Fundamentals of Heat Transfer

• Semester 6, position 3

The aim of the course is to acquire basic knowledge and achieve academic competencies in the field of heat energy transfer, i.e., heat transfer. Mastery of the prescribed material should enable students to: understand the fundamental modes of heat transfer and their physical models, model combined heat transfer, master basic methods of solving equations for steady and unsteady heat transfer, acquire experimental methods, and solve practical problems related to heat transfer.

Upon successful completion of this course, students should be able to: Explain the physical principles and describe the laws of the basic modes of heat transfer. Define the general equation for the temperature field for heat conduction and obtain solutions for solid bodies of various geometries under different boundary and initial conditions. Define expressions and perform calculations for heat transfer in cases of various fluid flow regimes and during phase change of the fluid. Define laws and explain the physics of thermal radiation and determine the heat flow by radiation between gray surfaces. Perform thermal calculations for basic types of heat exchangers.

1. Introduction - Basic modes of heat transfer and fundamental laws of heat transfer; 2. Heat conduction: Fourier's law, thermal conductivity, differential equation of conduction, thermal diffusivity, boundary conditions, initial conditions. 3. Steady heat conduction: heat conduction through bodies of various geometries with and without internal heat sources; heat conduction through rods and finned surfaces; critical thickness of pipe insulation; 4. Unsteady heat conduction: Fourier's method of variable separation; dimensionless criteria, bodies with negligible resistance to heat conduction; 5. Numerical methods for solving heat conduction; 6. Heat transfer by convection: forced and natural convection; Newton's law, similarity theory, heat transfer during fluid condensation and boiling; 7. Thermal radiation: laws of radiation, gray surface, radiative properties of materials, heat transfer by radiation between gray surfaces; 8. Heat exchangers: thermal calculation of heat exchangers (method of the mean logarithmic temperature difference, ε-NTU method).

1. Calculation examples and laboratory exercise for steady heat conduction; 2. Calculation examples and laboratory exercise for heat transfer through finned surfaces; 3. Calculation examples for unsteady heat conduction through solid bodies; 4. Examples of heat conduction calculation using numerical methods; 5. Calculation examples and laboratory exercise for heat transfer by convection; 6. Calculation examples and laboratory exercise for heat transfer by radiation; 7. Calculation examples and laboratory exercise for heat exchangers.

Passed exams in Physics and Thermodynamics.

Laboratory equipment and installations (installation for determining thermal conductivity of solid materials, installation for demonstrating forced and natural convection, installation for demonstrating radiation laws, infrared camera, black body, etc.), required literature, manual, lecture notes.

Total assigned hours: 75

New material: 20
Elaboration and examples (recapitulation): 10

Auditory exercises: 10
Laboratory exercises: 6
Calculation tasks: 10
Seminar paper: 4
Project: 0
Consultations: 0
Discussion/workshop: 0
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 3
Review and grading of seminar papers: 2
Review and grading of the project: 0
Test: 4
Test: 2
Final exam: 4

Activity during lectures: 5
Test/test: 40
Laboratory practice: 10
Calculation tasks: 0
Seminar paper: 5
Project: 0
Final exam: 40
Requirement for taking the exam (required number of points): 20

Milinčić, D.: Heat трансфер, Scientific Book, Belgrade, 1989.; Kozić, Đ., Gojak, M., Komatina, M., Antonijević, D., Saljnikov, A.: Collection of Problems in Heat Transfer, Faculty of Mechanical Engineering, Belgrade, 2002.; Milinčić, D., Vasiljević, B., Đorđević, R.: Problems in Heat Transfer, Faculty of Mechanical Engineering, Belgrade, 1991.; Incropera, F., DeWit, D., Bergman, T, Lavine, A: Introduction to Heat Transfer, Wiley, 5th edition, 912 pages, 2006.; Cengel, Y.: Heat Transfer A Practical Approach, McGraw - Hill; 2nd edition 1024 pages, 2003.