Question

When boiling a saturated liquid, there is a characteristic regime where the heat flux reduces despite increase in the temperature of the heating element. This unique characteristic is attributed to:

A. convection boiling
B. Weissenberg effect
C. thermal radiation
D.film boiling
E. nucleation boiling

Answer 1

The characteristic regime where heat flux reduces during boiling, despite an increase in the temperature of the heating element, is attributed to film boiling.

Step-by-step explanation:

When boiling a saturated liquid leads to a reduction in heat flux despite an increase in the temperature of the heating element, this unique characteristic is attributed to film boiling. In film boiling, a layer of insulating vapor forms between the liquid and the heat source. This vapor layer reduces the efficiency of heat transfer, as it possesses lower thermal conductivity compared to the liquid, causing the heat flux to decrease even as the heating element's temperature increases.