Related Questions

In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
A Convection
B Radiation
C Conduction
D Both convection and conduction
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 = $$\frac{\pi }{2}$$ Gz
C Nu = $$\frac{2}{\pi }$$ Gz
D Nu = 2 Gz0.5
The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are
A Re.Gz
B Nu, Pr
C Nu, Pr, Re
D Nu, Gz
Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the
A Length of the pipe
B Diameter of the pipe
C Density of the fluid
D Velocity of the fluid
Experimental study of laminar fluid flow through a circular tube was conducted by
A Reynolds
B Hagen and Poiseuille
C Pascal
D Blake-Plummer
The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is
A Parabolic
B Flat
C Flat near the wall and parabolic in the middle
D Parabolic near the wall and flat in the middle
A Newtonion liquid (ρ = density, μ = viscosity) is flowing with velocity v in a tube of diameter 'D'. Let Δp be the pressure drop across the length 'L'. For a laminar flow, Δp is proportional to
A L ρv²/D
B L μ;V/D²
C D ρv²/L
D Μ V/L
Heat exchangers operating, when the asymptotic range is reached,
A Provide very large heat transfer co-efficient
B Results in making part of the heating surface inactive
C Results in abruptly increased velocity
D None of these
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is
A $$\frac{{\text{Q}}}{2}$$
B $$\frac{{\text{Q}}}{4}$$
C $$\frac{{\text{Q}}}{8}$$
D $$\frac{{\text{Q}}}{{16}}$$
The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonion fluid in a circular pipe is
A 0.5
B 1
C 2
D 0.66

Next steps