“粒子数增加的”可以翻译为“with an increase in the number of particles” 或者 “characterized by an increase in particle count” 。
例句：
This process leads to a situation with an increase in the number of particles.（这一过程导致了粒子数增加的情况。）
The experimental results show a phenomenon characterized by an increase in particle count.（实验结果显示了一种粒子数增加的现象。）