class 10 - Introduction to Convection Flow and Thermal...

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Unformatted text preview: Introduction to Convection: Flow and Thermal Considerations Sections 6.1 through 6.3 Class 10 A thick steel slab is initially at 300 o C and is cooled by water jets impinging on one of its surfaces. The temperature of the water is 25 o C, and the jets maintain an extremely large, approximately uniform convection coefficient at the surface. Assuming that the surface is maintained at the temperature of the water throughout the cooling, how long will it take for the temperature to reach 50 o C at a distance of 25 mm from the surface. A thick steel slab is initially at 300 o C and is cooled by water jets impinging on one of its surfaces. The temperature of the water is 25 o C, and the jets maintain an extremely large, approximately uniform convection coefficient at the surface. Assuming that the surface is maintained at the temperature of the water throughout the cooling, how long will it take for the temperature to reach 50 o C at a distance of 25 mm from the surface. What is convection? • so far we’ve used it as part of a boundary condition • it’s energy transfer between a surface and a fluid moving over the surface (at T ∞ ) • what are we going to learn • All about boundary layers • How to find the heat transfer coefficient • A whole lot of new dimensionless parameters Boundary Layers: Physical Features...
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This note was uploaded on 08/13/2011 for the course CHEM 3210 taught by Professor Degrazia during the Fall '10 term at Colorado.

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class 10 - Introduction to Convection Flow and Thermal...

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