Turbulent combustion characteristics of premixed gases in a packed pebble bed at high pressure

Okuyama, Masaki; Suzuki, Takuro; Ogami, Yasuhiro; Kumagami, Manabu; Kobayashi, Haruo

doi:10.1016/j.proci.2010.05.071

Cited by 11 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Arrays of thermocouples were used but due to the strong radiation heat transfer between the thermocouples and the solid phase, they mainly indicated the surface temperature [24]. Two studies describe the unsteady propagation of the bulk flame zone in packed beds through direct visualisation of the flame chemiluminescence by placing the packed bed in a quartz glass cylinder [25,26]. However due to the 3-D flame front and light scattering through the bed, the flame front position cannot be accurately described.…”

Section: Introductionmentioning

confidence: 99%

Spatially resolved investigation of flame particle interaction in a two dimensional model packed bed

Khodsiani¹,

Namdar

Varnik

et al. 2024

Particuology

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Spatially resolved investigation of flame particle interaction in a two dimensional model packed bed

Khodsiani¹,

Namdar

Varnik

et al. 2024

Particuology

View full text Add to dashboard Cite

“…Transitional and turbulent flows through porous media typically take in natural processes such as flow between vegetation (Nepf 1999) and stones in rapids as well as in industrial processes including flow around electronic components (Wibron et al 2018;Emelie et al 2019), within metal foam heat exchangers (Jamarani et al 2017), catalytic convertors (Jouybari et al 2016), drying pellets (Ljung et al 2012) and packed bed combustion (Okuyama et al 2011). The flow regimes are also relevant when considering internal erosion in embankment dams, being one of the primary breach mechanisms (Foster et al 2000).…”

Section: Introductionmentioning

confidence: 99%

The Effects of Periodicity Assumptions in Porous Media Modelling

et al. 2021

View full text Add to dashboard Cite

The effects of periodicity assumptions on the macroscopic properties of packed porous beds are evaluated using a cascaded Lattice-Boltzmann method model. The porous bed is modelled as cubic and staggered packings of mono-radii circular obstructions where the bed porosity is varied by altering the circle radii. The results for the macroscopic properties are validated using previously published results. For unsteady flows, it is found that one unit cell is not enough to represent all structures of the fluid flow which substantially impacts the permeability and dispersive properties of the porous bed. In the steady region, a single unit cell is shown to accurately represent the fluid flow across all cases studied

show abstract

“…However, it is found that the transition to turbulence in porous media occurs at a critical Reynolds number (defined based on pore diameter) of a few hundred [8]. As a result, the flow regime in many industrial applications that incorporate porous media shall be turbulent such as in strip casting [9], packed bed combustion [10], porous burners [11], drying of pellets [12], electronic components including data centers [13], solar heaters [14]. One of the areas in which turbulence in porous media plays an important role is in partially filled pipes incorporated in heat exchangers owing to the high velocity of heat transfer fluid in such applications.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of different heat transfer enhancement mechanisms in a partially porous pipe

2021

View full text Add to dashboard Cite

The effect of porous material position on the heat transfer inside a pipe working in a turbulent regime is studied here to obtain a detailed understanding of the heat transfer enchantment mechanisms in different porous substrate positions. To this end, an in-house Fortran code is developed to solve the governing equations using the finite volume method and SIMPLE algorithm. Turbulent flow in porous media is modeled using a modified version of k–ε model. The flow field and heat transfer inside the partially filled pipe are investigated for the two cases of central and boundary configurations. The porous and flow characteristics including Reynolds number, Darcy number, the conductivity ratios of solid to fluid and the thickness of inserted porous layer are varied and the heat transfer performance is studied in different cases. It is observed that two entirely different phenomena enhance the heat transfer in central and boundary configurations. While the channeling of fluid between the porous media and the pipe wall highly affects the heat transfer performance in the former, the thermal conductivity of porous media plays a highly critical role in the latter configuration. It is shown that, for the same filling ratio, inserting the porous layer at the core of the pipe is more effective than placing it at the wall. Investigating porous materials with different solid conductivities revealed that covering the pipe wall with a porous material is justified only for solid matrixes with high thermal conductivities.

show abstract

Turbulent combustion characteristics of premixed gases in a packed pebble bed at high pressure

Cited by 11 publications

References 12 publications

Spatially resolved investigation of flame particle interaction in a two dimensional model packed bed

Spatially resolved investigation of flame particle interaction in a two dimensional model packed bed

The Effects of Periodicity Assumptions in Porous Media Modelling

A comparative study of different heat transfer enhancement mechanisms in a partially porous pipe

Contact Info

Product

Resources

About