In this study we conduct an experiment to investigate the possible pool boiling heat transfer enhancement of FC-72 by placing movable ceramic particles on the boiling surface. The effects of the particle diameter, sort of particles (zirconia and silicon nitride) and particle number on the boiling heat transfer enhancement have been examined in detail. The major results obtained from this investigation can be summarized as follows.
(1) The boiling heat transfer enhancement is closely related to the particle diameter, sort of particles, particle number, and heat flux applied.
(2) The boiling and single phase heat transfer can be significantly enhanced by placing movable particles on the heated plate at low heat flux in single-phase flow and medium to high heat fluxes in boiling flow. Due to lower density of the ceramic particles, they are greatly agitated on the heated plate by the flow even at low heat flux applied. At medium to high heat flux, violent interaction between the particles and boiling flow causes substantial augmentation in boiling heat transfer. For the zirconia particles the boiling heat transfer can be enhanced up to 550% for a suitable choice of the experimental parameters. The best boiling heat transfer enhancement is slightly higher for the silicon nitride particles at 560%.
Even for the particle number in the flow well exceeding the enhancement in the boiling heat transfer can be rather significant. Moreover, the wall superheat for the boiling incipience can be substantially reduced by the moving ceramic particles. This result is conjectured to be the consequence of that placing the particles on the heated plate has the effect of enhancing the roughness of the plate.
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(3) At high heat flux (wall superheat) placing the particles in the flow can substantially retard the boiling heat transfer especially for the large particles. The boiling heat transfer retardation can be up to 40% for the large zirconia particles and 10% for the large silicon nitride particles.
(4) Interactions between the particles and bubbles are already very strong at low and medium heat fluxes for the small silicon nitride particles placed on the heated surface and hence the boiling heat transfer enhancement is already very pronounced at small particle numbers. Even at a somewhat high heat flux the retardation of the boiling heat transfer is barely seen.
(5) The pool boiling heat transfer enhancement for lighter ceramic particles is always better than heavier metallic particles at any level of heat flux applied.
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