Calculating Heat Transfer Through Sandwich Materials

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SUMMARY

This discussion focuses on calculating heat transfer through a layered assembly of materials, specifically a stainless steel 303 cylinder rod, aluminum 6082 T6 block, polyurethane shore A70 block, and a copper C101 block heated to 250 degrees Celsius. The primary challenge is to determine the temperature at the cylinder rod based on the heat transfer through these materials. Key considerations include the thermal resistance between the components and the ambient environment, with an emphasis on achieving a steady-state condition for accurate predictions. The suggestion is made to build a prototype for empirical temperature measurement as a practical solution.

PREREQUISITES
  • Understanding of heat transfer principles, including conduction and thermal resistance.
  • Familiarity with material properties, specifically thermal conductivity of stainless steel, aluminum, polyurethane, and copper.
  • Knowledge of steady-state thermal analysis and relevant equations.
  • Basic skills in experimental design for temperature measurement.
NEXT STEPS
  • Research the thermal conductivity values for stainless steel 303, aluminum 6082 T6, polyurethane shore A70, and copper C101.
  • Learn about calculating thermal resistance in layered materials using Fourier's law of heat conduction.
  • Explore methods for measuring temperature in experimental setups, including thermocouples and infrared thermometers.
  • Investigate steady-state heat transfer analysis techniques and relevant equations for multi-layer systems.
USEFUL FOR

Engineers, materials scientists, and thermal analysts involved in heat transfer calculations and thermal management in mechanical systems.

Buns_of_Steel
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Hi,

I'm looking for some help regarding heat transfer through some sandwiched materials.

We have a pneumatic cylinder with the stainless steel 303 cylinder rod attached to a block of aluminium 6082 t6 50mm high x 40mm wide x 10mm deep. This block is attached to a block of polyurethane, shore a70 70mm high x 40mm wide x 10mm deep which is then attached to a block of copper c101 70mm high x 40mm wide x 30mm deep. The copper block is heated to a temperature of 250 degrees Celsius. A cross section of the layout is shown below.

What we want to do is treat the arrangement as simply as possible i.e. ignoring the fasteners, holes etc and calculate the heat transfer through the copper, polyurethane, aluminium and into the cylinder rod and get a rough idea of what the temperature will be in the cylinder rod would be.

I'm at a bit of a loss as to where to start with this.

If anyone could help with a basic procedure of how to tackle this problem and what the relevant equations are it would be much appreciated.

Cheers

David
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Unless the rod can transfer heat to the cylinder, and the cylinder to the ambient air, the rod (and the other components) will heat up until it all reaches the temperature of the copper block. You'd need a lot more information to predict the rod temperature, and that would be assuming a steady-state condition. If the copper block temperature varies in time, the problem is even harder to solve. It might be faster to build one and measure the temperature.

Either way, this one should be moved to the engineering sub-forum.
 
You would need to know the thermal resistance between the piston/rod and ambient via the cylinder. I agree easier to build it and measure.
 

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