Test: Boiling - Mechanical Engineering MCQ

Boiling is a convective heat transfer process that is associated with change in the phase of a fluid.

Boiling constitutes the convective heat transfer process that involves a phase change from liquid to vapor state.

Greater importance has recently been given to the boiling heat transfer.

The liquid above the hot surface is essentially stagnant and the only motion near the surface is because of free convection.

The liquid is pumped and forced across the surface in a controlled manner.

The vapor bubbles travel a short path and then vanish, apparently they condense in the bulk of the liquid which is at a temperature less than the boiling point.

The vapor bubbles generated at the solid surface are transported through the liquid by buoyancy effects and eventually escape from the surface.

This is the region of stable film boiling.

The burnout point on the boiling curve represents the point of maximum heat flux at which transition occurs from nucleate to film boiling.

Pool, forced convection, subcooled and saturated boiling.