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engineering and construction - Essay Example
Engineering and Construction
Pages 12 (3012 words)
Table of Contents Task Page Task1 . 1 – 7 Task 2 . 8 – 20 Task3 …
............................................ 30 Task 1 Laminar flow Laminar flow is a type of flow where fluids generally move at low velocity. The layers of the fluid slide by one another. There is no lateral mixing of the fluid and no formation of eddies, cross current or any swirls. Particles of the fluid move in straight line in orderly manner parallel to the boundary walls which can be seen in straight sections of pipes. It generally occurs at a Reynolds number below critical value of 2040. Turbulent flow Turbulent flow is a type of flow that occurs in large velocities characterized with the formation of eddies, swirls and other disturbances in the flow pattern. There is irregularity of flow pattern, fluctuating nature of flow, and diffusivity of particles due to rapid lateral mixing. There is a rapid change in pressure and velocity happening with respect to the space and time. The drag due to boundary layer skin friction is increasing and the overall drag often reduces due to the changing of structure and location of boundary layers. It generally occurs at a Reynolds number greater than 2040. Uniform Flow Uniform flow occurs when the terminal velocity of the flow is reached. This phenomenon arises when the loss of potential energy in flow is equal to the work done against the channel surface friction. If flow properties are the same at every location along the channel, the flow is uniform. dy/dx = 0. ...
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