# Homework, Quizzes, Simulation Examples — Convection

## Simulation Examples

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

### (1) Laptop With a Heat Sink

To avoid overheating of a laptop, engineers need to appropriately design for heat absorption and heat dissipation to the open air. A heat sink helps to achieve these goals. In this simulation, we use a simplified laptop geometry to study the effects of a heat sink in cooling down a laptop. Download the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To video file.

### (2) Water-Cooled Heat Sink

Water-cooled heat sinks are preferred because of their high efficiency, low electricity consumption and quiet operation. In this problem, a type of thermal–fluid coupled element is used to simulate the fluid convection effect for a heat sink. Such elements are applied to line geometries with assigned cross-sections. The mass flow rate is needed to define the velocity of the liquid. For convection between a fluid body and a solid body, the bulk temperature is not a parameter that engineers input — it is calculated based on the fluid flow. In this homework example, you should:

(a) Learn how the thermal—fluid coupled element is defined for this conduction—based solver. Try different mass flow rates to see the difference in the results.

(b) Learn how the convection between a fluid and a solid body is defined and understand why it works as it does.

(c) Two geometry files are provided. One is a heat sink with a water pipe, the other is  the same heat sink without the water pipe. Complete both analyses and compare the results.