Which of the following non-dimensional numbers is used for transition from laminar flow to turbulent flow in the free convection?
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Which non-dimensional numbers relates the thermal boundary layer and hydrodynamic boundary layer?
The laminar boundary layer occurs when a cold fluid over a hot plate. In which of the following positions, the temperature gradient assumes zero value?
The characteristic length for computing Grashoff number of horizontal cylinder is ___________
In laminar developing flow through a pipe with constant wall temperature, the magnitude of the pipe wall inner surface convective heat transfer coefficient shall be maximum at the:
For a fluid with Prandtl number Pr>1, momentum boundary layer thickness?
Water (Prandtl number ?6) flows over a flat plate which is heated over the entire length. Which one of the following relationship between the hydrodynamic boundary layer thickness (?) and the thermal boundary layer thickness (?)t is true?
What is the equivalent emissivity for radiant heat exchange between a small body (emissivity = 0.4) in a very large enclosure (emissivity = 0.5)?
If a body is at 2000K, the wavelength at which the body emits maximum amount of radiation is __________
Which of the following parameter is not responsible for loss of heat from a hot surface in room?
Hot coffee in a cup is allowed to cool. Its cooling rate is measured and found to be greater than the value calculated by conduction, convection and radiation measurement. The difference is due to: