Which of the following is unimportant in forced convection ?

Related Mcqs:

For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is______________?

A. Nu = 0.023 Re0.8. Pr0.4 B. Nu = (π/2) Gz C. Nu = (2/π) Gz D. Nu = 2Gz0.5...

Tube expansion allowances exist in _____________ heat exchanger?

A. Multipass fixed tube sheet B. U-tube C. Single pass fixed tube sheet D. None of these...

For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it________________?

A. Occupies smaller space B. Is more economical C. Is easy to operate and maintain D. All A., B. and C....

Finned tube heat exchangers__________________?

A. Give larger area per tube B. Use metal fins of low thermal conductivity C. Facilitate very large temperature drop through tube wall D. Are used for smaller heat load...

The units of resistance to heat transfer is _____________________?

A. J.m-2.K-1 B. J.m-1.K-1 C. W.m-2.K-1 D. W-1m2K...