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Principles of Heat Transfer by Frank Kreith, Raj M. Manglik, Mark S. Bohn Book Details
| Book Name | Principles of Heat Transfer |
| Author | Frank Kreith, Raj M. Manglik, Mark S. Bohn |
| Category | Mechanical Engineering Books, Education Books |
| Book Language | English |
| Pages | 784 |
| ISBN | 0495667706 |
| Country | India |
| Book Size | 41 MB |
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About Principles of Heat Transfer by Frank Kreith, Raj M. Manglik, Mark S. Bohn Book
Heat transfer is the process of energy exchange between objects due to temperature differences. It occurs through three main mechanisms: conduction, convection, and radiation. Understanding the principles of heat transfer is crucial for designing efficient heating and cooling systems, thermal insulation, and various engineering applications. Here's an overview of the principles of heat transfer:
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Conduction:
- Definition: Conduction is the transfer of heat through a solid material without the bulk movement of the material itself. It occurs due to the interaction between neighboring atoms and molecules.
- Heat Equation: Fourier's law describes conduction in terms of temperature gradient and material properties. Heat flows from regions of high temperature to regions of low temperature.
- Thermal Conductivity: A material property that quantifies its ability to conduct heat. Materials with high thermal conductivity transfer heat more efficiently.
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Convection:
- Definition: Convection is the transfer of heat through a fluid (liquid or gas) by the actual movement of the fluid. It involves both bulk fluid motion and heat transfer.
- Natural Convection: Occurs when fluid motion is driven by buoyancy forces due to temperature differences. Hot fluids rise, while cooler fluids sink.
- Forced Convection: Involves external forces (fans, pumps) that drive fluid motion, enhancing heat transfer. Common in systems like radiators and heat exchangers.
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Radiation:
- Definition: Radiation is the transfer of heat in the form of electromagnetic waves, such as infrared radiation. Unlike conduction and convection, radiation doesn't require a medium.
- Blackbody Radiation: A perfect emitter and absorber of radiation at all wavelengths. Stefan-Boltzmann law relates the total radiation emitted by a blackbody to its temperature.
- Emissivity: The ratio of actual radiation emitted by a surface to the radiation emitted by a blackbody at the same temperature.
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Heat Exchangers:
- Heat exchangers are devices designed to efficiently transfer heat between two fluids at different temperatures. They are used in various applications, including air conditioning, refrigeration, and power generation.
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Thermal Insulation:
- Insulating materials are designed to minimize heat transfer by conduction, convection, and radiation. Examples include fiberglass, foam, and ceramic materials.
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Fourier's Law of Heat Conduction:
- This law mathematically describes heat conduction: �=−������q=−kAdxdT, where �q is the heat transfer rate, �k is the thermal conductivity, �A is the cross-sectional area, ��dT is the temperature difference, and ��dx is the distance across which heat is transferred.
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Newton's Law of Cooling:
- This law relates the rate of heat loss from a surface to the temperature difference between the surface and its surroundings: �=ℎ�Δ�q=hAΔT, where �q is the heat transfer rate, ℎh is the convective heat transfer coefficient, �A is the surface area, and Δ�ΔT is the temperature difference.
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Heat Transfer Coefficients:
- Convection and radiation involve heat transfer coefficients (ℎh for convection, �σ for radiation) that relate the rate of heat transfer to the temperature difference between the object and the surrounding medium.
Understanding the principles of heat transfer is essential for designing and optimizing thermal systems, energy-efficient buildings, and various industrial processes that involve temperature control.
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