Drag force acting on bubbles in a subchannel of triangular array of rods

G. Házi, Gusztav Mayer, A. Márkus

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Forces acting on spherical bubbles in a subchannel of a rod bundle with triangular rod arrangement (the pitch to diameter ratio is P / D = 1.34) have been studied at low bubble Reynolds numbers O(0.1) - O(1). The bubble motion has been simulated resolving the interface of the bubble by using the lattice Boltzmann method. Steady drag and virtual mass forces have been determined from the simulation results. Based on the simulation data, the relation CD = 16.375 / ReT could be established between the steady drag coefficient CD and the terminal Reynolds number ReT when the diameter ratio λ = d / D of the bubble d and the channel D is less than 0.2. It is found that the virtual mass coefficient can achieve as high value as 7.2, which is a consequence of strong wall effects. Considering interactions between bubbles, cooperation in the axial direction and hindering in the lateral direction could be observed. We demonstrate that the relation between the terminal velocity of a bubble and that of the suspension follows a Richardson-Zaki like correlation, but the exponent is not only a function of the Eotvos and Morton numbers, but it also depends on the particle configuration.

Original languageEnglish
Pages (from-to)1481-1487
Number of pages7
JournalInternational Journal of Heat and Mass Transfer
Volume52
Issue number5-6
DOIs
Publication statusPublished - Feb 2009

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drag
Drag
Reynolds number
rods
bubbles
Drag coefficient
Suspensions
terminal velocity
drag coefficients
data simulation
Direction compound
bundles
exponents
coefficients
configurations
simulation
interactions

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics
  • Fluid Flow and Transfer Processes

Cite this

Drag force acting on bubbles in a subchannel of triangular array of rods. / Házi, G.; Mayer, Gusztav; Márkus, A.

In: International Journal of Heat and Mass Transfer, Vol. 52, No. 5-6, 02.2009, p. 1481-1487.

Research output: Contribution to journalArticle

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