scholarly journals Low-temperature sintering and fabrication research of ceramics and numerical simulation on elastic, pressure drop and heat transfer properties of open cell foams

2016 ◽  
Author(s):  
Zhengwei Andrew Nie
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Pressure Drop ◽  
Low Temperature ◽  
Low Temperature Sintering ◽  
Open Cell ◽  
Open Cell Foams ◽  
Transfer Properties

Analysis of Heat Transfer and Pressure Drop Through Idealized Open Cell Ceramic Foams: Comparison Between Kelvin and Weaire-Phelan Cell Structures

2013 ◽  
Author(s):  
N. Bianco ◽  
S. Cunsolo ◽  
W. K. S. Chiu ◽  
V. Naso ◽  
A. Migliozzi ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Open Source Software ◽  
Surface Evolver ◽  
Open Cell ◽  
Ceramic Foams ◽  
Cell Structures ◽  
Cell Architecture ◽  
Cell Dimensions ◽  
Open Cell Foams

In the applications of metal foams, the knowledge of the thermal transport properties is of primary importance. Thermal properties of a foam heavily depend on its microstructure. However, the influence of some geometric characteristics of the foam cells on their properties is far from being understood. Foam models are promising tools to study the above said effects. The effect of the cell architecture on heat transfer and pressure drop in open cell foams is investigated numerically using two foam models. The Kelvin and the Weaire-Phelan foam models are developed in an open source software “Surface Evolver”. Heat transfer and pressure drop in samples with different porosities and cell dimensions are studied using COMSOL® Multiphysics. Finally, a comparison between the numerical results obtained from two foam models is carried out in order to evaluate the feasibility to substitute the Weaire-Phelan foam structure, which is more complex and computationally heavier, with the simpler Kelvin foam representation.

An appraisal of the heat transfer properties of metallic open-cell foams for strongly exo-/endo-thermic catalytic processes in tubular reactors

2012 ◽  
Vol 198-199 ◽  
pp. 512-528 ◽  
Author(s):  
Enrico Bianchi ◽  
Tobias Heidig ◽  
Carlo Giorgio Visconti ◽  
Gianpiero Groppi ◽  
Hannsjörg Freund ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Open Cell ◽  
Tubular Reactors ◽  
Open Cell Foams ◽  
Catalytic Processes ◽  
Transfer Properties

Numerical simulation of heat transfer in the near-wall region of tubular reactors packed with metal open-cell foams

2015 ◽  
Vol 264 ◽  
pp. 268-279 ◽  
Author(s):  
Enrico Bianchi ◽  
Gianpiero Groppi ◽  
Wilhelm Schwieger ◽  
Enrico Tronconi ◽  
Hannsjörg Freund
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Wall Region ◽  
Open Cell ◽  
Tubular Reactors ◽  
Open Cell Foams ◽  
Near Wall

Numerical Simulation of Heat Transfer Enhanced Tube Inserted Delta-Wing

2014 ◽  
Vol 535 ◽  
pp. 66-70
Author(s):  
Chen Hong Zhao ◽  
Yong Gang Lei
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Pressure Drop ◽  
Inclination Angle ◽  
Delta Wing ◽  
Delta Wings ◽  
Enhanced Tube ◽  
Delta Winglet

Heat transfer and resistance characteristics of a tube inserted delta-winglet (inclination angle is 10 °) are studied by numerical simulation. The results show that the delta-winglet enhance the heat transfer of the enhancement tube inserted delta-winglet and improve the PEC with modest pressure drop penalties. Compared with based tubes, the delta-wings structure enhance the heat transfer 19.52%-31%.

Cost-Efficient Aluminum Open-Cell Foams: Manufacture, Characterization, and Heat Transfer Measurements

2018 ◽  
Vol 20 (8) ◽  
pp. 1701032 ◽  
Author(s):  
Michele Monno ◽  
Daniela Negri ◽  
Valerio Mussi ◽  
Pedram Aghaei ◽  
Gianpiero Groppi ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Open Cell ◽  
Open Cell Foams ◽  
Cost Efficient

Numerical Simulation of Liquid-Liquid Taylor Flow With Heat Transfer

2019 ◽  
Author(s):  
Marcel Kwakkel ◽  
Maria Fernandino ◽  
Carlos A. Dorao
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Spectral Element ◽  
Smooth Transition ◽  
Navier Stokes ◽  
Field Methods ◽  
Taylor Flow ◽  
Dynamic Interface ◽  
Cahn Hilliard Equation ◽  
Transfer Properties

Abstract Numerical simulation of Taylor flows presents several challenges. At the dynamic interface physical properties are discontinuous, which is especially challenging for the thin film between the droplet and the wall. Phase-field methods, which are derived from thermodynamic principles, define the interface as a smooth transition between phases. By coupling the Cahn-Hilliard equation with the Navier-Stokes and energy equation, both interface dynamics and heat transfer can be captured. In the work presented, the resulting system of equations are solved by a parallel h-adaptive least-squares spectral element method. To approximate the solution with sufficient numerical accuracy, C1 Hermite basis functions and a space-time formulation have been applied. It is widely accepted in the literature that the droplet characteristics such as length, velocity and dynamic interaction among them affect the heat transfer properties of Taylor flow. To gain understanding, their effect on heat transfer and pressure drop for liquid-liquid Taylor flow in microchannels must be studied in more detail.

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