Thermal microscale gas flow simulation using wall function and bounce-back scheme: Modified lattice Boltzmann method

Ahangar, Ehsan Kamali; Izanlu, Morteza; Jabbari, Masoud; Ahmadi, Goodarz; Karimipour, Aliakbar

doi:10.1016/j.icheatmasstransfer.2020.104993

Cited by 10 publications

(1 citation statement)

References 54 publications

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“…The Gidaspow drag model [23] was employed to describe the gas-solid momentum transfer, which is widely used in gas-solid two-phase simulation. The wall function method was used near the walls [24]. The main governing equations are as follows:…”

Section: Computational Mesh and Solution Methodsmentioning

confidence: 99%

Numerical Study of the Influence of Secondary Air Uniformity on Jet Penetration and Gas-Solid Diffusion Characteristics in a Large-Scale CFB Boiler

et al. 2021

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The uniformity of secondary air (SA) in large-scale CFB boilers has an important influence on gas-solid flow and combustion, but was seldom considered in previous studies. Numerical simulation based on the Eulerian–Eulerian and RNG k-ε turbulence models was conducted to explore the influence of SA uniformity and load variation on jet penetration, diffusion characteristics and gas-solid mixing in the first 600 MW supercritical CFB boiler. The results showed that better SA uniformity was conductive to the uniformity of SA penetration and gas-solid mixing along the furnace height, although the penetration depth and diffusion distance showed an opposite trend. In addition, the penetration depth and diffusion distance got enhanced with higher boiler load. The inner and outer SA jets could not cover the furnace width, and the uneven SA uniformity led to a huge deviation of the solid concentration within 10 m of the air distributor. Eventually, a calculation model was successfully established for predicting the penetration depth of inclined thermal SA jets during boiler operation.

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Section: Computational Mesh and Solution Methodsmentioning

confidence: 99%