Estimate the 99% boundary layer thickness in the following cases (1) A light breeze over a flat building roof (length=15 m, velocity=5 m/s) (2) A wind passing over an ocean (length=2km, velocity=150 km/h) The kinematic viscosity of air is 1.5x10^(-5) m^2/s. Calculate the Reynolds number based on the boundary layer thickness (instead of the length scale shown above) and the velocity scale in these flows. We assume these flows to be laminar. Choose two answers for the results.

Estimate the 99% boundary layer thickness in the following cases (1) A light breeze over a flat building roof (length=15 m, velocity=5 m/s) (2) A wind passing over an ocean (length=2km, velocity=150 km/h) The kinematic viscosity of air is 1.5x10^(-5) m^2/s. Calculate the Reynolds number based on the boundary layer thickness (instead of the length scale shown above) and the velocity scale in these flows. We assume these flows to be laminar. Choose two answers for the results.

Name: Estimate the 99% boundary layer thickness in the following cases(1) A
Uploaded: 2024-03-20T06:51:10.000Z
Channel: Bartleby
Description: Estimate the 99% boundary layer thickness in the following cases(1) A light breeze over a flat building roof (length=15 m, velocity=5 m/s)(2) A wind passing over an ocean (length=2km, velocity=150 km/h)The kinematic viscosity of air is 1.5x10^(-5) m

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

A simple thermometer is formed by taking a large spherical container of volume 1.13m³ and filling it with an ideal gas. Then, a U-shaped tube is attached that is very narrow so that very little fluid/gas can fit inside the tube. The tube has a small quantity of a fluid of density 1200kg/m³ placed in it. In equilibrium at room temperature - 21.9°C - the height of the fluid on both sides of the U-shaped tube are level. This is illustrated in the image below. What is the temperature of the gas in the spherical container when the left side of the fluid is 13.25cm higher than the right side of the fluid in the U-shaped tube? Atmospheric pressure is 101000Pa. °C
Bacteria have a density that is about the same as water. Their average velocity is 10^-3 m/s. A bacterium with a radius of 1 um should have a diffusion coefficient of about 2.2x10^-13 m^2/s. (a) Find the random-walk step size (b) How long does it take for an average walk to reach 1 mm in seconds and days? Note that we are considering the diffusion away from the starting point and are calculating the distance through three dimensions. Show your work
A smooth circular hole in the bottom of a metal cylinder is 0.04mm in diameter. Ethanol is filled into the cylinder until it drips from the hole. Since the surface tension of the ethanol wetting the metal at ambient temperature is 22.3 dyn / cm and its density is 0.789 g / cm3, what is the minimum height of the ethanol in the cylinder for dripping to begin?
Tire gauges for air pressure, as well as most other gauges used in an industrial environment take into account the pressure due to the atmosphere of earth. That's why your car gauge reads 0 before you put it on your tire to check your pressure. That is called gauge pressure. The real pressure within a tire or other object contains pressurized stuff would be a combination of what the gauge reads as well at the atmospheric pressure. If a gauge on a tire reads 40.16 psi, what is the real pressure in the tire in pascals. The atmospheric pressure is 1.01x10^5 Pa.
Prairie dogs are burrowing rodents. They do not suffocate in their burrows, because the effect of air speed on pressure creates sufficient air circulation. The animals maintain a difference in the shapes of two entrances to the burrow, and because of this difference, the air blows past the openings at different speeds, as the drawing indicates. Assuming that the openings are at the same vertical level, find the difference in air pressure between the openings and indicate which way the air circulates. Vg = 1.1 m/s VA = 8.5 m/s
When you hold your hands at your sides, you may have noticed that the veins sometimes bulge—the height difference between your heart and your hands produces increased pressure in the veins. The same thing happens in the arteries. Estimate the distance that your hands are below your heart. If the average arterial pressure at your heart is a typical 100 mm Hg, what is the average arterial pressure in your hands when they are held at your side?
For the same values as above, find the velocity of air during the test. Given that density and viscosity of air at 5°C are 1.269kg/m³ and 1.754 × 10-5kg/ms.
determine the atmospheric pressure at a location where the barometric reading is 740 mm hg. Assume the temperature of mercury to be 10 degrees Celsius at which its density is 13570 kg/m3
You can smell perfume very shortly after opening the bottle. To show that it is not reaching your nose by diffusion, calculate the average distance a perfume molecule moves in one second in air, given its diffusion constant D to be 1.00 X 10-6 m2/s.
Assume that a raindrop has a volume of 0.05 cm^3 and you need an Avogadro's number of raindrops to fill up the cubic water tank. What is the length of the edge of the tank?
Atmospheric pressure atop Mt. Everest is 3.30×104 N/m2. (a) What is the partial pressure of oxygen there if it is 20.9% of the air? (b) What percent oxygen should a mountain climber breathe so that its partial pressure is the same as at sea level, where atmospheric pressure is 1.01×105 N/m2 ? (c) One of the most severe problems for those climbing very high mountains is the extreme drying of breathing passages. Why does this drying occur?