# How to estimate the heat flow using ANSYS?

Member Posts: 2

Good afternoon,

is it possible to estimate the heat flow (w m^-2) versus the time (s) entering the experimental temperatures in Celsis versus the time (inverse problem)? My 3D domain is a solid one. I appreciate the attention.

The following are the required information.

Properties of solid (3D):

Thermal conductivity k: 43.1 W/(m.K)

Density rho: 14900 kg/m^3

Heat capacity at constant pressure Cp: 332.94 J/(kg.K)

The files "Termocouple 1.txt" and "Termocouple 2.txt" contain the temperatures measured experimentally, in Celsius, versus the time in seconds.

The "Measured Heat flux for comparison.txt" file contains the experimental measured heat flow and can be used for comparison with the numerical inverse technique that will estimate the heat flow (W m^-2) versus time (s).

The files "solid_domain.igs" or "solid_domain.x_b" show the drawing made in SolidWorks for use in numerical simulation, drawn in mm.

The "Results using COMSOL.bmp" file presents the comparison of the heat flows estimated by the Nelder-Mead optimization technique and the heat flow measured experimentally.

Domain Point Probe 1:

Coordinates of thermocouple 1:

x: 0.0043 m; y: 0.0035 m; z: 0.0047 m

Domain Point Probe 2:

Coordinates of thermocouple 2:

x: 0.0035 m; y: 0.0089 m; z: 0.0047 m

Total sample size (x, y, z):

0.0127 x 0.0127 x 0.0047 (m) = 1.27 x 1.27 x 0.47 (cm) =

12.7 x 12.7 x 4.7 (mm)

Data acquisition interval = 0.222000 seconds

Initial sample temperature = 29.2 (ºC) = 302.35 K

Number of thermocouples = 2

Coordinate (s) of the thermocouple (s):

x = 0.0043 (m) y = 0.0035 (m) z = 0.0047 (m)

x = 4.3 (mm) y = 3.5 (mm) z = 4.7 (mm)

x = 0.0035 (m) y = 0.0089 (m) z = 0.0047 (m)

x = 3.5 (mm) y = 8.9 (mm) z = 4.7 (mm)

Area (s) occupied by the heat flow (s)

xo = 0 x = 0.0104 m

yo = 0 y = 0.0104 m

zo = 0.0 z = 0.0

Consider the convection boundary conditions with h = 20 ºC and Tinfinite = 29.221823 ºC. Ie:

heat transfer coefficient h: 20 W/(m^2.K)

External temperature Text: 29.221823 ºC

I appreciate it.

## Comments

• As Ansys employee, I can not download the files. Just wanted to check, are you using APDL? Did you mean, if you apply the temperature, can you get heat flux output? This should be possible.

• Good afternoon,

this. I have done this using other computational packages like COMSOL and programs written in FORTRAN / MatLab with inverse numerical techniques (for the inverse problem), based on Beck's book (BECK, JV; BLACKWELL, B; CLAIR, C. Inverse Heat Conduction: Ill-Posed Problems, Wiley Interscience Publication, New York, 1985.). I have not been using ANSYS APDL. Do you have how to help me? I appreciate the attention. Hugs.

)

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