Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe

Information

Straight pipe

Laminar flow

Calculation of mean convective heat transfer coefficient kc of a straight pipe at an uniform wall temperature or uniform heat flux and for a hydrodynamically developed or undeveloped laminar fluid flow. See more information.

Turbulent flow

Calculation of mean convective heat transfer coefficient kc of a straight pipe for a hydrodynamically developed turbulent fluid flow at uniform wall temperature or See more information.

Package Content

Name	Description
kc_laminar	Mean heat transfer coefficient of straight pipe | uniform wall temperature or uniform heat flux | hydrodynamically developed or undeveloped laminar flow regime
kc_laminar_KC	Mean heat transfer coefficient of straight pipe | uniform wall temperature or uniform heat flux | hydrodynamically developed or undeveloped laminar flow regime
kc_laminar_IN_con	Input record for function kc_laminar and kc_laminar_KC
kc_laminar_IN_var	Input record for function kc_laminar and kc_laminar_KC
kc_overall	Mean heat transfer coefficient of straight pipe | uniform wall temperature or uniform heat flux | hydrodynamically developed or undeveloped overall flow regime| pressure loss dependence
kc_overall_KC	Mean heat transfer coefficient of straight pipe | uniform wall temperature or uniform heat flux | hydrodynamically developed or undeveloped overall flow regime| pressure loss dependence
kc_overall_IN_con	Input record for function kc_overall and kc_overall_KC
kc_overall_IN_var	Input record for function kc_overall and kc_overall_KC
kc_turbulent	Mean heat transfer coefficient of straight pipe | hydrodynamically developed turbulent flow regime | pressure loss dependence
kc_turbulent_KC	Mean heat transfer coefficient of straight pipe | hydrodynamically developed turbulent flow regime | pressure loss dependence
kc_turbulent_IN_con	Input record for function kc_turbulent and kc_turbulent_KC
kc_turbulent_IN_var	Input record for function kc_turbulent and kc_turbulent_KC
kc_twoPhaseOverall_KC	Local two phase heat transfer coefficient of straight pipe | horizontal or vertical boiling | horizontal condensation
kc_twoPhaseOverall_KC_IN_con	Input record for function kc_twoPhaseOverall_KC
kc_twoPhaseOverall_KC_IN_var	Input record for function kc_twoPhaseOverall_KC

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_laminar

Information

Calculation of mean convective heat transfer coefficient kc of a straight pipe at an uniform wall temperature or uniform heat flux and for a hydrodynamically developed or undeveloped laminar fluid flow. Note that additionally a failure status is observed in this function to check if the intended boundary conditions are fulfilled. See more information .

Inputs

Name	Description
Constant inputs
IN_con	Input record for function kc_laminar
Variable inputs
IN_var	Input record for function kc_laminar

Outputs

Name	Description
Output
kc	Convective heat transfer coefficient [W/(m2.K)]
Pr	Prandtl number [1]
Re	Reynolds number [1]
Nu	Nusselt number [1]
failureStatus	0== boundary conditions fulfilled | 1== failure >> check if still meaningful results

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_laminar_KC

Information

Calculation of mean convective heat transfer coefficient kc of a straight pipe at an uniform wall temperature or uniform heat flux and for a hydrodynamically developed or undeveloped laminar fluid flow. See more information .

Inputs

Name	Description
Constant inputs
IN_con	Input record for function kc_laminar_KC
Variable inputs
IN_var	Input record for function kc_laminar_KC

Outputs

Name	Description
kc	Output for function kc_laminar_KC [W/(m2.K)]

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_laminar_IN_con

Information

This record is used as input record for the heat transfer function kc_laminar and kc_laminar_KC.

Parameters

Name	Description
Straight pipe
d_hyd	Hydraulic diameter [m]
L	Length [m]
Choices
target	Choice of heat transfer boundary condition

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_laminar_IN_var

Information

This record is used as input record for the heat transfer function kc_laminar and kc_laminar_KC.

Parameters

Name	Description
Fluid properties
cp	Specific heat capacity of fluid at constant pressure [J/(kg.K)]
eta	Dynamic viscosity of fluid [Pa.s]
lambda	Thermal conductivity of fluid [W/(m.K)]
rho	Density of fluid [kg/m3]
Input
m_flow	[kg/s]

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall

Information

Calculation of mean convective heat transfer coefficient kc of a straight pipe at an uniform wall temperature or uniform heat flux and for a hydrodynamically developed or undeveloped overall fluid flow with neglect or consideration of pressure loss influence. Note that additionally a failure status is observed in this function to check if the intended boundary conditions are fulfilled. See more information .

Inputs

Name	Description
Constant inputs
IN_con	Input record for function kc_overall
Variable inputs
IN_var	Input record for function kc_overall

Outputs

Name	Description
Output
kc	Convective heat transfer coefficient [W/(m2.K)]
Pr	Prandtl number [1]
Re	Reynolds number [1]
Nu	Nusselt number [1]
failureStatus	0== boundary conditions fulfilled | 1== failure >> check if still meaningful results

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall_KC

Information

Calculation of mean convective heat transfer coefficient kc of a straight pipe at an uniform wall temperature or uniform heat flux and for a hydrodynamically developed or undeveloped overall fluid flow with neglect or consideration of pressure loss influence.See more information .

Inputs

Name	Description
Constant inputs
IN_con	Input record for function kc_overall_KC
Variable inputs
IN_var	Input record for function kc_overall_KC

Outputs

Name	Description
kc	Output for function kc_overall_KC [W/(m2.K)]

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall_IN_con

Information

Parameters

Name	Description
Choices
target	Choice of heat transfer boundary condition
roughness	Choice of considering surface roughness
Straight pipe
d_hyd	Hydraulic diameter [m]
L	Length [m]
K	Roughness (average height of surface asperities) [m]

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall_IN_var

Information

Parameters

Name	Description
Fluid properties
cp	Specific heat capacity of fluid at constant pressure [J/(kg.K)]
eta	Dynamic viscosity of fluid [Pa.s]
lambda	Thermal conductivity of fluid [W/(m.K)]
rho	Density of fluid [kg/m3]
Input
m_flow	[kg/s]

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_turbulent

Information

Calculation of mean convective heat transfer coefficient kc of a straight pipe for a hydrodynamically developed turbulent fluid flow at uniform wall temperature or uniform heat flux with neglecting or considering of pressure loss influence. Note that additionally a failure status is observed in this function to check if the intended boundary conditions are fulfilled. See more information .

Inputs

Name	Description
Constant inputs
IN_con	Input record for function kc_turbulent
Variable inputs
IN_var	Input record for function kc_turbulent

Outputs

Name	Description
Output
kc	Convective heat transfer coefficient [W/(m2.K)]
Pr	Prandtl number [1]
Re	Reynolds number [1]
Nu	Nusselt number [1]
failureStatus	0== boundary conditions fulfilled | 1== failure >> check if still meaningful results

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_turbulent_KC

Information

Calculation of mean convective heat transfer coefficient kc of a straight pipe for a hydrodynamically developed turbulent fluid flow at uniform wall temperature or uniform heat flux with neglecting or considering of pressure loss influence. See more information .

Inputs

Name	Description
Constant inputs
IN_con	Input record for function kc_turbulent_KC
Variable inputs
IN_var	Input record for function kc_turbulent_KC

Outputs

Name	Description
kc	Output for function kc_turbulent_KC [W/(m2.K)]

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_turbulent_IN_con

Information

Parameters

Name	Description
Straight pipe
d_hyd	Hydraulic diameter [m]
L	Length [m]
K	Roughness (average height of surface asperities) [m]
Choices
roughness	Choice of considering surface roughness

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_turbulent_IN_var

Information

Parameters

Name	Description
Fluid properties
cp	Specific heat capacity of fluid at constant pressure [J/(kg.K)]
eta	Dynamic viscosity of fluid [Pa.s]
lambda	Thermal conductivity of fluid [W/(m.K)]
rho	Density of fluid [kg/m3]
Input
m_flow	[kg/s]

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_twoPhaseOverall_KC

Information

Calculation of local two phase heat transfer coefficient kc_2ph for (horizontal/vertical) boiling or (horizontal) condensation for an overall flow regime. See more information .

Inputs

Name	Description
Constant inputs
IN_con
Variable inputs
IN_var

Outputs

Name	Description
kc	Local two phase heat transfer coefficient [W/(m2.K)]

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_twoPhaseOverall_KC_IN_con

Information

Parameters

Name	Description
Choices
target	Choice of (horizontal/vertical) boiling or (horizontal) condensation in pipe
Geometry
A_cross	Cross sectional area [m2]
perimeter	Wetted perimeter [m]
Fluid properties
MM	Molar mass of fluid [g/mol]
p_crit	Critical pressure of fluid [Pa]

Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_twoPhaseOverall_KC_IN_var

Information

Parameters

Name	Description
Choices
target	Choice of (horizontal/vertical) boiling or (horizontal) condensation in pipe
Fluid properties
cp_l	Specific heat capacity of liquid [J/(kg.K)]
lambda_l	Thermal conductivity of liquid [W/(m.K)]
rho_g	Density of gas [kg/m3]
rho_l	Density of liquid [kg/m3]
eta_g	Dynamic viscosity of gas [Pa.s]
eta_l	Dynamic viscosity of liquid [Pa.s]
pressure	Mean pressure of fluid [Pa]
dh_lg	Evaporation enthalpy of fluid [J/kg]
Input
m_flow	Mass flow rate [kg/s]
qdot_A	Heat flux at boiling [W/m2]
x_flow	Mass flow rate quality