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Hydrodynamic-and-Thermal-Boundary-Layers

1. The zone or thin layer wherein temperature field exists is called


Hint Answer

2. A flat plate 1 m by 1 m is placed in a wind tunnel. The velocity and temperature of free stream air are 80 m/s and 10 degree Celsius. The flow over whole length of plate is made turbulent by turbulizing grid placed upstream of plate. Find heat flow from surface of plate


Hint Answer

3. Consider above problem, find temperature of bottom surface of plate for steady state condition


Hint Answer

4. Ambient air at 20 degree Celsius flows past a flat plate with a sharp leading edge at 3 m/s. The plate is heated uniformly throughout its entire length and is maintained at a surface temperature of 40 degree Celsius. Calculate thickness of rmal boundary layer. Assume that transition occurs at a critical Reynolds number of 500000


Hint Answer

5. The differential energy equation for flow past a flat plate is given by


Hint Answer

6. The average drag coefficient for turbulent boundary layer flow past a thin plate is given by
C f = 0.455/ (log 10 R el) 2.58
Where R el is Reynolds number based on plate length. A plate 50 cm wide and 5 m long is kept parallel to flow of water with free stream velocity 3 m/s. Calculate drag force on both sides of plate. For water, kinematic viscosity = 0.01 stokes


Hint Answer

7. Atmospheric air at 30 degree Celsius temperature and free stream velocity of 2.5 m/s flows along length of a flat plate maintained at a uniform surface temperature of 90 degree Celsius. Let length = 100 cm, width = 50 cm and thickness = 2.5 cm. Thermal conductivity of plate material is 25 W/m K, find heat lost by plate


Hint Answer

8. The convection of energy reduces outward conduction in fluid so temperature gradient


Hint Answer

9. With respect to above problem, find value of Nusselt number


Hint Answer

10. Reynolds analogy is given by


Hint Answer

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This Chapter Hydrodynamic-and-Thermal-Boundary-Layers consists of the following topics

Hydrodynamic and Thermal Boundary Layers

The zone or thin layer wherein temperature field exists is called

;

A flat plate 1 m by 1 m is placed in a wind tunnel. The velocity and temperature of free stream air are 80 m/s and 10 degree Celsius. The flow over whole length of plate is made turbulent by turbulizing grid placed upstream of plate. Find heat flow from surface of plate

;

Consider above problem, find temperature of bottom surface of plate for steady state condition

;

Ambient air at 20 degree Celsius flows past a flat plate with a sharp leading edge at 3 m/s. The plate is heated uniformly throughout its entire length and is maintained at a surface temperature of 40 degree Celsius. Calculate thickness of rmal boundary layer. Assume that transition occurs at a critical Reynolds number of 500000

;

The differential energy equation for flow past a flat plate is given by

;

The average drag coefficient for turbulent boundary layer flow past a thin plate is given by
C f = 0.455/ (log 10 R el) 2.58
Where R el is Reynolds number based on plate length. A plate 50 cm wide and 5 m long is kept parallel to flow of water with free stream velocity 3 m/s. Calculate drag force on both sides of plate. For water, kinematic viscosity = 0.01 stokes

;

Atmospheric air at 30 degree Celsius temperature and free stream velocity of 2.5 m/s flows along length of a flat plate maintained at a uniform surface temperature of 90 degree Celsius. Let length = 100 cm, width = 50 cm and thickness = 2.5 cm. Thermal conductivity of plate material is 25 W/m K, find heat lost by plate

;

The convection of energy reduces outward conduction in fluid so temperature gradient

;

With respect to above problem, find value of Nusselt number

;

Reynolds analogy is given by

;