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I Eat Heat Transfer for Breakfast

A study investigating the thawing of the most important meal of the day by Russell Dibb 3/31/2010. I Eat Heat Transfer for Breakfast. How long does it take to thaw foods that come right out of the freezer?. What’s for breakfast?. The process. Freeze food items (~267 K)

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I Eat Heat Transfer for Breakfast

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  1. A study investigating the thawing of the most important meal of the day by Russell Dibb 3/31/2010 I Eat Heat Transfer for Breakfast

  2. How long does it take to thaw foods that come right out of the freezer? What’s for breakfast?

  3. The process Freeze food items (~267 K) Allow for free convection Conduct experiment at room temperature (~295 K) Record and analyze data

  4. results - banana • Cylinder in free convection, h_bar = 6.6 W/m^2 K • Bi = 0.11 • Longer than expected • Errors in measurement • Included peel • Approximate k

  5. results - bread • Sphere in free convection • h_bar = 5.8 W/m^2 K • Bi = 0.22 • Surface measurements most realistic

  6. results - cookie • Plate in two-sided free convection • h_bar = 6.7 W/m^2 K • Bi = 0.04 • Lumped capacitance • Approximated k from weighted average of ingredients

  7. Assumptions and conclusions Air conditions relatively tranquil Radiation neglected for ease of calculation, small temperature difference Models underestimate actual thawing time Exception: bread surface Heat is very unevenly distributed in bread Do not freeze a banana if you intend to eat it (they become squishy and less appetizing)

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