10_part3 - PART 3 INTRODUCTION TO ENGINEERING HEAT TRANSFER...

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PART 3 INTRODUCTION TO ENGINEERING HEAT TRANSFER
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HT-1 Introduction to Engineering Heat Transfer These notes provide an introduction to engineering heat transfer. Heat transfer processes set limits to the performance of aerospace components and systems and the subject is one of an enormous range of application. The notes are intended to describe the three types of heat transfer and provide basic tools to enable the readers to estimate the magnitude of heat transfer rates in realistic aerospace applications. There are also a number of excellent texts on the subject; some accessible references which expand the discussion in the notes are listen in the bibliography.
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HT-2 Table of Tables Table 2.1: Thermal conductivity at room temperature for some metals and non-metals. ............ HT-7 Table 2.2: Utility of plane slab approximation. ......................................................................... HT-17 Table 9.1: Total emittances for different surfaces [from: A Heat Transfer Textbook, J. Lienhard ]HT-63
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HT-3 Table of Figures Figure 1.1: Conduction heat transfer . ........................................................................................ HT-5 Figure 2.1: Heat transfer along a bar . ........................................................................................ HT-6 Figure 2.2: One-dimensional heat conduction . .......................................................................... HT-8 Figure 2.3: Temperature boundary conditions for a slab. ........................................................... HT-9 Figure 2.4: Temperature distribution through a slab . ................................................................ HT-10 Figure 2.5: Heat transfer across a composite slab (series thermal resistance). ........................... HT-11 Figure 2.6: Heat transfer for a wall with dissimilar materials (Parallel thermal resistance). ....... HT-12 Figure 2.7: Heat transfer through an insulated wall . ................................................................. HT-11 Figure 2.8: Temperature distribution through an insulated wall. ............................................... HT-13 Figure 2.9: Cylindrical shell geometry notation. ....................................................................... HT-14 Figure 2.10: Spherical shell. ..................................................................................................... HT-17 Figure 3.1: Turbine blade heat transfer configuration. .............................................................. HT-18 Figure 3.2: Temperature and velocity distributions near a surface. ........................................... HT-19 Figure 3.3: Velocity profile near a surface. ............................................................................... HT-20 Figure 3.4: Momentum and energy exchange in turbulent flow. ............................................... HT-20 Figure 3.5: Heat exchanger configurations. .............................................................................. HT-23 Figure 3.6: Wall with convective heat transfer . ........................................................................ HT-25 Figure 3.7: Cylinder in a flowing fluid. .................................................................................... HT-26 Figure 3.8: Critical radius of insulation. ................................................................................... HT-29 Figure 3.9: Effect of the Biot Number [ hL / k body ] on the temperature distributions in the solid and in the fluid for convective cooling of a body. Note that k body is the thermal conductivity of the body, not of the fluid. ........................................................................................................ HT-31 Figure 3.10: Temperature distribution in a convectively cooled cylinder for different values of Biot number, Bi; r 2 / r 1 = 2 [from: A Heat Transfer Textbook, John H. Lienhard] . .................... HT-32 Figure 4.1: Slab with heat sources (a) overall configuration, (b) elementary slice. .................... HT-32 Figure 4.2: Temperature distribution for slab with distributed heat sources . ............................. HT-34 Figure 5.1: Geometry of heat transfer fin . ................................................................................ HT-35 Figure 5.2: Element of fin showing heat transfer. ..................................................................... HT-36 Figure 5.3: The temperature distribution, tip temperature, and heat flux in a straight one- dimensional fin with the tip insulated. [From: Lienhard, A Heat Transfer Textbook, Prentice- Hall publishers]. ................................................................................................................ HT-40 Figure 6.1: Temperature variation in an object cooled by a flowing fluid . ................................ HT-41 Figure 6.2: Voltage change in an R-C circuit. ........................................................................... HT-42 Figure 8.1: Concentric tube heat exchangers. (a) Parallel flow. (b) Counterflow. ...................... HT-44 Figure 8.2: Cross-flow heat exchangers.
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This note was uploaded on 01/28/2012 for the course AERO 16.050 taught by Professor Zoltanspakovszky during the Fall '02 term at MIT.

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10_part3 - PART 3 INTRODUCTION TO ENGINEERING HEAT TRANSFER...

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