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As winds blow past buildings, complex flow patterns can develop due to various factors such as flow separation and interactions between adjacent buildings. (See Video V7.13.) Assume that the local gage pressure, p, at a particular location on a building is a function of the air density, ρ, the wind speed, V, some characteristic length, l and all other pertinent lengths, , needed to characterize the geometry of the building or building complex.
(a) Determine a suitable set of dimensionless parameters that can be used to study the pressure distribution.
(b) An eight-story building that is 100 ft tall is to be modeled in a wind tunnel. If a length scale of 1:300 is to be used, how tall should the model building be?
(c) How will a measured pressure in the model be related to the corresponding prototype pressure? Assume the same air density in model and prototype. Based on the assumed variables, does the model wind speed have to be equal to the prototype wind speed? Explain.
The top of the burner is exposed to room conditions (Tsur,t = Too,t = 20°C, ht = 40 W/m2 · K), while the bottom of the burner is exposed to combus to ensure adequate airflow passage through the array. Recommend a design that enhances chip cooling.
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A ford ranger with a mass of 2410 kg is traveling at a velocity of 65 mph down a mount ion road in Colorado. The brakes fail and the driver elects to use a "run away" truck tramp to stop the pickup. What distance in feet will it travel if the ramp ha..
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