For a smooth sphere, what is the Reynolds number wen the drag coefficient is minimized?
For a smooth sphere, what is the Reynolds number wen the drag coefficient is minimized?
Homework Answers
Add Answer to:
For a smooth sphere, what is the Reynolds number wen the drag
coefficient is minimized?
Literature values for drag coefficient as a function of Reynolds number in a plot NOT table...
Literature values for drag coefficient as a function of Reynolds number in a plot NOT table Include links/sources to the information.
could you please make clear answer? 5. Flow over a Bod;y (a) The drag coefficient for...
could you please make clear answer?
5. Flow over a Bod;y (a) The drag coefficient for a smooth sphere is shown in the figure below. Determine the speed at the critical Re for a 42 mm diameter sphere in air. (This is a golf ball sized object.) You may assume air at 60°F. 0.5 0.4 0.3 0.2 0.1 4 105 Re-Du/v 103 106 107 (b) Ģolthal, "dimples" cause the drag drop to occur at a lower Reynolds number. The table...
QUESTION 3 (14 marks) Variation in drag cylinder is shown in Figure 2 (a) At point coefficient (C...
QUESTION 3 (14 marks) Variation in drag cylinder is shown in Figure 2 (a) At point coefficient (CD) against Reynolds number (Re) for flow around a smooth a, point out whether drag is mainly contributed by pressure drag or friction (8 marks) drag, and explain the reason why (6 marks) (b) Explain the reason why there is a sudden drop in Co at point 400 200 100 40 20 10 60 N C, 6 Smoath cylinder 0.6 0.4 0.2 0.1...
In the falling sphere experiment, the Reynolds number is supposed to be small (smaller than one)I...
In the falling sphere experiment, the Reynolds number is supposed to be small (smaller than one)I the Reynolds number is too large, which of the following forces will be affected (circle the best answer) a) weight of the sphere b) buoyancy force ) drag force d) drag and buoyancy force e) weight, drag, and buoyancy force 1) none of the above
Vid 15. One expression for the Reynolds number is Rem a. Since the Reynolds number must...
Vid 15. One expression for the Reynolds number is Rem a. Since the Reynolds number must be dimensionless, what are the units of the v term in the denominator? b. Does the v term represent the kinematic or dynamic viscosity? c. Find the coefficient of drag of a sphere (d=0.5m) if cold air, with a density of 1.29 kg/m' is blowing on it with a velocity of 35 m/s and a dynamic viscosity of 1.72d0N s/m?.
Experiments show that the coefficient of drag C=F/(1/2ApV^2) for smooth spheres should only be a function...
Experiments show that the coefficient of drag C=F/(1/2ApV^2) for
smooth spheres should only be a function of a Reynold's
number.
8. Experiments show that the coefticient of drag Cp F(Ap) for smooth spheres should only be a function of a Reynold's number, Re PVD/μ). I lere F is the total drag force of the fluid on the sphere, and includes all the viscous and pressure forces, and A is the frontal area A D"4. The drag force ơn small spheres...
The drag force Fp on a smooth sphere falling in water depends on the sphere speed...
The drag force Fp on a smooth sphere falling in water depends on
the sphere speed V, the sphere density P. the density p and dynamic
viscosity of water, the sphere diameter Dand the gravitational
acceleration g. Using dimensional analysis with p. V and D as
repeating variables, determine suitable dimensionless groups to
obtain a reneral relationship between the drag force and the other
variables. If the same sphere were to fall through air, determine
the ratio of the drag...
What is the friction coefficient for a Reynolds number of 1600 and dimensionless roughness of 0.0242?...
What is the friction coefficient for a Reynolds number of 1600 and dimensionless roughness of 0.0242? Keep four decimal places in your answer. What is the friction coefficient for a Reynolds number of 200000 and dimensionless roughness of 0.0196? Keep four decimal places in your answer. A 3.1 cm diameter, 10 meters long pipe has 2 90° regular, threaded elbows, 4 45° long-radius, flanged elbows, 9 unions, 1 ball valve(s), fully open and 1 gate valve(s) half open. Water flows...
The drag coefficient (based on planform area) of an airfoil of chord c and thickness .1c is .008. What is the diameter,...
The drag coefficient (based on planform area) of an airfoil of chord c and thickness .1c is .008. What is the diameter, d, of a circular cylinder with the same drag under the same flow conditions? Assume Reynolds number based on diameter is 105
Drag on cylinders and spheres decreases when the Reynolds number is in the region of 2...
Drag on cylinders and spheres decreases when the Reynolds number is in the region of 2 x 10% since (a) Flow separation occurs due to transition to turbulence (b) Flow separation is delayed due to onset of turbulence (c) Flow separation is advanced due to transition to turbulence (d) Flow reattachment occurs
could you please make clear answer?
5. Flow over a Bod;y (a) The drag coefficient for a smooth sphere is shown in the figure below. Determine the speed at the critical Re for a 42 mm diameter sphere in air. (This is a golf ball sized object.) You may assume air at 60°F. 0.5 0.4 0.3 0.2 0.1 4 105 Re-Du/v 103 106 107 (b) Ģolthal, "dimples" cause the drag drop to occur at a lower Reynolds number. The table...
QUESTION 3 (14 marks) Variation in drag cylinder is shown in Figure 2 (a) At point coefficient (CD) against Reynolds number (Re) for flow around a smooth a, point out whether drag is mainly contributed by pressure drag or friction (8 marks) drag, and explain the reason why (6 marks) (b) Explain the reason why there is a sudden drop in Co at point 400 200 100 40 20 10 60 N C, 6 Smoath cylinder 0.6 0.4 0.2 0.1...
In the falling sphere experiment, the Reynolds number is supposed to be small (smaller than one)I the Reynolds number is too large, which of the following forces will be affected (circle the best answer) a) weight of the sphere b) buoyancy force ) drag force d) drag and buoyancy force e) weight, drag, and buoyancy force 1) none of the above
Vid 15. One expression for the Reynolds number is Rem a. Since the Reynolds number must be dimensionless, what are the units of the v term in the denominator? b. Does the v term represent the kinematic or dynamic viscosity? c. Find the coefficient of drag of a sphere (d=0.5m) if cold air, with a density of 1.29 kg/m' is blowing on it with a velocity of 35 m/s and a dynamic viscosity of 1.72d0N s/m?.
Experiments show that the coefficient of drag C=F/(1/2ApV^2) for
smooth spheres should only be a function of a Reynold's
number.
8. Experiments show that the coefticient of drag Cp F(Ap) for smooth spheres should only be a function of a Reynold's number, Re PVD/μ). I lere F is the total drag force of the fluid on the sphere, and includes all the viscous and pressure forces, and A is the frontal area A D"4. The drag force ơn small spheres...
The drag force Fp on a smooth sphere falling in water depends on
the sphere speed V, the sphere density P. the density p and dynamic
viscosity of water, the sphere diameter Dand the gravitational
acceleration g. Using dimensional analysis with p. V and D as
repeating variables, determine suitable dimensionless groups to
obtain a reneral relationship between the drag force and the other
variables. If the same sphere were to fall through air, determine
the ratio of the drag...
What is the friction coefficient for a Reynolds number of 1600 and dimensionless roughness of 0.0242? Keep four decimal places in your answer. What is the friction coefficient for a Reynolds number of 200000 and dimensionless roughness of 0.0196? Keep four decimal places in your answer. A 3.1 cm diameter, 10 meters long pipe has 2 90° regular, threaded elbows, 4 45° long-radius, flanged elbows, 9 unions, 1 ball valve(s), fully open and 1 gate valve(s) half open. Water flows...
Drag on cylinders and spheres decreases when the Reynolds number is in the region of 2 x 10% since (a) Flow separation occurs due to transition to turbulence (b) Flow separation is delayed due to onset of turbulence (c) Flow separation is advanced due to transition to turbulence (d) Flow reattachment occurs
Most questions answered within 3 hours.
-
The marketing class at CSUS had an average score of 150. An
educational analyst determined that...
asked 1 hour ago -
Justin Case has purchased a $250 000 home by putting 20 % down
and taking out...
asked 1 hour ago -
1. In a labor market, marginal cost for a firm is
____________.
a. recruiting cost
b....
asked 1 hour ago -
On January 1, 2019, ABC Company issued $60,000,000 of 20-year,
10.5% bonds when the market rate...
asked 2 hours ago -
39.4% of US homes continue to use a landline in addition to cell
phone service. 3...
asked 2 hours ago -
Starting with benzene, synthesize 1-phenyl-1-butyne.
Show intermediates and reagents.
asked 3 hours ago -
Create a 32-run crossed array design with six control factors
and two noise factors such that...
asked 4 hours ago -
A 500g sample of sand from source A has the following amounts
retained on each sieve....
asked 4 hours ago -
In
your own words, please explain the essay by John Keynes wrote "The
End of Laissez...
asked 4 hours ago -
How are the matrix and pixels related? Why are smaller
pixels better for diagnostic quality?
asked 4 hours ago -
2. An AC generator has 80 rectangular loops on
its armature. Each loop is 11 cm...
asked 4 hours ago -
Please help me with this question. Consider Aldi’s current and
potential geographic markets (see Exhibit 4...
asked 4 hours ago