摘要
An experimental investigation was performed on Marangoni effect of cracked liquid film of aqueous Na_2SO_4 flowing over a vertical heated plate by using a sensitive infrared imaging technique. The results show that the thermal and solutal Marangoni effects, which result from the non-uniform distributions of surface temperature and concentration of the film, respectively, occur in the streamwise and transverse directions of the film, generating different influences on the film heat transfer. Taking account of the Marangoni number (Ma) and the solution concentration (c_0), a correlation of the Nusselt number (Nu) for the cracked liquid film is proposed.
An experimental investigation was performed on Marangoni effect of cracked liquid film of aqueous Na2SO4 flowing over a vertical heated plate by using a sensitive infrared imaging technique. The results show that the thermal and solutal Marangoni effects, which result from the non-uniform distributions of surface temperature and concentration of the film, respectively, occur in the streamwise and transverse directions of the film, generating different influences on the film heat transfer. Taking account of the Marangoni number （Ma） and the solution concentration （Co）, a correlation of the Nusselt number （Nu） for the cracked liquid film is proposed.
基金
Supported by the National Natural Science Foundation of China (Grant No. 20576050)
关键词
水电解质
硅化钠
红外线成像技术
热转移
aqueous electrolyte, Na2SO4, Marangoni effect, cracked falling film, infrared imaging technique, heat transfer
