When vaporisation takes place directly at the heating surface, it is called

Related MCQs

• When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.
• An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a
• In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.
• It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is
• Rate of heat transfer by vaporisation from pools of water is affected by the
• The actual temperature drop across the heating surface of an evaporator depends on the
• The actual temperature drop across the heating surface in an evaporator depends on the
• Heat transfer takes place as per –
• Heat transfer in liquid and gases takes place by
• 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