FIGURE 2 3D model of internals with (A) one-baffle, (B)
Three-baffle, and (C) Four-baffle; (D) 3D printed internals based on 3D
model
2.2 Image and Data
Processing
All images were analyzed by Image J (version: 1.8.0) to determine the
size and quantity of bubbles. The evaluation of the performance of the
CMGD was based on the average diameter (d av) of
bubbles. The bubble diameter was measured by the following steps: (1)
setting scale, (2) selecting measurement area (15×15 mm), (3)
calculating the equivalent diameter of bubbles. As shown in Figure 3A,
the marked 4 chord lengths pass through the center of mass of the bubble
as far as possible, and the final equivalent diameter of the bubble is
the average of all chord lengths.27 The
diameter(di ) of a single bubble is obtained by
the above method, and the dav of bubbles was
calculated by eq (1):
\begin{equation}
d_{\text{av}}=\frac{1}{n}\sum_{i=1}^{n}d_{i}\ \ (n>300)\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (1)\nonumber \\
\end{equation}