MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Solution of BLE for Internal Flows

A fluid of th...

Question

A fluid of thermal conductivity 5 W/mK is flowing in a pipe of diameter 20 cm with a Reynolds number of 1500. The pipe is maintained at constant wall temperature. What will be the convective heat transfer coefficient ( $W / m^{2} K$ ) ?

A

91.5

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

B

5.78

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

4.36

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

3.66

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A 91.5
Since, Re < 2300 i.e. flow is laminar in pipe for laminar flow in a pipe with constant wall temperature.
$N u = 3.66$
also $N u = \frac{h D}{k}, h = \frac{N u k}{D} = \frac{3.66 \times 5}{0.2} = 91.5 W / m^{2} K$

Suggest Corrections

thumbs-up

0

Similar questions

Q. Air flows through a 10cm diameter tube at Reynolds number 1700 with thermal conductivity of air as 0.2792 W/mK and constant heat flux condition is maintained with a temperature of pipe is

50^{o} C

above air temp all along the length. The heat transfer transfer per unit length is

Q. A furnace has a wall of 20 cm thickness with thermal conductivity k = 2 W/mK. An insulation of 3 cm is applied which has thermal conductivity of 0.008 W/mK. On the left side of the wall there is flue gas at a temperature of

700^{\circ} C

with convective heat transfer coefficient 100

W / m^{2} K

. Outside temperature of the insulation is

25^{\circ} C

. Intermediate temperature is

Q. A coolant fluid at

30^{\circ}

C flows over a heated flat plate maintained at a constant temperature of

100^{\circ}

C. The boundary layer temperature distribution at a given location on the plate may be approximated as T= 30+70 exp(-y) where y (in m) is the distance normal to the plate and T is in

^{\circ}

C. If thermal conductivity of the fluid is 1.0 W/mK, the local convective heat transfer coefficient (in

W / m^{2} k

) at the location will be

Q. When the heat transfer taking place by convection from a verticle plate of length 0.609 m height to a fluid, having a temp of 30C, and thermal conductivity of

33 \times 10^{- 3}

W/mK, plate K = 22.1 W/mk with a Nusselt number of 79. The heat transfer coefficient

W / m^{2} K

Q. A pipe of 25 mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5

W / m^{2} K

. It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05 W/mK. Which one of the following statements is TRUE?

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Solution of BLE for Internal Flows

OTHER

Watch in App

explore_more_icon

Explore more

Solution of BLE for Internal Flows

Join BYJU'S Learning Program

CrossIcon