THE EFFECTS OF HEATING METHODS ON POOL BOILING

Saturation pool boiling is studied analytically and experimentally using a 0.5 mm tungsten wire in methanol under atmospheric pressure. Under constant voltage heating, transition boiling is an 'unsteady' two mode boiling which may be followed by a 'steady' two mode boiling. The locus of 'steady' two mode boiling is the equilibrium line which divides the nucleate and film boiling curves into stable and metastable sections. Along this line, the electric current is constant and the lever arm rule applies. Under constant current heating, transition boiling is 'unsteady' two mode boiling which changes faster as the current differs more from the equilibrium line current.