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Convection Heat Transfer by Adrian Bejan Book Details
| Book Name | Convection Heat Transfer |
| Author | Adrian Bejan |
| Category | Mechanical Engineering Books, Education Books |
| Book Language | English |
| Pages | 281 |
| Country | India |
| Book Size | 28 MB |
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About Convection Heat Transfer by Adrian Bejan Book
Convection heat transfer is one of the three main modes of heat transfer, the other two being conduction and radiation. It involves the transfer of heat between a solid surface and a fluid (liquid or gas) that is in motion. Convection occurs due to the bulk movement of the fluid, which carries heat along with it. There are two types of convection: natural convection and forced convection.
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Natural Convection: This type of convection occurs when there is a temperature difference between a fluid and a solid surface, causing the fluid to heat up and become less dense, leading to its upward movement. As the heated fluid rises, cooler fluid from surrounding areas moves in to take its place, creating a continuous flow pattern. This is commonly observed when you see heated air rising above a hot surface or water boiling in a pot.
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Forced Convection: In forced convection, an external force, such as a fan, pump, or wind, is used to actively move the fluid over a surface, enhancing the heat transfer process. Forced convection is much more efficient than natural convection and is commonly utilized in various engineering applications. For example, cooling systems in electronic devices often use fans to enhance heat dissipation.
Convection heat transfer is governed by several factors, including:
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Fluid velocity: The speed of the fluid moving over the surface affects the rate of heat transfer. Higher fluid velocities generally lead to increased heat transfer.
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Temperature difference: A larger temperature difference between the surface and the fluid results in higher heat transfer rates.
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Fluid properties: The properties of the fluid, such as its density, viscosity, and thermal conductivity, influence how efficiently heat is transferred through convection.
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Geometry and surface characteristics: The shape and roughness of the surface impact the flow patterns of the fluid, which in turn affects heat transfer.
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Flow regime: Depending on the flow conditions, the convection can be classified as laminar (smooth and orderly) or turbulent (chaotic and irregular). Turbulent flow generally leads to more efficient heat transfer due to increased mixing.
Engineers and scientists often use equations and correlations to model and predict convection heat transfer in different situations. The Nusselt number (Nu) is a dimensionless parameter that relates the convective heat transfer rate to the conductive heat transfer rate and is often used in heat transfer analysis. It depends on the flow conditions and geometry of the system.
Convection heat transfer plays a crucial role in many practical applications, such as HVAC systems, heat exchangers, cooling of industrial processes, thermal management in electronics, and many more.
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