heatTransferCoeff

Description

The heatTransferCoeff function object computes the heat transfer coefficient as a volScalarField for a set of patches.

Operands

Operand	Type	Location
input	-	-
output file	-	-
output field	volScalarField	$FOAM_CASE/<time>/<outField>

Usage

Example of the heatTransferCoeff function object by using functions sub-dictionary in system/controlDict file:

heatTransferCoeff1
{
    // Mandatory entries (unmodifiable)
    type            heatTransferCoeff;
    libs            (fieldFunctionObjects);
    field           <field>;
    patches         (<patch1> <patch2> ... <patchN>);
    htcModel        <htcModel>;
    UInf            (20 0 0);
    Cp              CpInf;
    CpInf           1000;
    rho             rhoInf;
    rhoInf          1.2;

    // Optional (inherited) entries
    result          <fieldResult>;
    region          region0;
    enabled         true;
    log             true;
    timeStart       0;
    timeEnd         1000;
    executeControl  timeStep;
    executeInterval 1;
    writeControl    timeStep;
    writeInterval   1;
}

where the entries mean:

Property	Description	Type	Required	Default
type	Type name: heatTransferCoeff	word	yes	-
libs	Library name: fieldFunctionObjects	word	yes	-
field	Name of the operand field	word	yes	-
patches	Names of the operand patches	wordList	yes	-
htcModel	Model for coefficient computation	word	yes	-
UInf	Reference flow speed	scalar	yes	-
rho	Fluid density	scalar	yes	-

The inherited entries are elaborated in:

• functionObject
• fieldExpression

Example by using the postProcess utility:

postProcess -func "heatTransferCoeff(<field>)"

The following options are available for the htcModel entry:

• ReynoldsAnalogy: Reynolds analogy

$h = 0.5 \rho_\infty C_{p,\infty} |U_{\infty}| C_f$

• localReferenceTemperature: local reference temperature

$h = \frac{q}{T_c - T_w}$

• fixedReferenceTemperature: fixed reference temperature

$h = \frac{q}{T_c - T_{\ref}}$

Further information

Source code:

• heatTransferCoeff

API:

• Foam::functionObjects::heatTransferCoeff

History: Introduced in version v1712