1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Andru [333]
3 years ago
14

An object of irregular shape has a characteristic length of � = 1.00 [�] and is maintained at a uniform surface temperature of �

. = 400 [�]. When placed in atmospheric air at a temperature of �- = 300 [�] and moving with a velocity of � = 100 [ 3 . ], the average heat flux from the surface to the air is 13,000[ 2 3&]. If a second object of the same shape, but with a characteristic length of � = 5.00 [�], is maintained at a surface temperature of �. = 400 [�] and is placed in atmospheric air at �- = 300 [�], what will the value of the average convection coefficient be if the air velocity is � = 20 [ 3 . ]?
Engineering
1 answer:
Pani-rosa [81]3 years ago
5 0

The correct question;

An object of irregular shape has a characteristic length of L = 1 m and is maintained at a uniform surface temperature of Ts = 400 K. When placed in atmospheric air at a temperature of Tinfinity = 300 K and moving with a velocity of V = 100 m/s, the average heat flux from the surface to the air is 20,000 W/m² If a second object of the same shape, but with a characteristic length of L = 5 m, is maintained at a surface temperature of Ts = 400 K and is placed in atmospheric air at Too = 300 K, what will the value of the average convection coefficient be if the air velocity is V = 20 m/s?

Answer:

h'_2 = 40 W/K.m²

Explanation:

We are given;

L1 = 1m

L2 = 5m

T_s = 400 K

T_(∞) = 300 K

V = 100 m/s

q = 20,000 W/m²

Both objects have the same shape and density and thus their reynolds number will be the same.

So,

Re_L1 = Re_L2

Thus, V1•L1/v1 = V2•L2/v2

Hence,

(h'_1•L1)/k1 = (h'_2•L2)/k2

Where h'_1 and h'_2 are convection coefficients

Since k1 = k2, thus, we now have;

h'_2 = (h'_1(L1/L2)) = [q/(T_s - T_(∞))]• (L1/L2)

Thus,

h'_2 = [20,000/(400 - 300)]•(1/5)

h'_2 = 40 W/K.m²

You might be interested in
Lagest organs of the human body
aliya0001 [1]

Answer:

skin is the largest organ

3 0
3 years ago
Read 2 more answers
The corner store sells candy in ₵20, ₵30 and ₵50 packages. List all the ways in which the Candyman
Novosadov [1.4K]

Answer: I will list them down below!

Explanation:

He can buy 6, 50 cent candies.

He can buy 30, 20 cent candies.

He can buy 6, 30 cent candies and 6, 20 cent candies.

He can buy 15, 20 cent candies and 3, 50 cent candies.

He can by 3, 20 and 30 cent candies and 3, 50 cent candies.

That's it.

Hope this helps!

6 0
1 year ago
alguien me ayuda con una tarea? Está en mi perfil de matemática, porfavorrr regalaré corona pero porfavor​
tensa zangetsu [6.8K]

Answer:

HUH?

Explanation:

5 0
2 years ago
Brainliest need help
insens350 [35]

Answer:

answer c

Explanation:

4 0
2 years ago
What is the velocity of flow in an asphalt channel that has a hydraulic radius of 3.404 m, length of 200 m and bed slope of 0.00
yKpoI14uk [10]

Answer:

The velocity of flow is 10.0 m/s.

Explanation:

We shall use Manning's equation to calculate the velocity of flow

Velocity of flow by manning's equation is given by

V=\frac{1}{n}R^{2/3}S^{1/2}

where

n = manning's roughness coefficient

R = hydraulic radius

S = bed slope of the channel

We know that for an asphalt channel value of manning's roughness coefficient = 0.016

Applying values in the above equation we obtain velocity of flow as

V=\frac{1}{0.016}\times 3.404^{2/3}\times 0.005^{1/2}\\\\\therefore V=10.000m/s

7 0
3 years ago
Other questions:
  • At a certain elevation, the pilot of a balloon has a mass of 120 lb and a weight of 119 lbf. What is the local acceleration of g
    6·1 answer
  • Can someone please do this for me? I’m so behind on other work for different classes and this one is due today! please I’d appre
    11·1 answer
  • 1) Relative to electrons and electron states, what does each of the four quantum numbers specify?
    10·1 answer
  • The 40-ft-long A-36 steel rails on a train track are laid with a small gap between them to allow for thermal expansion. Determin
    8·1 answer
  • If Fred has already measured 14 inches of a table measuring 30 inches. How many inches does he need to measure more?
    15·1 answer
  • Effective presentations are: Have a central message Colorful and exciting Have many messages Are influence by a setting Created
    15·2 answers
  • What does abbreviation vom stand for
    14·2 answers
  • In-------process the hot drawn bar or rod is pulled through the die.
    7·1 answer
  • In a stream channel, the total volume of water flowing through a cross-section of stream is _______.
    9·1 answer
  • The team needs to choose a primary view for the part drawing. Three team members make suggestions:
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!