{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture 31 - Lecture 31 pls-31.1 Energy Transfer(Heat Media...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 31 pls-31.1 Energy Transfer (Heat) Media: 1. Convection demonstration 2. Excel sheet heat sim 3. Scene from A Christmas Story 3. Melting/nonmelting blocks 1. Convection Convection is energy transfer via macroscopic flow of material from one region to another. Important in fluids (gases and liquids), but not solids. Can be driven by gravity due to changes in density (in part of fluid) with temperature or can be forced (via a fan, e.g.) Demo: Convection demonstration 2. Conduction Conduction is energy transfer through a material that is due only to macroscopic motion inside the material. Important in solids; important in fluids if there is no (or very little) macroscopic flow. If flow is significant, then heat transfer via convection will typically dominate that by conduction. Conduction of energy is due to random , microscopic energy exchange among the constituents (atoms, usually) of a the solid. If a solid material does not initially have a well defined temperature, as illustrated on the left below, this random, microscopic energy exchange will bring the material into thermal equilibrium (such that it is described by one temperature).
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern