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Heat transfer processes are classified into three types. The first is conduction, which is defined as transfer of heat occurring through intervening matter without bulk motion of the matter.
- 2.1 SUMMARY OF LAST WEEK LECTURE
- 2.2 CONTACT RESISTANCE
- 2.3 THERMAL RESISTANCES IN PARALLEL
- 2.5 CONDUCTION WITH INTERNAL HEAT GENERATION
- 2.5.1 Heat Generation in a Slab
- 2.7 HEAT TRANSFER ENHANCEMENT USING FINS
- 2.7.1 Temperature Distribution in fins
- Case 2‐ fin is of finite length with end of fin insulated
- 2.7.3 Fin Efficiency
- 2.8 WORKED EXAMPLES
- Example 1
There are three modes of heat transfer: conduction, convection and radiation. We can use the analogy between Electrical and Thermal Conduction processes to simplify the representation of heat flows and thermal resistances. R Fourier’s law relates heat flow to local temperature gradient. T A x ...
In practice materials in thermal contact may not be perfectly bonded and voids at their interface occur. Even a flat surfaces that appear smooth turn out to be rough when examined under microscope with numerous peaks and valleys. Figure 1. Comparison of temperature distribution and heat flow along tw...
We use the electrical analogy to good effect where: q
This situation is often encountered in engineering situations e.g. electrical heating, chemical reactions (endothermic or exothermic).
When there is heat generation in the body, the term q in the general equation is non‐zero. For one dimensional problem such a slab, the conduction equation is
We use a fin on a solid object to increase convective heat transfer by increasing surface area. The fin must be made of a good thermal conductor. Examples of this type of heat transfer enhancement include: Heat sinks on electrical equipment Satellite cooling panels Radiator panels and oil coolers on ...
We use a one‐dimensional approximation and assume that fin cross‐section is constant and perform an energy balance on a small element of the fin. Figure 7. Fin element for energy balance analysis. Energy balance on element is therefore: HEAT ‐ CONDUCTED IN HEAT CONDUCTED OUT =...
Similarly for adiabatic (insulated) tip fin, the heat transfer from the fin can be determined dT
The idea of fin is to increase the surface area, however from the base to the tip the fin surface temperature decreases. In the limiting case of zero thermal resistance or infinite thermal conductivity (k ∞), the temperature of the fin will be uniform at the base value Tb. The heat transfer fro...
We will solve these examples in the lecture together.
The composite wall of an oven consists of three materials as shown below, what is the heat flux, q through the wall? And the thermal conductivity of the middle layer, kb?
- 479KB
- 22
Feb 13, 2018 · Heat loss from a warm room through a wall to the cold outside involves three heat transfer steps in a series: (i) convection at the inside surface of the wall; (ii) conduction through the...
• Heat transfer occurs when a system at one temperature interacts with a system at another temperature. Molecular Diffusion. Bulk Motion. Electromagnetic waves. What is Heat Transfer? • The science of quantification of rate of heat interaction between system and surroundings.
This introduction to heat and mass transfer, oriented toward engineering students, may be downloaded without charge. The ebook is typeset, in pdf format, with eleven chapters, hundreds of figures, and more than 560 exercises. Download A Heat Transfer Textbook.
Heat transfer through a homogeneous and opaque solid occurs by conduction and originates from the difference in temperature between the warm and the cold side of the solid.
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Feb 19, 2024 · Heat Transfer mainly introduces the basic laws of heat conduction, convection and radiation, together with the solving methods and technical measures to control the heat transfer process, and design and check methods for heat exchangers.
