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Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?
Related MCQs
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because__________?
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Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?
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What is the geometric mean of two heat transfer areas A1 and A2 ?
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Which has the lowest Prandtl number ?
In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is__________?
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‘Duhring’s plot’ is of use in__________?
View factor is important in heat transfer by__________?
Forced circulation evaporators are normally used for concentrating liquids having __________?
The equation, Nst = f/2, is the __________ analogy?
Which of the following is directly concerned with the heat transfer ?
The thermal boundary layer at NPr > 1 ?
Nucleate boiling is promoted __________?
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m2.K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m2.K. The overall heat transfer co-efficient at this time is __________?
Cpμ/K is termed as the __________ number?
In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator?
In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is __________?
Maximum heat transfer rate is obtained in __________ flow?
Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.) ?
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Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid __________?
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A multiple effect evaporator as compared to a single effect evaporator of the same capacity has __________?
Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling ?
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In a forward feed multiple effect evaporator, the pressure is __________?
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The non-dimensional temperature gradient in a liquid at the wall of a pipe is the __________?
The film co-efficient between condensing vapour and metal wall increases with __________?
With increase in temperature, the thermal conductivity of most liquids__________?
In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger ?
The driving potential for the crystal growth during crystallisation is the __________ of the solution?
Heat flux, as defined in heat flow is analogous to __________ in electricity flow?
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Correct Answer:
0.6
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Last Updated:
March 03, 2019