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Test: Nusselt Number


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10 Questions MCQ Test Heat Transfer | Test: Nusselt Number

Test: Nusselt Number for Chemical Engineering 2022 is part of Heat Transfer preparation. The Test: Nusselt Number questions and answers have been prepared according to the Chemical Engineering exam syllabus.The Test: Nusselt Number MCQs are made for Chemical Engineering 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Nusselt Number below.
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Test: Nusselt Number - Question 1

Which quantity signifies the ratio of temperature gradient at the surface to a reference temperature gradient?

Detailed Solution for Test: Nusselt Number - Question 1

It is given by h l/k.

Test: Nusselt Number - Question 2

The determination of value of Nusselt number or the convective film coefficient forms a basis for the computation of heat transfer by convection. Towards that end, following approaches have been suggested
(i) Non-dimensional analysis and experimental correlations
(ii) Hydrodynamic concept of velocity boundary layer
(iii) Reynolds similarity between the mechanism of fluid friction in the boundary layer and the transfer of heat by convection

Detailed Solution for Test: Nusselt Number - Question 2

It should be dimensional analysis and experimental correlations.

Test: Nusselt Number - Question 3

Nusselt number is given by

Detailed Solution for Test: Nusselt Number - Question 3

The length parameter l specifies the geometry of solid body.

Test: Nusselt Number - Question 4

The temperature profile at a particular location in a thermal boundary layer is prescribed by n expression of the form
t (y) = A- B y + C y 2
Where, A, B and Care constants. What is the value of heat transfer coefficient?

Detailed Solution for Test: Nusselt Number - Question 4

h = – k/ (t s – t infinity) [d t/d y] y = 0 and (d t/d y) y = 0 = – B.

Test: Nusselt Number - Question 5

The temperature profile at a particular location on a surface is prescribed by the identity
(t s – t) / (t s – t infinity) = sin (π y/0.015)
If thermal conductivity of air is stated to be 0.03 W/m K, determine the value of convective heat transfer coefficient

Detailed Solution for Test: Nusselt Number - Question 5

h = – k/ (t s – t infinity) [d t/d y] y = 0. Therefore h = – k/ (t s – t infinity) [π (t s – tinfinity)/0.015].

Test: Nusselt Number - Question 6

Air at 20 degree Celsius flows over a flat plate maintained at 75 degree Celsius. Measurements shows that temperature at a distance of 0.5 mm from the surface of plate is 50 degree Celsius. Presuming thermal conductivity of air is 0.0266 W/m K, estimate the value of local heat transfer coefficient

Detailed Solution for Test: Nusselt Number - Question 6

h = – k/ (t s – t infinity) [d t/d y] y = 0 and d t/d y = – 50 * 10 3 degree Celsius/m.

Test: Nusselt Number - Question 7

Air at 20 degree Celsius flows over a flat surface maintained at 80 degree Celsius. Estimate the value of local heat transfer coefficient if the local heat flow at a point was measured as 1250 W/m2. Take thermal conductivity of air as 0.028 W/m K

Detailed Solution for Test: Nusselt Number - Question 7

Q = h A (t s – t infinity).

Test: Nusselt Number - Question 8

Consider the above problem, calculate the temperature gradient at the surface

Detailed Solution for Test: Nusselt Number - Question 8

(d t/d y) y = 0 = – h (t s – t infinity)/k

Test: Nusselt Number - Question 9

At the interface of solid body, heat flows by conduction and is given by

Detailed Solution for Test: Nusselt Number - Question 9

Q = – k A (d t/d y) y = 0.

Test: Nusselt Number - Question 10

For a given value of Nusselt number, the convective surface coefficient h is directly proportional to

Detailed Solution for Test: Nusselt Number - Question 10

It is directly proportional to k and inversely proportional to significant length.

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