Numerical simulation of high-temperature fusion combustion characteristics for a single biomass particle

2019 ◽  
Vol 183 ◽  
pp. 27-34 ◽  
Author(s):  
Yao Xu ◽  
Ming Zhai ◽  
Shuai Jin ◽  
Xun Zou ◽  
Shubin Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Combustion Characteristics

Numerical Simulation of Interior Flow in Evaporation Droplet

2014 ◽  
Author(s):  
Qingming Dong ◽  
Zhentao Wang ◽  
Yonghui Zhang ◽  
Junfeng Wang
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Internal Flow ◽  
Surface Force ◽  
Droplet Surface ◽  
Force Model ◽  
Marangoni Flow ◽  
High Temperature Area ◽  
Interior Flow ◽  
Temperature Area

In this present study, the VOF (Volume of Fluid) approach is adopted to capture the interface, and CSF (Continuum Surface Force) model to calculate the surface tension, and the governing equations are founded in numerical simulation of evaporating droplets. In this work, a water droplet is assumed to be suspending in high temperature air, and the gravity of a droplet is ignored. During evaporating process of the droplet, the internal circulation flow will be induced due to the gradient of temperature at the droplet surface. The interface flows from high temperature area to low temperature area, which pulls the liquid to produce convective flow inside the droplet called as Marangoni flow. Marangoni flow makes the temperature distribution tend to uniformity, which enhances heat transfer but weakens Marangoni flow in turn. So, during droplet evaporation, the internal flow is not steady.

Misbehavior in High Temperature Equilibrium of Water-Gas Reaction

2012 ◽  
Vol 245 ◽  
pp. 346-351
Author(s):  
Radu Dan Rugescu ◽  
Florin Radu Bacaran
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Chemical Equilibrium ◽  
Solid Propellant ◽  
Combustion Products ◽  
Linearization Method ◽  
Gaseous Products ◽  
Direct Linearization ◽  
Temperature Equilibrium ◽  
Water Gas

The observation that the chemical equilibrium between the combustion products of solid propellant samples within static calorimeters is unexpectedly freezing at high temperatures is proved through a general numerical simulation of the isochoric cooling with chemical reactions between the gaseous products. A proprietary, direct linearization method of thermochemical computation is used that enables following any chemical reaction in equilibrium with high convergence. The observed chemical freezing within calorimeters is proved.

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