Home

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

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to
  2. The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is
  3. Metals are good conductors of heat because
  4. A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two…
  5. Thermal conductivity of a material may be defined as the
  6. The unit of overall coefficient of heat transfer is
  7. The unit of Stefan Boltzmann constant is
  8. In case of liquids and gases, the heat transfer takes place according to
  9. Thermal diffusivity of a substance is
  10. The heat is transferred by conduction, convection and radiation in
  11. Absorptivity of a body will be equal to its emissivity
  12. The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer…
  13. Fourier's law of heat conduction gives the heat flow for
  14. Reynolds number is the ratio of
  15. The ratio of surface convection resistance to the internal conduction resistance is known as
  16. The product of Reynolds number and Prandtl number is known as
  17. The process of heat transfer from one particle of the fluid to another by the actual movement of the…
  18. Log mean temperature difference in case of counter flow compared to parallel flow will be
  19. Thermal conductivity of water ________ with rise in temperature.
  20. Unit of thermal conductivity in S.I. units is
  21. Stefan Boltzmann law is applicable for heat transfer by
  22. According to Stefan's law, the total radiation from a black body per second per unit area is proportional…
  23. Total emissivity of polished silver compared to black body is
  24. If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ,…
  25. The critical radius is the insulation radius at which the resistance to heat flow is
  26. A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities.…
  27. Wiens law states that the wave length corresponding to ________ is proportional to the absolute temperature.
  28. Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly…
  29. In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in
  30. Emissivity of a white polished body in comparison to a black body is