BrownianCollisions.C
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25 
26 #include "BrownianCollisions.H"
28 #include "fundamentalConstants.H"
29 
30 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
31 
32 namespace Foam
33 {
34 namespace diameterModels
35 {
36 namespace coalescenceModels
37 {
40  (
44  );
45 }
46 }
47 }
48 
51 
52 
53 // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
54 
57 (
58  const populationBalanceModel& popBal,
59  const dictionary& dict
60 )
61 :
62  coalescenceModel(popBal, dict),
63  A1_(dict.lookupOrDefault<scalar>("A1", 2.514)),
64  A2_(dict.lookupOrDefault<scalar>("A2", 0.8)),
65  A3_(dict.lookupOrDefault<scalar>("A3", 0.55)),
66  sigma_("sigma", dimLength, dict),
67  lambda_
68  (
69  IOobject
70  (
71  "lambda",
72  popBal_.time().name(),
73  popBal_.mesh()
74  ),
75  popBal_.mesh(),
77  (
78  "lambda",
79  dimLength,
80  Zero
81  )
82  )
83 {}
84 
85 
86 // * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
87 
89 {
90  const volScalarField& T = popBal_.continuousPhase().thermo().T();
91  const volScalarField& p = popBal_.continuousPhase().fluidThermo().p();
92 
93  lambda_ = k*T/(sqrt(2.0)*pi*p*sqr(sigma_));
94 }
95 
96 
97 void
100 (
101  volScalarField& coalescenceRate,
102  const label i,
103  const label j
104 )
105 {
106  const sizeGroup& fi = popBal_.sizeGroups()[i];
107  const sizeGroup& fj = popBal_.sizeGroups()[j];
108 
109  const volScalarField& T = popBal_.continuousPhase().thermo().T();
110 
111  tmp<volScalarField> tmu(popBal_.continuousPhase().fluidThermo().mu());
112  const volScalarField& mu = tmu();
113 
114  const volScalarField Cci
115  (
116  1 + lambda_/fi.d()*(A1_ + A2_*exp(-A3_*fi.d()/lambda_))
117  );
118 
119  const volScalarField Ccj
120  (
121  1 + lambda_/fj.d()*(A1_ + A2_*exp(-A3_*fj.d()/lambda_))
122  );
123 
124  coalescenceRate += 8*k*T/(3*mu)*(fi.d() + fj.d())*(Cci/fi.d() + Ccj/fj.d());
125 }
126 
127 
128 // ************************************************************************* //
label k
Macros for easy insertion into run-time selection tables.
Generic GeometricField class.
IOobject defines the attributes of an object for which implicit objectRegistry management is supporte...
Definition: IOobject.H:99
Base class for coalescence models.
Model describing coagulation due to Brownian motion. Utilises collisional diameters and the Cunningha...
virtual void addToCoalescenceRate(volScalarField &coalescenceRate, const label i, const label j)
Add to coalescenceRate.
virtual void precompute()
Precompute diameter independent expressions.
BrownianCollisions(const populationBalanceModel &popBal, const dictionary &dict)
Model for tracking the evolution of a dispersed phase size distribution due to coalescence (synonymou...
Single size class fraction field representing a fixed particle volume as defined by the user through ...
Definition: sizeGroup.H:102
const tmp< volScalarField > d() const
Return representative diameter of the sizeGroup.
Definition: sizeGroup.C:142
A list of keyword definitions, which are a keyword followed by any number of values (e....
Definition: dictionary.H:162
A class for managing temporary objects.
Definition: tmp.H:55
Fundamental dimensioned constants.
const dimensionedScalar k
Boltzmann constant.
const dimensionedScalar mu
Atomic mass unit.
addToRunTimeSelectionTable(coalescenceModel, AdachiStuartFokkink, dictionary)
defineTypeNameAndDebug(AdachiStuartFokkink, 0)
Namespace for OpenFOAM.
static const zero Zero
Definition: zero.H:97
dimensionedScalar exp(const dimensionedScalar &ds)
intWM_LABEL_SIZE_t label
A label is an int32_t or int64_t as specified by the pre-processor macro WM_LABEL_SIZE.
Definition: label.H:59
dimensionedSymmTensor sqr(const dimensionedVector &dv)
word name(const bool)
Return a word representation of a bool.
Definition: boolIO.C:39
const dimensionSet dimLength
dimensionedScalar sqrt(const dimensionedScalar &ds)
void T(FieldField< Field, Type > &f1, const FieldField< Field, Type > &f2)
dictionary dict
volScalarField & p