Hydrodynamic And Thermal Boundary Layers MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Hydrodynamic And Thermal Boundary Layers, a fundamental topic in the field of Heat Transfer. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Hydrodynamic And Thermal Boundary Layers MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Hydrodynamic And Thermal Boundary Layers mcq questions that explore various aspects of Hydrodynamic And Thermal Boundary Layers problems. Each MCQ is crafted to challenge your understanding of Hydrodynamic And Thermal Boundary Layers principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Heat Transfer tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Hydrodynamic And Thermal Boundary Layers MCQs are your pathway to success in mastering this essential Heat Transfer topic.

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Hydrodynamic And Thermal Boundary Layers MCQs | Page 1 of 5

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Q1.
Which field is set up when a fluid flows past a heated or cold surface?

a.

Energy

b.

Temperature

c.

Mass

d.

Time

Discuss
Answer: (b).Temperature
Q2.
The zone or thin layer wherein the temperature field exists is called the

a.

Single boundary layer

b.

Multi boundary layer

c.

Hydrodynamic boundary layer

d.

Thermal boundary layer

Discuss
Answer: (d).Thermal boundary layer
Q3.
The thickness of thermal boundary layer is arbitrarily defined as the distance from the plate surface at which

a.

t S โ€“ t/t S โ€“ t INFINITY = 0.34

b.

t S โ€“ t/t S โ€“ t INFINITY = 0.10

c.

t S โ€“ t/t S โ€“ t INFINITY = 0.99

d.

t S โ€“ t/t S โ€“ t INFINITY = 0.87

Discuss
Answer: (c).t S โ€“ t/t S โ€“ t INFINITY = 0.99
Q4.
The convection of energy reduces the outward conduction in the fluid so temperature gradient

a.

Decreases

b.

Increases

c.

Constant

d.

Becomes twice

Discuss
Answer: (a).Decreases
Q5.
The velocity profile of the hydrodynamic boundary layer is dependent upon

a.

Time

b.

Viscosity

c.

Temperature

d.

Mass

Discuss
Answer: (b).Viscosity
Q6.
Which is true for two dimensional boundary layer?

a.

d u/d x โ€“ d v/d y = 1

b.

d u/d x โ€“ d v/d y = 0

c.

d u/d x + d v/d y = 1

d.

d u/d x + d v/d y = 0

Discuss
Answer: (d).d u/d x + d v/d y = 0
Q7.
The differential energy equation for flow past a flat plate is given by

a.

u d t/d x + v d t/d y = µ/p c (d u/d y)² + k d² t/p c d y²

b.

u d t/d x + v d t/d y = µ/p c (d u/d y) + k d² t/p c d y²

c.

u d t/d x + v d t/d y = k d² t/p c d y² + µ/p c (d u/d y)¯²

d.

u d t/d x + v d t/d y = µ/p c (d u/d y)¯¹ + k d² t/p c d y²

Discuss
Answer: (a).u d t/d x + v d t/d y = µ/p c (d u/d y)² + k d² t/p c d y²
Q8.
The assumptions for thermal boundary layer are

(i) Steady compressible flow
(ii) Negligible body forces, viscous heating and conduction in the flow direction
(iii) Constant fluid properties evaluated at the film temperature

Identify the correct option

a.

1 and 3

b.

1, 2 and 3

c.

2 and 3

d.

1 and 2

Discuss
Answer: (c).2 and 3
Q9.
The relationship between the thermal and hydrodynamic boundary layer thickness is governed by the

a.

Peclet number

b.

Prandtl number

c.

Stanton number

d.

Fourier number

Discuss
Answer: (b).Prandtl number
Q10.
A small thermo-couple is positioned in a thermal boundary layer near a flat plate past which water flows at 30 degree Celsius and 0.15 m/s. The plate is heated to a surface temperature of 50 degree Celsius and at the location of the probe, the thickness is 15 mm. The probe is well-represented by

t โ€“ t S/t INFINITY โ€“ t S = 1.5 (y/ฮด) โ€“ 0.5 (y/ฮด)³

Determine the heat transfer coefficient

a.

33.3 W/m² K

b.

43.3 W/m² K

c.

53.3 W/m² K

d.

63.3 W/m² K

Discuss
Answer: (d).63.3 W/m² K
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