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Safe touch temperatures for hot plates
1University of Illinois at Urbana-Champaign, Department of Mechanical and Industrial Engineering 61801, USA.
A new heat transfer model predicts Safe Touch Temperatures (STT) for materials. Key factors influencing STT include thermal conductivity, heat capacity, and plate thickness, ensuring safer equipment handling.
Area of Science:
- Heat Transfer
- Biophysics
- Materials Science
Background:
- Assessing safe handling temperatures for materials is crucial for equipment safety.
- Existing methods for determining Safe Touch Temperatures (STT) have limitations and uncertainties.
Purpose of the Study:
- To develop and validate a finite difference heat transfer model for predicting STT.
- To identify key material and geometric properties influencing STT.
Main Methods:
- Developed a 2D axisymmetric finite difference heat transfer model using the Alternating Direction Implicit method.
- Utilized the Henriques and Moritz damage function to quantify thermal damage.
- Performed parametric analysis to determine influential factors on STT.
Main Results:
- Identified thermal conductivity, volumetric heat capacity, and plate thickness ratio as the most significant parameters affecting STT.
- Predicted STT ranges from 56°C to 100°C based on material and geometric properties.
- Thick metals resulted in lower STT, while thin metals and plastics showed higher STT.
Conclusions:
- The developed model provides a more accurate and reliable method for predicting STT compared to existing practices.
- The findings enable better material selection and design for safe equipment handling.
- The model accounts for uncertainties in skin properties, yielding conservative (safer) STT predictions.
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