Experimental study of bubble behaviors and CHF on printed circuit board (PCB) in saturated pool water at various inclination angles

Experiments were performed to investigate bubble behaviors and pool boiling Critical Heat Flux (CHF) on a thin flat rectangular copper heater fabricated on Printed Circuit Board (PCB), at various inclination angles. The surface inclination angles were 0°, 45°, 90°, 135°, and 180°. Results showed the Onset of Nucleate Boiling (ONB) heat flux increased with increasing heater orientation from 0° to 90°, while early ONB occurred when the heater...