The basic elements of a new experimental approach for the investigation of burnout in pool boiling are presented. The approach consists of the combined use of ultrathin (nano-scale) heaters and high speed infrared imaging of the heater temperature pattern as a whole, in conjunction with highly detailed control and characterization of heater morphology at the nano and micron scales. It is shown that the burnout phenomenon can be resolved in both space and time. Ultrathin heaters capable of dissipating power levels, at steady-state, of over 1 MW/m2 are demonstrated. A separation of scales is identified and it is used to transfer the focus of attention from the complexity of the two-phase mixing layer in the vicinity of the heater to a micron-scaled microlayer and nucleation and associated film-disruption processes within it.
T. C. Theofanous, J. P. Tu, T.N. Dinh, The Physics of Boiling at Burnout, The International Conference on Multiphase Systems, ICMS, Ufa, RUSSIA, June 15-17, 2000.
The basic elements of a new experimental approach for the investigation of
burnout in pool boiling are presented. The approach consists of the combined use
of ultrathin (nano-scale) heaters and high speed infrared imaging of the heater
temperature pattern as a whole, in conjunction with highly detailed control and
characterization of heater morphology at the nano and micron scales. It is shown
that the burnout phenomenon can be resolved in both space and time. Ultrathin
heaters capable of dissipating power levels, at steady-state, of over 1 MW/m2
are demonstrated. A separation of scales is identified and it is used to
transfer the focus of attention from the complexity of the two-phase mixing
layer in the vicinity of the heater to a micron-scaled microlayer and nucleation
and associated film disruption processes within it.
Theofanous, T.G., Tu, J.P., Dinh, T.N., Salmassi, T., Dinh, A.T., Gasljevic, K., The Physics of Boiling at Burnout, Fifth Microgravity Fluid Physics and Transport Phenomena Conference, NASA Glenn Research Center, Cleveland, OH, CP-2000-210470, pp. 486-526, August 9, 2000.