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Understanding Heat Transfer: Effects of Lid Materials

Explore the impact of various lid materials on heat transfer rates from hot water in a bowl. Different colors influence radiation emission. Convection on external surfaces is the main heat transfer method. Conduction coefficients of materials also affect heat transfer. Shiny, plastic lids are most effective.

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Understanding Heat Transfer: Effects of Lid Materials

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  1. Convective Coefficients for Various Lid Materials Austin Richardson Preston Hennrich

  2. The Project • Our goal was to discover whether having different lid materials would affect the rate of heat transfer from hot water in a bowl • The different colors give a difference in the amount of radiation given off by each lid

  3. Data

  4. Calculations

  5. Calculations Cont.

  6. Summary

  7. Conclusion • The largest method of heat transfer is due to convection on the external surface (due to high h value) • Though heat was transferred through the sides and bottom of the containers, it was assumed constant for each and could then be neglected in order to look at the desired aspects of the experiment (effect of lid type) • h of radiation << h due to convection • For certain materials, h due to radiation might need to be considered, while for others it can be neglected (as seen on the bar graph) • In this case the different conduction coefficients (k) for each material also play a role in the amount of heat transferred, as can be seen by comparing the plastic and foil temperature paths • Conclusion: Shiny, plastic lids would work the best!!

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