Homework, Quizzes, Simulation Examples — Radiation

Simulation Examples

Several simulation examples are provided here. Each of them comes with a description file, video instructions, and Ansys simulation file. All of the simulations were conducted using Ansys software. Download the student version of Ansys simulation software here.

(1) Baking a Cake in an Oven

An oven employs all three modes of heat transfer: conduction, convection and radiation. Conduction occurs between parts in contact. Forced convection is produced by a fan; outside the oven natural convection exists. The heating coil/element radiates heat inside the oven. In this example, we will model all three modes of heat transfer and see the temperature distribution in a cake. Download the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

(2) Campfire

When sitting around a campfire, we can feel the heat from the burning wood. That heat transfer is not from conduction because air is a very bad heat conductor; it is not from convection either as hot air mainly goes up instead of moving laterally. Thus, the only heat conduction mode left is radiation and that’s what we are going simulate in this example.  We will use simulation to explore the temperature distribution on a human body when a person sits near a campfire. We will also explore how the temperature changes as the person moves closer to or farther away from the campfire. Download the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

Homework

(1) Bathroom Heat Lamp

Infrared heat lamps are primarily used to produce heat rather than light. The filament of a heat lamp produces radiation to heat the room and objects inside of it.  Infrared heat lamps are mostly used for small rooms, like bathrooms.  In this homework problem, we simulate the process of a heat lamp warming up a bathroom within a certain period of time. The simulation is solved as a transient thermal analysis. The bathroom is considered as a perfect enclosure. Radiation occurs between the filament and all the objects in the bathroom. Because of the different view factors, the amount of radiative heat received by different surfaces is different. While doing this homework activity, (1) try to learn how to define surface-to-surface radiation for a perfect enclosure, (2) verify the summation rule for view factors, (3) learn the influence of emissivity of a surface and (4) evaluate temperature and heat flux for part of the model and for the entire model. Download the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.