| Popis: |
In most cases, the so-called boiling curve is used to describe the time- and spatially-averaged characteristics of pool-boiling heat transfer. Usually the boiling curves have the following three characteristic points: the incipience of nucleate boiling, the critical heat flux (CHF), and the minimum heat flux (MHF) points. If the contribution of liquid-solid contact can be neglected, heat transfer in the film boiling region is the same as the film boiling mode. Analytical models. Hsu and Westwater reported experimental results in which the liquid-vapor interface exhibited wave motion in saturated film boiling on a long vertical surface. They assumed that such wave motion resulted from transition of the laminar to turbulent vapor flow, and they developed a heat transfer model taking into account the turbulent vapor flow. Film boiling on horizontal flat plate and inclined surfaces. The liquid-vapor interface exhibits wave motion in the case of film boiling on horizontal flat plates due to the Rayleigh-Taylor instability. |
