General physicsLesson 3 of 3 in the course Heat and Heat Transfer Methods

Convection, Airflow, and Phase-Change Heat Transfer

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Convection is heat transfer by the large-scale movement of matter, such as a moving liquid or gas. As the matter flows, it carries thermal energy from one place to another. Unlike conduction, which transfers energy through interactions between neighboring particles without requiring bulk movement, convection depends on the motion of the fluid itself.

All flashcards

Convection
Heat transfer by the large-scale movement of matter, usually a liquid or gas.
Natural convection
Fluid circulation driven by buoyancy arising from temperature-related density differences.
Wind chill
An equivalent still-air temperature that would produce a similar rate of cooling on exposed skin.
Latent heat of vaporization
The energy required per unit mass to change a liquid into a gas.
Air infiltration
The replacement of indoor air by outside air entering through leaks or openings.

Quiz questions

  1. How does convection differ from conduction?Answer: Convection transfers heat through bulk movement of matter.
  2. What drives natural convection in a fluid?Answer: Temperature differences create density differences that produce buoyant motion.
  3. What does a wind-chill value describe?Answer: The still-air temperature that would produce a similar cooling rate on exposed skin.
  4. Air of mass mm is warmed at constant pressure by a temperature change ΔT\Delta T over time tt. Which expression gives the average heating power?Answer: P=mcpΔTtP=\frac{mc_p\Delta T}{t}
  5. How can condensation help strengthen a developing thunderstorm?Answer: It releases energy that warms rising air and can reinforce upward motion.

Based on College Physics 2e by Paul Peter Urone, Roger Hinrichs (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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