Super-cool paints: optimizing composition with a modified four-flux model

2017 ◽  
Author(s):  
Geoffrey B. Smith ◽  
Marc A. Gali Labarias ◽  
Matthew D. Arnold ◽  
Angus R. Gentle
Keyword(s):  
Flux Model ◽  
Super Cool

scholarly journals Heat Transfer in Nanomaterial Suspension (CuO and Al2O3) Using KKL Model

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 417
Author(s):  
Muhammad Awais ◽  
Saeed Ehsan Awan ◽  
Muhammad Asif Zahoor Raja ◽  
Muhammad Nawaz ◽  
Wasim Ullah Khan ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Angular Momentum ◽  
Diffusion Theory ◽  
Shear Thickening ◽  
Physical Parameters ◽  
Shear Stresses ◽  
Nonlinear Conservation Laws ◽  
Error Analyses ◽  
Flexible Surface ◽  
Flux Model

Novel nonlinear power-law flux models were utilized to model the heat transport phe-nomenon in nano-micropolar fluid over a flexible surface. The nonlinear conservation laws (mass, momentum, energy, mass transport and angular momentum) and KKL cor-relations for nanomaterial under novel flux model were solved numerically. Computed results were used to study the shear-thinning and shear-thickening nature of nano pol-ymer suspension by considering n-diffusion theory. Normalized velocity, temperature and micro-rotation profiles were investigated under the variation of physical parame-ters. Shear stresses at the wall for nanoparticles (CuO and Al2O3) were recorded and dis-played in the table. Error analyses for different physical parameters were prepared for various parameters to validate the obtained results.

scholarly journals Modelling and Simulation of the Radiant Field in an Annular Heterogeneous Photoreactor Using a Four-Flux Model

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
O. Alvarado-Rolon ◽  
R. Natividad ◽  
R. Romero ◽  
L. Hurtado ◽  
A. Ramírez-Serrano
Keyword(s):  
Photocatalytic Oxidation ◽  
Reaction Rate ◽  
Comsol Multiphysics ◽  
Discrete Ordinate Method ◽  
Discrete Ordinate ◽  
Cylindrical Coordinates ◽  
Volumetric Rate ◽  
Flux Model ◽  
Reaction Rate Equation ◽  
Good Agreement

This work focuses on modeling and simulating the absorption and scattering of radiation in a photocatalytic annular reactor. To achieve so, a model based on four fluxes (FFM) of radiation in cylindrical coordinates to describe the radiant field is assessed. This model allows calculating the local volumetric rate energy absorption (LVREA) profiles when the reaction space of the reactors is not a thin film. The obtained results were compared to radiation experimental data from other authors and with the results obtained by discrete ordinate method (DOM) carried out with the Heat Transfer Module of Comsol Multiphysics® 4.4. The FFM showed a good agreement with the results of Monte Carlo method (MC) and the six-flux model (SFM). Through this model, the LVREA is obtained, which is an important parameter to establish the reaction rate equation. In this study, the photocatalytic oxidation of benzyl alcohol to benzaldehyde was carried out, and the kinetic equation for this process was obtained. To perform the simulation, the commercial software COMSOL Multiphysics v. 4.4 was employed.

Modeling impacts of super cool roofs on air temperature at pedestrian level in mesoscale and microscale climate models

Urban Climate ◽  
2021 ◽  
Vol 40 ◽  
pp. 101001
Author(s):  
Tim Sinsel ◽  
Helge Simon ◽  
Ashley M. Broadbent ◽  
Michael Bruse ◽  
Jannik Heusinger
Keyword(s):  
Air Temperature ◽  
Climate Models ◽  
Cool Roofs ◽  
Super Cool
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