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采用高精度红外热像仪,实验研究了电解质Na2SO4-H2O溶液受热破裂降膜的Marangoni效应.结果表明,降膜的流向和径向都存在分别由液膜表面温度和浓度分布不均引发的热和溶质Marangoni效应,并对降膜的传热过程产生了不同的影响.引入Marangoni数(Ma)和溶液浓度(c0)参数,提出了受热破裂降膜Nusselt数(Nu)的关联式.
The Marangoni effect of electrolyzing Na2SO4-H2O solution by heating was investigated experimentally by high-precision infrared thermal imager.The results show that there are two kinds of thermal effects in the flow direction and the radial direction of the falling film, which are caused by the uneven distribution of surface temperature and concentration And Marangoni effect of solute, and have different effects on the heat transfer process of the falling film.According to Marangoni number (Ma) and solution concentration (c0) parameters, the correlation of Nusselt number (Nu)