A. Von-Karman
B. Reynolds
C. Colburn
D. Prandtl
Related Mcqs:
- The equation, Nst = f/2, is the _____________ analogy?
A. Colburn
B. Reynolds
C. Prandtl
D. None of these - The equation, (NSt × N2/3 Pr) = f/2, is the ____________ analogy ?
A. Colburn
B. Reynolds
C. Prandtl
D. None of these - The thermal boundary layer at NPr > 1 ?
A. Is thicker than hydrodynamic boundary layer
B. Is thinner than hydrodynamic boundary layer
C. And the hydrodynamic boundary layers are identical
D. Disappears - In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of___________________?
A. Concentrations
B. Chemical potentials
C. Activity co-efficients
D. Mass transfer co-efficients - Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid ___________________?
A. For fluids in laminar flow
B. For fluids in turbulent flow
C. When Grashoff number is very important
D. For liquid metals - Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re 0.8. Pr n, is not valid, if the value of __________________?
A. n = 0.4 is used for heating
B. n = 0.3 is used for cooling
C. Reynolds number for the flow involved is > 10000
D. Reynolds number for the flow involved is < 2100 - The Dittus-Boelter equation for convective heat transfer [(i.e. h = 0.023 (K/D) (Re)0.8 (Pr)0.4] cannot be used for________________?
A. Low Reynold’s number
B. Very low Grashoff number
C. Molten metals
D. All A., B. and C. - Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_____________________?
A. Prandtl number
B. Grashoff number
C. Thermal conductivity
D. Viscosity - _____________ equation relates the thermal conductivity of a solid to its temperature ?
A. Antoine
B. Kopp’s
C. Lee’s
D. Kistyakowsky - Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?
A. Dittus-Boelter equation
B. Sieder-Tate equation
C. Nusselt equation
D. None of these
