Abstract
We examine the simple method for generating a liquid jet. We drop a liquid filled test tube on the rigid floor, leading to the emergence of a jet. Within certain experimental conditions, the jet velocity in our experiment agrees well with the semiempirical relation proposed in previous researches. In other conditions, we find that the jet velocity remarkably increases. In order to understand the jet velocity increment, we categorize jets into three types based on their shape and the existence of cavitation bubbles. We find that a jet with cavitation is much faster than that without cavitation bubbles. For elucidating the mechanism of jet velocity increment, we discuss the effect of pressure wave, which propagates in a liquid bath. We propose a model for describing these phenomena and verify it experimentally.
