Heat transfer of a cup of coffee

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SUMMARY

A cup of coffee at 85 degrees Celsius in a 20 degrees Celsius room primarily loses heat through evaporation, with radiation and convection playing significant roles depending on the cup's material and insulation. Conduction is the least impactful heat transfer method in this scenario. The discussion highlights that the heat loss dynamics can vary based on the temperature difference and the specific properties of the cup used. Understanding these factors is crucial for accurately assessing heat loss in common objects.

PREREQUISITES
  • Basic understanding of heat transfer principles
  • Familiarity with the concepts of conduction, convection, and radiation
  • Knowledge of material properties affecting thermal insulation
  • Awareness of the role of evaporation in heat loss
NEXT STEPS
  • Research the principles of heat transfer in different materials
  • Explore the effects of insulation on heat loss in beverages
  • Learn about the specific heat capacities of common cup materials
  • Investigate the role of evaporation in thermal dynamics
USEFUL FOR

Students of thermodynamics, engineers working with thermal systems, and anyone interested in optimizing heat retention in beverages.

kjamha
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does a cup of coffee, say 85 degrees C in a 20 degree C room, lose more heat due to radiation or conduction. In general, do common objects lose more heat due to radiation vs. conduction?
 
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Evaporation is the main effect for hot coffee.

In general, it depends on the materials used and the temperature difference, and you can even have different regions with different dominating effects in the same setup.
 
Of the four choices, conduction is likely the least. The mix of the other three would depend on the cup. Ie, if it is uninsulated, convection and radiation would be proportionally higher.
 

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