CN2125: Heat and Mass Transfer 2018-2019


Instructors

Dr. Wang Chi-Hwa, Professor (Heat Transfer + Mass Transfer Fundamentals) Office: E5-02-31; Telephone: 6516-5079; e-mail: chewch@nus.edu.sg

Office and Phone Consultation Hours: (1) 5:00-5:30pm, 21 January. (2) 1:30-2:00pm, 4 February. (3) 5:00-5:30pm, 11 February. (4) 5:00-5:30pm, 18 Feb. (5) 5:00-5:30pm, 4 March (6) 5:00-5:30pm, 5 March (5) 5:00-5:30pm, 11 March. (8) 5:00-5:30pm, 18 March. (9) 5:00-5:30pm, 25 March, (10) 4:00-4:45pm, 15 April, (10) 4:00-4:45pm, 29 April.

Dr. Linga, Praveen, Associate Professor (Mass Transfer + Radiation) Office: E5-02-23; Telephone: 6601-1487; e-mail: chepl@nus.edu.sg

Office and Phone Consultation Hours: to be announced during week 9

Graders

Gokalp Gozaydin (Mass Transfer and Radiation) Office WS02-04-13B / Phone: 6601 1604, E-mail: gokalpgozaydin@u.nus.edu

Dogancan Karan (Mass Transfer and Radiation) Office WS02-04-13B / Phone: 6601 1604, E-mail: dogancan.karan@u.nus.edu

Kan Xiang (Heat Conduction) Office E5-01-01 / Phone: 96491472, E-mail: xiang_kan92@u.nus.edu

Teoh Jia Heng (Mini Project and Industry Lecture Report) Office E4-04-11 / Phone: 83015011, E-mail: e0225106@u.nus.edu

Shen Ye (Heat Convection) Office E4-04-11 / Phone: 93966915, E-mail: shen_ye@u.nus.edu

Li He (Mass Transfer Fundamentals) Office E4-04-11 / Phone: 88262170, E-mail: e0225080@u.nus.edu

 

Recommended textbook:

WELTY J.R., RORRER G. & FOSTER D.G. (2018) Fundamentals of Momentum, Heat, and Mass Transfer CN2125_NUS. Publisher John Wiley & Son, New York. ISBN: 9781119923657

(WRF) WELTY J.R., RORRER G. & FOSTER D.G. (2015) Fundamentals of Momentum, Heat, and Mass Transfer, International Student Version , 6th Edition. Publisher John Wiley & Son, New York.

Other References:

1. (WWWR) WELTY J.R., WICKS C.E., WILSON R.E. & RORRER G. (2007) Fundamentals of Momentum, Heat, and Mass Transfer, 5th Edition. Publisher John Wiley & Son, New York.

2. (ID) INCROPERA F.P.; DEWITT D.P.; BERGMAN T.L.; LAVINE A.S.(2013) Fundamentals of Heat and Mass Transfer, 7th Edition. Publisher John Wiley & Son, New York.

3. CENGEL Y.A. (2007) Heat and Mass Transfer: A Practical Approach , 3rd Edition. Publisher McGraw Hill, New York.

4. Perry's Chemical Engineers' Handbook (2007) , 8rd Edition. Publisher McGraw Hill, New York.

Lecture hours:

LT6, Wednesday 10:00-11:00; LT7A Friday 9:00-11:00.

Homework:

3 assignments during this term. They will be collected immediately after the CN2125 lecture at the respective Lecture Theater.

Assignment 1. Announced on Jan. 21 (week 2) by class announcement and posted in Appendix 1 https://courses.nus.edu.sg/course/chewch/CN2125/lectures/Appendix%201.pdf; Due Feb. 13 (week 5)

Assignment 2. Announced on Feb. 18 (week 6) by e-mail; Due March 13 (week 8)

Assignment 3. Announced on March 25 (week 10) by e-mail; Due April 17 (week 13)

Mini project team report (3-4 students in a team) is due @ 5pm, April 18 (not exceeding 2 pages, Times Roman 12 Point, Single Spacing, Margin = 1 inch ", by e-mail submission from the team chair to Teoh Jia Heng: CN2125@gmail.com)

Industry lecture review report is due @ 5pm, April 18. 3-4 students in a team, same team members as in the mini project. Not exceeding 1 page, Times Roman 12 Point, Single Spacing, Margin = 1 inch ", by e-mail submission from the team chair to Teoh Jia Heng: CN2125@gmail.com)

Quiz:

2 Quizzes (open-book test) to be taken during the CN2125 classes.

Quiz 1 (MPSH M2A): March 6, 10:00-11:00am. Coverage: Week 1-5 Materials. Three questions. Approved models of hand-held calculators may be used.

Quiz 2 (LT6): April 17, 10:05-10:35am. Coverage: Lecture week notes: 9 and 10 [Chapters: 26, 27 & 28 (WWWR)]. One question. Approved models of hand-held calculators may be used.

Lecture Outline

(Subject chapter number in textbook)

http://courses.nus.edu.sg/course/chewch/CN2125/

Domain Name: iso01

Username: heatmass

Download lectures here

Heat Transfer:

Introduction (WRF Chapters 14 & 15, WWWR Chapters 15 & 16, ID Chapters 1-2)
Classification of conduction, convection & radiation.Differential equations of heat transfer. Fundamental concepts.

Steady-state  conduction (WRF Chapter 16, WWWR Chapter 17, ID Chapters 3-4)
One-dimensional conduction.  Heat transfer from extended surfaces.

Unsteady-state conduction    (WRF Chapter 17, WWWR Chapter 18, ID Chapter 5)
Analytical solutions. Numerical solution for transient conduction analysis.

Convective Heat Transfer (WRF Chapter 18, WWWR Chapter 19, ID Chapter 6)
Dimensional analysis. Exact analysis of the laminar boundary layer. Approximate integral analysis of the thermal boundary layer. Energy- and momentum transfer analogies. Turbulent flow considerations. 

Convective Heat- Transfer Correlations (WRF Chapter 19, WWWR Chapter 20, ID Chapters 7-9)
Natural convection. Forced convection for internal flow. Forced convection for external flow.

Boiling and Condensation. (WRF Chapter 20, WWWR Chapter 21, ID Chapter 10)
Boiling. Condensation.

Heat-transfer Equipment. (WWWR Chapter 22, ID Chapter 11)
Heat exchanger, Log-mean temperature difference.

Radiation Heat Transfer (WFR Chapter 21, ID Chapters 12-13)
Thermal radiation. Planck’s law of radiation. Stefan-Boltzmann Law. Emissivity and absorptivity of solid surface. Radiant heat transfer between black bodies. Radiant exchange in black enclosures. Radiant exchange with reradiating surfaces present. Radiant heat transfer between gray surfaces.

Mass Transfer:

Introduction (WRF Chapters 22-23, WWWR Chapters 24 & 25, ID Chapter 14)
Classification of molecular diffusion and convective mass transfer. Fundamental concepts. Differential equations in mass transfer.

Steady State Diffusion (WRF Chapter 24, WWWR Chapter 26)
One-dimensional diffusion with and without chemical reactions. Two and three dimensional systems.

Unsteady State Diffusion (WRF Chapter 25, WWWR Chapter 27)
Fick’s second law. Transient diffusion in semi-infinite medium. Analytical and graphical solutions.

Convective Mass Transfer (WRF Chapter 26 & 27, WWWR Chapter 28 & 29)
Fundamentals and parameters. Dimensional analysis. Analysis of laminar boundary layer. Analogies of mass, energy and momentum transfer. Models for convective mass-transfer coefficients. Two phase mass transfer concepts.