Steady State, Open-System Devices

                                                      A Chemical Engineering Lesson
                                                      Developed by Dr. Don Richards
                                                      Rose-Hulman Institute of Technology
                                              
Instructions to Students

Explanation of the Assignment

One way to reduce the work that all of us have to do to learn new material is to divide up the material, each of us learn about a small part in depth, and then share what we’ve learned with the others. This active learning technique is commonly referred to as Jigsaw because, like a jigsaw puzzle, each of us contributes a small piece of knowledge that helps us understand the big picture. To get the most benefit with the least amount of effort, follow the instructions below carefully. You can obviously do more, but each of us must do the minimum so that we all get the benefit of this tool.

Step #1

Read the handout Open-System Devices

Step #2

Skim Sections 5-6-1 through 5-6-5 in Thermodynamics (6th ed.) by Wark and Richards, McGraw-Hill. This is new material.

Step #3

Each of you will now be randomly selecting a number from a box. This number corresponds to a specific steady-state device. You are to become the expert on this device. The material in parentheses is related reading material in Wark and Richards.   

1. Turbines (WR 5-6-2)

2. Pumps, compressors and fans (or blowers) (WR5-6-2)

3. Nozzles (WR 5-6-1)

4. Diffusers (WR 5-6-1)

5. Throttling devices (WR 5-6-5)

6. Heat exchangers without mixing (WR 5-6-3)

7. Heat exchangers with mixing (mixing devices) (WR 5-6-4)

Step #4

Carefully read the assigned reading material (and any other material you care to read) and complete one of the Open-System Devices Sheet for your assigned device. Use your reading and your own knowledge to determine the purpose, physical or design factors, and operating conditions or modeling assumptions for your device.

On the next class meeting day, you will meet with other people who studied your device, share what you learned, and then create a new Steady-State, Open-System Device Sheet based on your combined knowledge.

You will hand in this new form along with your individual sheets as part of your homework for that day.

Step #5

In addition, you will also be responsible for reviewing the following material in Wark and Richards before the next class date after that.

Chapter 5: Sections 5-1 to 5-4
The following sections are really just review from ES 201:

5-1: Introduction to the concept of open system (control volume)

5-2: Conservation of Mass Principle (Rate form)

5-3: Conservation of Energy Principle (Rate form)

5-4: Steady-state equations

5-5: Hints on problem-solving

Chapter 7: Sections –5-1 to 7-5-2
These sections are also just review from ES 201.

                      Lesson   |   Instruction to Students |  Open-System Devices   |   Open-System Devices Sheet

©2002, Don Richards                                                                                                                                   
These materials may be duplicated for educational purposes if properly credited.