HELP!

Consider incompressible flow in a circular channel. Derive general expressions for Reynolds number in terms of (a) volume flow r

Georgia [21]

Answer:

a) $Re = \frac{4\cdot \rho \cdot Q}{\pi\cdot \mu\cdot D}$ , b) $Re = \frac{4\cdot \dot m}{\pi\cdot \mu\cdot D}$ , c) 1600

Explanation:

a) The Reynolds Number is modelled after the following formula:

$Re = \frac{\rho \cdot v \cdot D}{\mu}$

Where:

$\rho$ - Fluid density.

$\mu$ - Dynamics viscosity.

$D$ - Diameter of the tube.

$v$ - Fluid speed.

The formula can be expanded as follows:

$Re = \frac{\rho \cdot \frac{4Q}{\pi\cdot D^{2}}\cdot D }{\mu}$

$Re = \frac{4\cdot \rho \cdot Q}{\pi\cdot \mu\cdot D}$

b) The Reynolds Number has this alternative form:

$Re = \frac{4\cdot \dot m}{\pi\cdot \mu\cdot D}$

c) Since the diameter is the same than original tube, the Reynolds number is 1600.

8 0

3 years ago

Which of the following results from the fact that skip signals refracted from the ionosphere are elliptically polarized?

zhenek [66]

Answer:

B

Explanation:

The fact that skip signals refracted from the ionosphere are elliptically polarized is a result of either vertically or horizontally polarized antennas may be used for transmission or reception.

8 0

3 years ago

If the two 304-stainless-steel carriage bolts of the clamp each have a diameter of 10 mmmm, and they hold the cylinder snug with

S_A_V [24]

Answer: hello some data related to your question is missing attached below is the missing data

answer:

T2 = 265°C

Explanation:

First step : calculate sum of vertical forces

∑ y = 0

Fmg - 2(0.5 Fst ) = 0

∴Fmg = ( 12 * 10^6 ) ( 2 * π/4 (0.01)^2 )

= 1884.96 N

Also determine the Compatibility equation in order to determine the change in Temperature

ΔT = 250°C

therefore Temperature at which average normal stress becomes 12.0 MPa

ΔT = T2 - T1

250°C = T2 - 15°C

T2 = 250 + 15 = 265°C

attached below is the detailed solution

4 0

3 years ago

Rewrite the following nested if-else statement as a switch statement that accomplishes exactly the same thing. Assume that num i

seropon [69]

Answer:

Answer explained below

Explanation:

The following is the nested if-else statement:

% if-based statement

if num < -2 || num > 4

f1(num)

else

if num <=2

if num >= 0

f2(num)

else

f3(num)

end

else

f4(num)

end

<u>NOTE:</u> the num is an integer variable that has been initialized and that there are functions f1, f2, f3 and f4.

The nested if-else statement can be replaced by switch statement as shown below:

switch num

case(0, 1, 2)

f2(num)

case(-2, -1)

f3(num)

case(3, 4)

f4(num)

otherwise

f1(num)

In this case, the switch based code is easier to write and understand because the cases are single valued or a few discrete values (not ranges of values)

8 0

3 years ago

Compute the fundamental natural frequency of the transverse vibration of a uniform beam of rectanqular cross section, with one e

marshall27 [118]

Answer:

The natural angular frequency of the rod is 53.56 rad/sec

Explanation:

Since the beam is free at one end and fixed at the other hence the beam is a cantilevered beam as shown in the attached figure

We know that when a unit force is placed at the end of a cantilever the displacement of the free end is given by

$\Delta x=\frac{PL^3}{3EI}$