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3 years ago

At a retirement party, a coworker described terry as dedicated

Engineering

1 answer:

denis23 [38]3 years ago

8 0

Answer:

At a retirement party, a coworker described Terry as dedicated, hardworking, and dependable. He also said that Terry was a great leader, knew the computer system, and kept the company's finances in order

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2 Consider airflow over a plate surface maintained at a temperature of 220°C. The temperature profile of the airflow is given as

lutik1710 [3]

Answer:

Heat flux on the plate surface is 1.45 x 10⁴ W/m², Heat transfer coefficient is 72.6 W/m². K

Explanation:

The temperature profile of the airflow is given as

T(y) = T∞ – (T∞ - Ts)exp[(-V/α fluid)y]

Calculate the mean film temperature of air

T(f) = T(s) + T∞/2, where T(s) is the surface temperature of the plate and T∞ is the temperature of free stream

Substitute Ts = 220 C and T∞ = 20 C

T(f) = 220 +20/2 = 120 C

Obtain the properties of air from Table A- 15 (Properties of air at 1 atm pressure) in the text book of from the internet at T(f) = 120 C, which would give us the quantities of thermal diffusivity (α fluid) and the thermal conductivity (k) of air

α fluid = 3.565 x 10⁻⁵ m²/s

k = 0.03235 W/m.k

Calculate the temperature gradient for the given profile

T(y) = T∞ – (T∞ - Ts)exp({-V/α fluid}y)

Where, T∞ is the ambient temperate, V is the free stream velocity of air and y is the temperature displacement thickness

Differentiate the expression with respect to y

dT/dY = - (T∞ - Ts){-V/α fluid}e[(-V/α fluid) x 0]

dT/dy = -(T∞ - Ts){-V/α fluid}

Substitute T∞ = 20 C, Ts = 220 C, V = 0.08 m/s and α = 3.565 x 10⁻⁵ m²/s

dT/dy = - (20 - 220)(-0.08/3.565 x 10⁻⁵)

dT/dy = -448807.8541

Calculate the heat flux on the plate surface

Q = -kdT/dy

K = 0.03235 W/m.k, dT/dy = -448807.8541

Q = -(0.03235)(-448807.8541)

Q = 1.45 x 10⁴ W/m²

Therefore, the heat flux on the plate surface is 1.45 x 10⁴ W/m²

Calculate the heat transfer coefficient

Q = h(Ts - T∞), where h is the transfer coefficient

1.45 x 10⁴ = h(220 - 20)

H = 72.6 W/m2.k

Therefore, the heat transfer coefficient is 72.6 W/m². K

6 0

3 years ago

What is the moment that the wrench puts on the bolt?

elena-14-01-66 [18.8K]

Answer:

-60

Explanation:

The moment in the wrench is given by the force multiplied by the perpedincular distance to the bolt. If the force in turning in a clockwise, negative direction, -10 x (2 + 4) = -60 lb-ft.

5 0

3 years ago

What is the difference between the pressure head at the end of a 150m long pipe of diameter 1m coming from the bottom of a reser

uysha [10]

Answer:

$\frac {p_2- p_1}{\rho g} = 31.06 m$

Explanation:

from bernoulli's theorem we have

$\frac{p_1}{\rho g} + \frac{v_1^{2}}{2g} +z_1 = \frac{p_2}{\rho g} + \frac{v_2^{2}}{2g} +z_2 + h_f$

we need to find pressure head difference i.e.

$\frac {p_2- p_1}{\rho g} = (z_1 - z_2) - h_f$

where h_f id head loss

$h_f = \frac{flv^{2}}{D 2g}$

velocity v = $\frac{1}{n} * R^{2/3} S^{2/3}$

$S = \frac{\delta h}{L} = \frac{40}{150} = 0.267$

hydraulic mean radius R = $\frac{A}{P} = \frac{hw}{2h+w}$

$R = \frac{40*1}{2*40+1} = 0.493 m$

so velocity is = $\frac{1}{0.013} * 0.493^{2/3} 0.267^{1/2}$

v = 24.80 m/s

head loss

$h_f = \frac{0.0019*150*24.80^{2}}{1* 2*9.81}$

$h_f =8.93 m$

pressure difference is

$\frac {p_2- p_1}{\rho g} = 40 - 8.93 = 31.06 m$

$\frac {p_2- p_1}{\rho g} = 31.06 m$

4 0

3 years ago

Discuss importance of good communication system

meriva

Answer:

Effective communication helps decision makers by gathering and providing the information to the right person on right time. Communication performs as a motivator to the employees by notifying the employees about the job task, process of carrying and how it could be done better.

7 0

3 years ago

A 100-ampere resistor bank is connected to a controller with conductor insulation rated 75°C. The resistors are not used in conj

Naily [24]

Answer:

answer

Explanation:

6 0

3 years ago