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UA ATMO 170A1 - Mechanisms for Heat Transfer (Continued)

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ATMO 170A1 1st Edition Lecture 5Outline of Last Lecture I. Energy (Continued)II. Phase Changes (Latent Heat vs. Sensible Heat)III. Definition of Key Terms (Heat, Specific Heat, Etc.)II. Introduction to the Mechanisms for Heat TransferOutline of Current Lecture II. ConductionIII. Convectiona. Free Convectionb. Forced ConvectionIV. RadiationCurrent LectureConduction- Conduction: The Energy transport from hot to cold by random motion of atoms or molecules.◦ Conduction depends on temperature difference. This depends on the material.▪ Aluminum/Copper/Silver (Metal) = Good Conductors▪ Air = A Bad Conductor ◦ If you had a piece of metal at 73°F and a piece of wood at 73°F, the piece of metal would feel colder because it is a good conductor (and takes heat from the hand).◦ “Our perception of cold is a good indicator of how quickly our body loses heat.”These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Convection- Convection: The transfer of heat by the mass movement of a fluid (such as air or water)◦ Occurs in fluid◦ Much more efficient than conduction as a means to transfer heat- Free Convection:◦ 1. The air becomes hotter by conduction.◦ 2. The air begins to expand and become less dense.◦ 3. A bubble begins to rise.◦ 4. A bubble rises on its own (thermals).◦ Free convection happens naturally.- Forced Convection:◦ Convective Circulation: The air around the sand rises → The air gets colder → Cold air sinks → The air around the sand rises◦ Forced convection (advection) is this transfer by wind.Radiation- Radiation can be transferred without a medium. That is, the transfer of energy by radiation can occur in empty space. That is because it propagates in wave form.- Radiation travels at the speed of light (300,000 KM/S).- Frequency and wavelength are related. ◦ Frequency: The number of up and down cycles per second- A slow up and down motion has: ◦ A lower frequency◦ A longer wavelength- A faster up and down motion has:These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.◦ A higher frequency◦ A shorter wavelength.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a


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UA ATMO 170A1 - Mechanisms for Heat Transfer (Continued)

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