Coupling Onset of Cyclone Upward and Rotation Flows in a Little Bottle

TL;DR

This paper experimentally and theoretically demonstrates how the coupling of rotational and upward flows in a small bottle can lead to cyclone formation, highlighting the importance of rotation gradients in this process.

Contribution

It introduces a novel experimental setup and theoretical explanation for cyclone onset driven by rotation gradients in a confined fluid system.

Findings

Rotation gradient is crucial for cyclone coupling.

Upward flow is enhanced by centrifugal pressure increase.

Experimental and theoretical analysis confirms the coupling mechanism.

Abstract

A coupling onset of the cyclone upward and rotation flows is experimentally demonstrated in a little bottle. The rotating flow provides a pressure increase in the outer part of the rotating flow by its centrifugal force. When a gradient of the fluid rotation appears along the rotation axis, the higher-pressure area is localized and pushes the fluid in a low pressure. Then the fluid staying in the central area of the rotation is pushed up along the rotation axis, and the upward wind is enhanced. In this coupling mechanism the rotation gradient is the key; the coupling of the rotation and the upward fluid flow is essentially important for a cyclone buildup, and is well explained experimentally and theoretically.