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3 years ago

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Engineering

2 answers:

bekas [8.4K]3 years ago

6 0

Hi i’m confused is this supposed to be a question

ehidna [41]3 years ago

5 0

Answer:

Is this a questions

Explanation:

please I don't understand

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Roman55 [17]

Answer:

Explanation:

6 0

3 years ago

Read 2 more answers

Air, at a free-stream temperature of 27.0°C and a pressure of 1.00 atm, flows over the top surface of a flat plate in parallel f

Morgarella [4.7K]

Answer:

Explanation:

Given that:

V = 12.5m/s

L= 2.70m

b= 0.65m

$T_{ \infty} = 27^0C= 273+27 = 300K$

$T_s= 127^0C = (127+273)= 400K$

P = 1atm

Film temperature

$T_f = \frac{T_s + T_{\infty}}{2} \\\\=\frac{400+300}{2} \\\\=350K$

dynamic viscosity =

$\mu =20.9096\times 10^{-6} m^2/sec$

density = 0.9946kg/m³

Pr = 0.708564

K= 229.7984 * 10⁻³w/mk

Reynolds number,

$Re = \frac{SUD}{\mu} =\frac{\ SUl}{\mu}$

$=\frac{0.9946 \times 12.5\times 2.7}{20.9096\times 10^-^6} \\\\Re=1605375.043$

we have,

$Nu=\frac{hL}{k} =0.037Re^{4/5}Pr^{1/3}\\\\\frac{h\times2.7}{29.79\times 10^-63} =0.037(1605375.043)^{4/5}(0.7085)^{1/3}\\\\h=33.53w/m^2k$

we have,

heat transfer rate from top plate

$\theta _1 =hA(T_s-T_{\infty})\\\\A=Lb\\\\=2.7*0.655\\\\ \theta_1=33.53*2.7*0.65(127/27)\\\\ \theta_1=5884.51w$

7 0

3 years ago

Cell phones require powerful batteries in orde to work effectively. Which activity is best described as an engineering endeavor

natta225 [31]

Where are the options?

8 0

3 years ago

Diffusion of Ammonia in an Aqueous Solution Ammonia (A)-water (B) solution ta 278 K and 4 mm thick is in contact with an organic

Tom [10]

Answer:

Explanation:

The pictures below shows the whole explanation for the problem

4 0

4 years ago

You are an engineer in an electric-generation station. You know that the flames in the boiler reach a temperature of 1200 K and

olga nikolaevna [1]

Answer:

The maximum efficiency the plant will ever achieve is 75%

Explanation:

From the question given, we recall the following:

Th flames in the boiler reaches a temperature of = 1200K

the cooling water is = 300K

The maximum efficiency the plant will achieve is defined as:

Let nmax = 1 - Tmin /Tmax

Where,

Tmin = Minimum Temperature in plants

Tmax = Maximum Temperature in plants

The temperature of the cooling water = Tmin = 300K

The temperature of the flames in boiler = Tmax = 1200k=K

The maximum efficiency becomes:

nmax = 1 - Tmin /Tmax

nmax = 1 - 300 /1200

nmax = 1-1/4 =0.75

nmax = 75%

5 0

4 years ago