*2.1. Jujube Branches Model*

The jujube branch samples were taken from the jujube garden of the 11th regiment of Alar city, the first division of Tarim, Xinjiang. The cultivation mode was dwarfing culture and compact planting, and the tree was 1 year old, as shown in Figure 1a. The projection method was used to obtain three-dimensional coordinates of critical nodes of the jujube branch, and then the curvature and length of each jujube branch were measured. After modeling, the jujube branch model was produced, as shown in Figure 1b.

**Figure 1.** Jujube branch model. (**a**) Physical map of jujube branches to be picked. (**b**) Single jujube branch numerical model.

To study the effect of particle size on flow, the selected jujube branches were statistically analyzed to determine the value range of jujube branch size. Test design factors were defined based on the X-direction size of the jujube branch, and the three-level design value of the experiment was determined at the same time. Combined with the randomness principle of the orthogonal experiment, three jujube branch sizes were defined as size I, size II, and size III. The specific jujube branch sizes are shown in Table 1. This physical model does not have the characteristics of spherical particles and can be regarded as a complex supernormal particle.

**Table 1.** Sizes and parameters of jujube branch.

