Bubble coalescence model of Liao et al. (2015). The terminal velocities and drag coefficients are computed by an iterative procedure based on the drag model of Ishii and Zuber (1979) at the beginning of the simulation, assuming single bubbles rising in quiescent liquid. More...

Inheritance diagram for LiaoCoalescence:

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Collaboration diagram for LiaoCoalescence:

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Public Member Functions
	TypeName ("Liao")
	Runtime type information. More...

	LiaoCoalescence (const populationBalanceModel &popBal, const dictionary &dict)

virtual	~LiaoCoalescence ()
	Destructor. More...

virtual void	precompute ()
	Precompute diameter independent expressions. More...

virtual void	addToCoalescenceRate (volScalarField &coalescenceRate, const label i, const label j)
	Add to coalescenceRate. More...

Public Member Functions inherited from coalescenceModel
	TypeName ("coalescenceModel")
	Runtime type information. More...

	declareRunTimeSelectionTable (autoPtr, coalescenceModel, dictionary,(const populationBalanceModel &popBal, const dictionary &dict),(popBal, dict))

	coalescenceModel (const populationBalanceModel &popBal, const dictionary &dict)

autoPtr< coalescenceModel >	clone () const

virtual	~coalescenceModel ()
	Destructor. More...

Public Member Functions inherited from LiaoBase
	LiaoBase (const populationBalanceModel &popBal, const dictionary &dict)

virtual	~LiaoBase ()
	Destructor. More...

Additional Inherited Members
Static Public Member Functions inherited from coalescenceModel
static autoPtr< coalescenceModel >	New (const word &type, const populationBalanceModel &popBal, const dictionary &dict)

Protected Attributes inherited from coalescenceModel
const populationBalanceModel &	popBal_
	Reference to the populationBalanceModel. More...

Protected Attributes inherited from LiaoBase
const populationBalanceModel &	populationBalance_
	Reference to the populationBalanceModel. More...

volScalarField	kolmogorovLengthScale_
	Kolmogorov length scale. More...

volScalarField	shearStrainRate_
	Shear strain rate. More...

volScalarField	eddyStrainRate_
	Eddy strain rate. More...

PtrList< dimensionedScalar >	uTerminal_
	Terminal velocities. More...

PtrList< dimensionedScalar >	Cd_
	Drag coefficients. More...

Detailed Description

Bubble coalescence model of Liao et al. (2015). The terminal velocities and drag coefficients are computed by an iterative procedure based on the drag model of Ishii and Zuber (1979) at the beginning of the simulation, assuming single bubbles rising in quiescent liquid.

Note that the original article contains a mistake concerning the value of the coefficient CEff. A value of 2.5 instead of 5.0 should be used when following the Weber number definition in the paper.

References:

    Liao, Y.; Rzehak, R.; Lucas, D.; Krepper, E. (2015).
    Baseline closure models for dispersed bubbly flow: Bubble coalescence
    and breakup.
    Chemical Engineering Science, 122, 336-349.

    Liao, Y., Rzehak, R., Lucas, D., & Krepper, E. (2021).
    Corrigendum to "Baseline closure model for dispersed bubbly flow:
    Bubble coalescence and breakup" [Chem. Eng. Sci. 122 (2015) 336–349].
    Chemical Engineering Science, 241, 116708.

    Ishii, M., & Zuber, N. (1979).
    Drag coefficient and relative velocity in bubbly, droplet or particulate
    flows.
    AIChE Journal, 25(5), 843-855.

Usage

Property	Description	Required	Default value
`PMax`	Maximum packing limit	no	0.8
`CPackMax`	Maximum CPack coefficient	no	1.0e5
`AH`	Hamaker constant	no	3.7e-20
`CEff`	coefficient CEff	no	2.5
`CTurb`	coefficient CTurb	no	1.0
`CBuoy`	coefficient CBuoy	no	1.0
`CShear`	coefficient CShear	no	1.0
`CEddy`	coefficient CEddy	no	1.0
`CWake`	coefficient CWake	no	1.0
`turbulence`	Switch for turbulence	yes	none
`buoyancy`	Switch for buoyancy	yes	none
`laminarShear`	Switch for laminar shear	yes	none
`eddyCapture`	Switch for eddy capture	yes	none
`wake`	Switch for wake entrainment	yes	none

Source files

Definition at line 172 of file LiaoCoalescence.H.

Constructor & Destructor Documentation

◆ LiaoCoalescence()

LiaoCoalescence	(	const populationBalanceModel &	popBal,
		const dictionary &	dict
	)

Definition at line 56 of file LiaoCoalescence.C.

◆ ~LiaoCoalescence()

virtual ~LiaoCoalescence ( )

inlinevirtual

Destructor.

Definition at line 252 of file LiaoCoalescence.H.

Member Function Documentation

◆ TypeName()

TypeName ( "Liao" )

Runtime type information.

◆ precompute()

void precompute ( )

virtual

Precompute diameter independent expressions.

Reimplemented from LiaoBase.

Definition at line 167 of file LiaoCoalescence.C.

References Foam::mag(), Foam::max(), Foam::min(), LiaoBase::precompute(), Foam::SMALL, and Foam::sqrt().

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◆ addToCoalescenceRate()

void addToCoalescenceRate	(	volScalarField &	coalescenceRate,
		const label	i,
		const label	j
	)

virtual

Add to coalescenceRate.

Implements coalescenceModel.

Definition at line 186 of file LiaoCoalescence.C.

References Foam::cbrt(), sizeGroup::dSph(), Foam::exp(), Foam::log(), Foam::mag(), Foam::max(), fluidThermo::mu(), Foam::neg(), sizeGroup::phase(), Foam::constant::mathematical::pi(), Foam::pos0(), Foam::pow6(), phaseModel::rho(), Foam::sqr(), Foam::sqrt(), and phaseModel::thermo().