At Pr >1, conduction in an ordinary fluid flowing through a heated pipe...

Q.

At Pr >1, conduction in an ordinary fluid flowing through a heated pipe is limited to the

A. buffer zone

B. turbulent core

C. both (a) and (b)

D. viscous sub-layer

Answer & Explanation

Answer : Option: D

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Q.

Heat transfer co-efficient (h1) for liquids increases with

A. increasing temperature

B. decreasing temperature

C. decreasing Reynolds number

D. none of these

Answer & Explanation

Q.

h.D/K is called the _______ number.

A. Nusselt

B. Peclet

C. Rayleigh

D. Grashoff

Answer & Explanation

Q.

Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

A. 32

B. 37

C. 45

D. 50

Answer & Explanation

Q.

A pipe of diameter 10 cm is maintained at 170°C and exposed to air at 30°C. The length of the pipe is 2 m and it is kept horizontal. Find out the heat lost by the pipe per hour.

A. 705 W

B. 710 W

C. 715 W

D. 703 W

Answer & Explanation

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At Pr >1, conduction in an ordinary fluid flowing through a heated pipe...

Q. At Pr >1, conduction in an ordinary fluid flowing through a heated pipe is limited to the

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More Questions Heat and Mass Transfer:

Q. Heat transfer co-efficient (h1) for liquids increases with

Q. h.D/K is called the _______ number.

Q. Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

Q. A pipe of diameter 10 cm is maintained at 170°C and exposed to air at 30°C. The length of the pipe is 2 m and it is kept horizontal. Find out the heat lost by the pipe per hour.

Q.

At Pr >1, conduction in an ordinary fluid flowing through a heated pipe is limited to the

Q.

Heat transfer co-efficient (h1) for liquids increases with

Q.

h.D/K is called the _______ number.

Q.

Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

Q.

A pipe of diameter 10 cm is maintained at 170°C and exposed to air at 30°C. The length of the pipe is 2 m and it is kept horizontal. Find out the heat lost by the pipe per hour.