1 / 7

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)

sukey
Download Presentation

I Eat Heat Transfer for Breakfast

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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)

More Related