The effect of doping distilled water with MgSO₄ on the boiling flow regime and heat transfer on a vertical surface at low pressures was experimentally determined. The experiments were performed in a sealed 20 mm x 20 mm square cross section, 300 mm long vertical pipe. Two opposing walls were made of copper and the other two walls were made of polycarbonate for flow visualization. The tube was filled to 100 mm and heat was applied at the lower end of one copper wall and cooled at the upper end. The boiling dynamics on the heated copper vertical wall and the resulting two phase flow was visualized using a high speed camera for pure distilled water and 0.1 M, 0.2 M and 0.4 M concentrations of MgSO₄. The presence of MgSO₄ significantly changed the boiling dynamics, with a suppression of bubble coalescence and a promotion of nucleate boiling. The two phase flow exiting the heated section changed from slug to bubbly with the addition of the MgSO₄. There was a significant increase in the heat transfer coefficient with the addition of the MgSO₄.

通过实验确定了用 MgSO ₄掺杂蒸馏水对沸腾流态和垂直表面传热的影响。实验在密封的 20 毫米 x 20 毫米方形横截面、300 毫米长的垂直管道中进行。两个相对的壁由铜制成，另外两个壁由聚碳酸酯制成，用于流动可视化。将管填充至 100 毫米，并在一个铜壁的下端加热并在上端冷却。对于纯蒸馏水和 0.1 M、0.2 M 和 0.4 M 浓度的 MgSO ₄，使用高速相机对加热的铜垂直壁上的沸腾动力学和由此产生的两相流进行可视化。MgSO ₄的存在显着改变了沸腾动力学，抑制了气泡聚结并促进了核沸腾。随着MgSO ₄的加入，离开加热段的两相流从段塞流变为气泡流。随着MgSO ₄的加入，传热系数显着增加。