Wherein, recent years, hydrocyclones have been witnessed a rising worldwide popularity owing to their irreplaceable merits in solid-li- quid, gas-liquid, liquid-liquid, gas-liquid-solid, gas-liquid-liquid, and solid-liquid-liquid separation, such as small cut sizes (≥ 2 μm, even submicron), high separation efficiency, low en- ergy consumption, no moving parts, wide operating range, low cost, and small volume. Specifically, to date, hydrocyclones have been widely employed in industries, such as mineral, chemical, coal, petroleum, papermaking, environ- mental protection, soil remediation, waste manage- ment, agriculture, aquaculture, food , bio- technology, nanotechnology, material science technology , and thermal energy. Therefore, to optimize the separation performance and further expand the application scope of hydro- cyclones, a great deal of previous research into hydrocyclones have been conducted to develop novel enhanced-separation hydrocyclone technologies.