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For laminar flow over a flat plate, the local heat transfer coefficient 'hx'varies as x-1/2, where x is the distance from the leading edge (x = 0) ofthe plate. The ratio of the average coefficient 'ha' between the leading edge and some location 'A' at x = x on the plate to the local heat transfer coefficient 'hx' at A is 
  • a)
    1
  • b)
    2
  • c)
    4
  • d)
    8
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
For laminar flow over a flat plate, the local heat transfer coefficien...
Ans. (b) Here at
x = 0, h0 = h and at ,

Average coefficient = 

Therefore ratio =
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Most Upvoted Answer
For laminar flow over a flat plate, the local heat transfer coefficien...
Explanation:
The local heat transfer coefficient hx varies as x-1/2, where x is the distance from the leading edge (x = 0) of the plate.

To find the ratio of the average coefficient ha between the leading edge and some location A at x = x on the plate to the local heat transfer coefficient hx at A, we need to use the formula:

ha/hx = (1/x) ∫(0 to x) (x^-1/2) dx

Simplifying the integral, we get:

ha/hx = 2(√x)/√x - 2(√0)/√0

ha/hx = 2

Therefore, the ratio of the average coefficient ha to the local heat transfer coefficient hx at A is 2.

Answer: b)2
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For laminar flow over a flat plate, the local heat transfer coefficient 'hx'varies as x-1/2, where x is the distance from the leading edge (x = 0) ofthe plate. The ratio of the average coefficient 'ha' between the leading edge and some location 'A' at x = x on the plate to the local heat transfer coefficient 'hx' at A isa)1b)2c)4d)8Correct answer is option 'B'. Can you explain this answer?
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