Heat Transfer Cengel
Dashonn Moulton
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With complete coverage of the basic principles of heat transfer and a broad range of applications in a flexible format, Heat and Mass Transfer: Fundamentals and Applications, by Yunus Cengel and Afshin Ghajar provides the perfect blend of fundamentals and applications. The text provides a highly intuitive and practical understanding of the material by emphasizing the physics and the underlying physical phenomena involved. This text covers the standard topics of heat transfer with an emphasis on physics and real-world every day applications, while de-emphasizing mathematical aspects. This approach is designed to take advantage of students' intuition, making the learning process easier and more engaging.
McGraw-Hill Education's Connect, is also available as an optional, add on item. Connect is the only integrated learning system that empowers students by continuously adapting to deliver precisely what they need, when they need it, how they need it, so that class time is more effective. Connect allows the professor to assign homework, quizzes, and tests easily and automatically grades and records the scores of the student's work. Problems are randomized to prevent sharing of answers an may also have a "multi-step solution" which helps move the students' learning along if they experience difficulty.
Yunus A. engel is Professor Emeritus of Mechanical Engineering at the University of Nevada, Reno. He received his B.S. in mechanical engineering from Istanbul Technical University and his M.S. and Ph.D. in mechanical engineering from North Carolina State University. His areas of interest are renewable energy, energy efficiency, energy policies, heat transfer enhancement, and engineering education. He served as the director of the Industrial Assessment Center (IAC) at the University of Nevada, Reno, from 1996 to 2000. He has led teams of engineering students to numerous manufacturing facilities in Northern Nevada and California to perform industrial assessments, and has prepared energy conservation, waste minimization, and productivity enhancement reports for them. He has also served as an advisor for various government organizations and corporations.
Dr. engel is the recipient of several outstanding teacher awards, and he has received the ASEE Meriam/Wiley Distinguished Author Award for excellence in authorship in 1992 and again in 2000. Dr. engel is a registered Professional Engineer in the State of Nevada, and is a member of the American Society of Mechanical Engineers (ASME) and the American Society for Engineering Education (ASEE).
On completion of this module students should be able to:
1. Demonstrate an understanding of the basic principles of heat transfer by applying the equations governing steady state heat conduction, convection and radiation to thermal problems.
2. Be able to solve 1-dimensional, steady state heat transfer problems involving convection and conduction through composite walls and pipes.
3. Analyse finned surfaces used to augment convection heat transfer.
4. Utilise experimental correlations in the analysis of convection heat transfer problems.
5. Analyse heat exchanger performance.
6. Understand the role of heat transfer in engineering applications.
Conduction: Conduction Equation. 1-D steady state conduction in plane walls and cylinders. Thermal resistance, thermal resistance networks, U-value, the composite wall and cylinder. Fin heat transfer.
Heat Exchangers: Types of Heat Exchanger, U value and Resistance Analysis. Log-mean temperature difference method. NTU-effectiveness method.
Convection: Forced Convection. External Convection. Internal Convection. Free Convection
The unit develop students' fundamental grasp of the concepts related to heat transfer. These phenomena are ubiquitous in mechanical engineering so a good understanding of them is essential for students to confidently progress to the higher stages of learning and in their future engineering career. This unit builds on material presented in ENG212 Thermal and Fluid Engineering covering more advanced topics in energy transfer and conversion. This provides students a broad range of industrial engineering thermal systems, with an emphasis placed on distinguishing between energy quality and quantity.
Incropera FP and de Witt DP, Fundamentals of Heat and Mass Transfer, 8th edition, Wiley, 2017. (or previous and latest edition), AND Cengel, Y. A, and Boles, M. A., Thermodynamics: An Engineering Approach, 9th edition, McGraw-Hill, 2019. (or previous and latest edition) These have been ordered for the bookshop, and these or earlier editions are available on reserve in the Library. An alternative text (with less material) is Cengel, Heat and Mass Transfer or a Cengel text combining Thermodynamics and Heat transfer.
This paper presents an experimental study, the purpose of which is to know the effect of surface shape on the thermal contact conductance of two solid specimens bonded to each other. The experiment was carried out by placing copper and aluminum specimens in an electric furnace, isolating the surroundings of these specimens and measuring the temperatures at the contact surfaces of the samples. The aluminum specimens used in this study have different surfaces (some specimens have extended surfaces). The experimental results found variations in temperature distribution due to the difference in surface form, by which the aluminum thermal conductivity can be measured at various temperatures ranging from 100oC to 300oC. The results showed the efficiency and effectiveness of extended surfaces and their effect in enhancing heat transfer.
Bu makale, birbirine temas eden iki katı numunenin, yzey şeklinin ısıl temas iletkenliği zerindeki etkisini bulmayı amalayan deneysel bir alışmayı sunar. Deney, bakır ve alminyum numuneleri bir elektrikli fırına yerleştirerek, bu numunelerin evresini izole ederek ve numunelerin temas yzeylerindeki sıcaklıkları llerek gerekleştirilmiştir. Bu alışmada kullanılan alminyum numunelerin farklı yzeyleri vardır (bazı numuneler geniş yzeylere sahiptir). Deneysel sonular, yzey formundaki farklılığa bağlı olarak sıcaklık dağılımında farklılıklar buldu; bu sayede alminyum termal iletkenlik 100C ila 300C arasında değişen eşitli sıcaklıklarda llebilir. Sonular, uzatılmış yzeylerin verimliliğini ve etkililiğini ve ısı transferini artırmadaki etkilerini gsterdi.
HEAT CONDUCTION: General heat conduction equation; boundary and initial conditions; the thermal resistance approach; critical radius of insulation; heat transfer from finned surfaces; lumped system analysis; transient heat conduction in semi-infinite solids; finite difference formulation of differential equations in heat conduction.
HEAT CONVECTION: Fundamentals and preliminary analysis; conservation of mass equation; conservation of momentum equations: newtonian fluids and Navier-Stokes equations; conservation of energy equation; dimensionless forced convection equations and similarity; analogies between momentum and heat transfer; turbulence; Blasius solutions of convection equations for a flat plate; forced convection in tubes; natural convection: Boussinesq assumption; dimensionless natural convection equations.
Students with learning disorders ("Disturbi Specifici di Apprendimento", DSA) will be allowed to use specific modalities and supports that will be determined on a case-by-case basis in agreement with the delegate of the Engineering courses in the Committee for the Inclusion of Students with Disabilities.
To introduce the students to the basic concepts of thermodynamics, heat transfer and fluid flow applied to building energy analysis in terms of building/ thermotechnical plants and building/environment interactions.
Thermodynamics.
Definitions: systems and properties. Units (SI). Closed and opensystems. Forms of energy. First Law. Second law. Entropy. Irreversibility. Closed systems: conservation of mass, conservation of energy. Open
systems: definitions, conservation of mass, conservation of energy, steady and transient processes. Properties of pure substances, equilibrium diagrams (p,v) (p,T). Incompressible substances and their
properties. Vapours: quality and other properties. Ideal gas. Vapor power cycles: Rankine cycle, ideal cycle, reheat. Refrigeration vapour cycle. Coefficient of performance. Thermodynamic efficiency. Simple
multicomponents systems. Ideal gases mixtures.
Mixtures of air and water vapour.
Thermodinamic properties of humid air: specific and absolute humidity, specific entalphy. Psicrometric chart. Dew point temperature. Dry and wet bulb temperature. Psicrometer.
Fluid flow.
Physical aspect of the fluid flow. Coefficient of viscosity. Laminar and turbulent flow. Boundary layer. Reynolds number. Fluid flow in pipes. Integral equations Energy bilance equation. Bernoulli equation. Friction losses. Velocity and mass flow rate measurements in fluids. Compressible
fluids. Mach number.
Heat transfer.
Conduction. Fourier law. Steady state conduction. Electrical analogy. Convection. Dimensional analysis. Thermal boundary layer. Forced, natural and mixed convection. Thermal radiation. Definitions. Laws of
thermal radiation: Plack's law, Stefan-Boltzmann law. View factor. Applications to thermal radiation heat transfer between black and grey surfaces. Overall heat transfer coefficient.