Peng, X. F.X. F.PengHuang, Y. J.Y. J.HuangLee, D. J.D. J.Lee2008-12-102018-06-282008-12-102018-06-28200112900729http://ntur.lib.ntu.edu.tw//handle/246246/90099https://www.scopus.com/inward/record.uri?eid=2-s2.0-0035486002&doi=10.1016%2fS1290-0729%2801%2901266-2&partnerID=40&md5=91a3ddaea04496476625f4b4f06f8bf5The boiling characteristics of subcooled liquids on a heating surface facing downward were investigated experimentally. A jet flow observed to emerge from the bubble top was induced by interfacial evaporation and condensation rather than by natural convection due to buoyancy or by Marangoni flow due to surface tension gradients according to the work of Christopher et al. [14, 15]. The jet flow greatly enhanced the nucleate boiling heat transfer efficiency and is probably one of the most important intrinsic mechanisms in nucleate boiling. The heating surface temperature changes as the jet flow formed and dissipated in an oscillatory manner. The development of the thermal boundary layer and the surface temperature were also depressed by the jet flow. The liquid subcooling markedly affected the strength of the jet flow. The visual observations also indicated the existence of three different heat transfer modes at different heating levels: the single-phase liquid heat transfer mode governed by heat conduction with increasing thermal boundary layer thickness as the heat flux increased; the jet-flow boiling mode which is characterized by that the thermal boundary layer thickness is independent of the applied heat flux; and the fully-developed nucleate boiling mode. © 2001 Éditions scientifiques et médicales Elsevier SAS.application/pdf392410 bytesapplication/pdfen-USBoiling; Bubble; Heat transfer; Jet flow; Phase change; Thermal boundary layerjournal article10.1016/S1290-0729(01)01266-22-s2.0-0035486002http://ntur.lib.ntu.edu.tw/bitstream/246246/90099/1/25.pdf