Last Updated | S022020 |

### BME303S

Unit Name | Heat and Mass Transfer |

Unit Code | BME303S |

Unit Duration | 1 Semester |

Award |
Bachelor of Science (Engineering) Duration 3 years |

Year Level | Three |

Unit Creator / Reviewer | N/A |

Core/Sub-Discipline: | Sub-discipline |

Pre/Co-requisites | BSC202C, BME207S |

Credit Points |
3 Total Course Credit Points 81 (27 x 3) |

Mode of Delivery | Online or on-campus. |

Unit Workload | (Total student workload including “contact hours” = 10 hours per week; 5 hours per week for 24 week delivery) Pre-recordings / Lecture – 1.5 hours Tutorial – 1.5 hours Guided labs / Group work / Assessments – 2 hours Personal Study recommended – 5 hours |

## Unit Description and General Aims

The objective in presenting this unit is to provide students with detailed knowledge of heat and mass transfer concepts.

The subject matter covered in this unit will include: an introduction to the fundamental principles and basic laws governing conduction, convection, and radiation heat transfer; heat flow mechanisms; an examination of how fins are designed for maximum efficiency; and, transient temperature charts.

Students will also be instructed on: boundary layer concepts; distinguishing between the physical mechanisms concerning natural and forced convection; dimensional analysis as applied to convection; the basic steps in specifying heat exchanger requirements, selecting an appropriate type for a particular application, and employing LMTD and NTU methods of heat exchanger analysis; drawing analogies between heat and mass transfer mechanisms; and, examining diffusion and convective mass transfer principles in detail.

Project work involving the different aspects of the design and selection of fins, and heat exchangers will also be a component of the unit requirements.

At the conclusion of this unit, students will have been imparted with the requisite knowledge to undertake work utilizing heat and mass transfer concepts such as designing and analysing heat transfer equipment, and specifying and selecting heat exchangers for various applications.

## Learning Outcomes

On successful completion of this Unit, students are expected to be able to:

- Demonstrate knowledge of heat and mass transfer mechanisms and principles.

Bloom’s Level 3 - Define and solve steady-state and transient conduction problems.

Bloom’s Level 4 - Design and analyse heat transfer equipment.

Bloom’s Level 6 - Determine the basic relations in boundary layers.

Bloom’s Level 4 - Distinguish between natural and forced convection mechanisms.

Bloom’s Level 4 - Derive heat transfer correlations in two-phase heat transfer.

Bloom’s Level 4 - Specify and select heat exchangers for various applications.

Bloom’s Level 6

## Student assessment

Assessment Type | When assessed | Weighting (% of total unit marks) | Learning Outcomes Assessed |

Type: Multi-choice test / Group work / Short answer questions / Practical / Remote Lab / Simulation Example Topic: Heat transfer modes, laws, conduction. Students will demonstrate their comprehension of heat transfer modes, the laws governing them and the principles of conduction, by answering a simple quiz and essay type questions. |
Due after Topic 3 | 15% | 1, 2 |

Type: Multi-choice test / Group work / Short answer questions / Practical / Remote Lab / Simulation Example Topic: Fins, boundary layer concepts. Students will provide answers to descriptive questions and solve simple problems to show evidence of their comprehension of heat dissipation, the efficiency of fins, and boundary layer concepts and relations. |
Due after Topic 6 | 20% | 3, 4 |

Type: Multi-choice test / Group work / Short answer questions / Practical / Remote Lab / Simulation / Project / Report Example Topic: Convection, two-phase heat transfer, heat exchangers, radiation. Students will be required to provide descriptive answers and solve problems on the above topics. |
Due after Topic 10 | 20% | 5, 6, 7 |

Type: Exam or project Example Topic: Fins and heat-exchangers. Students will undertake a project work involving different aspects of the design and selection of fins, and heat exchangers. The assessor will specify the format for the same. |
Final Week | 40% | 7 |

Example: Presentation, discussion, group work, exercises, self-assessment/reflection, case study analysis, application. |
Continuous | 5% | 1 to 7 |

## Prescribed and Recommended Readings

**Textbook**

Holman, J 2009, Heat Transfer, 10th edn, McGraw-Hill Education, ISBN: 978-0073529363

Cengel, YA 2005, Heat Transfer: A Practical Approach, 2nd edn, Tata Mcgraw-Hill, ISBN: 9780070594173

**Reference**

Bergman, TL, Incropera, FP & Lavine, AS 2011, Fundamentals of Heat and Mass Transfer, 7th edn, John Wiley & Sons, ISBN: 9780470501979

Ozisik, MN 1985, Heat Transfer: A Basic Approach, illustrated, McGraw-Hill, ISBN: 9780070664609

Kreith, F, Manglik, R & Bohn, M 2010, Principles of Heat Transfer, 7th edn (revised), Cengage Learning, 2010, ISBN: 9780495667704

Nag, PK 2011, Heat And Mass Transfer, 3rd edn, Tata McGraw-Hill Education, ISBN: 978-0070702530

**Journal, website**

www.sciencedirect.com/science/journal/00179310

**Notes and Reference Texts**

Knovel library: http://app.knovel.com

IDC Technologies

Other material advised during the lectures

## Unit Content

#### Topic 1

Introductory Concepts

1. Modes of heat transfer

2. Basic laws governing conduction, convection, and radiation heat transfer

3. Thermal conductivity

4. Fourier’s, Newton’s, and Stefan Boltzmann’s Law

5. The convective heat transfer coefficient

6. Radiation heat transfer

7. Combined heat transfer mechanism

8. Boundary conditions

#### Topics 2 and 3

Conduction

1. Thermal conductivity of solids, liquids, and gases

2. Factors influencing conductivity measurement

3. General differential equation of conduction

4. One dimensional steady state conduction

5. Linear heat flow through a plane and composite wall, tube, and sphere

6. Critical thickness of insulation

7. Effect of variable thermal conductivity

8. Conduction with heat generation in slabs, cylinders, and spheres

9. Conduction in solids with negligible internal temperature gradient (lumped system analysis)

10. Use of transient temperature charts (Heisler’s charts) for transient conduction in slabs, long cylinders, and spheres

11. Use of transient temperature charts for transient conduction in semi-infinite solids

#### Topic 4

Fins

1. Conduction convection system

2. Extended surfaces – rectangular, triangular, circumferential, and pin fins

3. Conduction analysis

4. Fins of uniform and non-uniform cross-sectional area

5. Heat dissipated by fins

6. Effectiveness and efficiency of fins

7. Design of fins for maximum heat transfer

#### Topic 5

Concepts and Basic Relations in Boundary Layers

1. Flow over a body velocity boundary layer

2. Critical Reynold’s Number

3. Drag coefficient and drag force

4. Thermal boundary layer

5. General expression for local heat transfer coefficient

6. Average heat transfer coefficient

7. Flow inside a duct-velocity boundary layer

#### Topic 6

Natural and Forced Convection

1. Physical mechanism of natural convection

2. Application of dimensional analysis for natural convection

3. Grashoff number

4. Empirical relationship for natural convection

5. Physical mechanism of forced convection

6. Application of dimensional analysis for forced convection

7. Physical significance of Reynold’s, Prandtl, Nusselt, and Stanton numbers

8. Flow over plates, flow across cylinders and spheres and flow in tubes

#### Topic 7

Two-Phase Heat Transfer

1. Boiling heat transfer

2. Pool boiling

3. Boiling regimes and boiling curve

4. Pool boiling correlations

5. Condensation heat transfer

6. Film condensation

7. Derivation of average heat transfer coefficient for laminar film condensation over vertical plate

8. Heat transfer correlations for inclined plates, vertical tubes, horizontal bank tubes

#### Topic 8

Heat Exchangers

1. Heat exchanger classification

2. Heat exchanger performance

3. Heat exchanger transfer units

4. Overall heat transfer coefficient

5. Fouling and fouling factor

6. LMTD, NTU methods of analysis of heat exchangers

#### Topics 9 and 10

Radiation Heat Transfer

1. Introduction

2. Absorption and reflection of radiant energy

3. Emission, radiosity and irradiation

4. Black and non-black bodies

5. Stefan-Boltzmann’s Law, Kirchhoff’s Law, Planck’s Law, and Wein’s Displacement Law

6. Radiation heat exchange between two parallel infinite black surfaces

7. Radiation heat exchange between two parallel infinite grey surfaces

8. Non-luminous gas radiation

9. Intensity of radiation and solid angle

10. Effect of radiation shield

11. Lambert’s law; radiation heat exchange between two finite surfaces – configuration factor

#### Topic 11

Mass Transfer

1. Mass and mole concentrations

2. Molecular diffusion

3. Eddy diffusion

4. Molecular diffusion from an evaporating fluid surface

5. Convective mass transfer

6. Wet and dry bulb thermometer

#### Topic 12

Unit Review

In the final week, students will have an opportunity to review the contents covered so far. Opportunity will be provided for a review of student work and to clarify any outstanding issues. Instructors/facilitators may choose to cover a specialized topic if applicable to that cohort.

## Software/Hardware Used

#### Software

- Software: Interactive Heat Transfer software
- Version: 4.0
- Instructions: Download link http://bcs.wiley.com/he-bcs/Books?action=resource&bcsId=6563&itemId=0470501979&resourceId=25674
- Additional resources or files: N/A

#### Hardware

- PC/Laptop