data for the inverse problem, which is also solved by a sequential approach using the NSM in a simple way. The solution is a continuous piece-wise function obtained step by step by minimizing the classical functional that compares the above input data with those obtained from the solution of the inverse problem. No prior information is used for the functional forms of the unknown heat flux. A piece-wise linear stretches of variable slope and length is used for each of the stretches of the solution. The sensitivity of the functional versus the slope of the line, at each step, is acceptable and the complete piece-wise solution is very close to the exact incident heat flux in all of the mentioned waveforms.

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