To clear the effects of the hydrodynamic interactions among neighboring vapor bubbles on the saturated pool boiling heat transfer, artificial nucleation sites with several cavity arrangements were manufactured on the substrate surface and measured liquid temperatures near heated substrate by a miniature thermocouple probe with 10 kHz. The surface temperature of heated substrate was measured by an infrared camera with 1 kHz and bubble dynamics were simultaneously visualized by a high-speed video camera with 5 kHz and 10 kHz, respectively. The liquid temperature fluctuations, measured with micro thermocouple 100 μm and 10 μm above the substrate surface, were compared among each other and with the transient temperature fields obtained through IR measurements. Results showed that the hydrodynamic interaction among neighboring bubbles causes the liquid convection, that was only detected 100 µm above the boiling surface. Generally, the degree of liquid temperature fluctuations at 10 μm height and different arrangements of nucleation sites was under 1 K. Here the superheated sublayer in the vicinity of the boiling surface was generally not affected by the convection. Only when the coalescence from two neighboring nucleation sites occurred and the liquid-vapor interface nearly reached the substrate, a steep temperature drop over 2 K was detected. It was concluded that the viscous sublayer stably exists during boiling of water in lower heat flux conditions. To enhance the convective heat transfer in nucleate boiling, coalesced bubble needs to peel off the viscous sublayer during its deformation. Based on the measurements in this study, this peel-off effect only happens when the coalescence point is less than 1 mm above the heated surface.

为了清除相邻蒸汽气泡之间的流体动力学相互作用对饱和池沸腾传热的影响，在基板表面制造了具有多个腔布置的人工成核位点，并通过具有 10 kHz 的微型热电偶探头测量加热基板附近的液体温度。加热基板的表面温度由 1 kHz 的红外摄像机测量，气泡动力学由分别为 5 kHz 和 10 kHz 的高速摄像机同时可视化。用微热电偶在基板表面上方 100 μm 和 10 μm 处测量的液体温度波动相互比较，并与通过红外测量获得的瞬态温度场进行比较。结果表明，相邻气泡之间的流体动力学相互作用导致液体对流，仅在沸腾表面上方 100 µm 处检测到。一般来说，10 μm高度和不同成核位点排列的液体温度波动程度在1 K以下。这里沸腾表面附近的过热亚层一般不受对流影响。只有当两个相邻的成核位点发生聚结并且液-气界面几乎到达基底时，才检测到超过 2 K 的急剧温度下降。得出的结论是，在较低热通量条件下，在水沸腾过程中，粘性亚层稳定存在。为了增强核沸腾中的对流传热，聚结的气泡需要在其变形过程中剥离粘性子层。