具有反向浮力的射流
Jets with Reversing Buoyancy
摘要：
在时间$t=0$处，将重质流体的射流向上注入到较轻的流体中，并且在时间$t=t_i$处达到最大高度，然后围绕向上的流回。将轻质流体向下注入到重质流体中，也会出现类似的流动情况。本文导出了$t_i$的精确解析表达式。该表达式仍然适用于层流和湍流浮力射流有或无旋流。
英文摘要：
A jet of heavy fluid is injected upwards, at time $t=0$, into a lighter fluid and reaches a maximum height at time $t=t_i$ and then flows back around the upward flow. A similar flow situation occurs for a light fluid injected downward into a heavy one. In this paper an exact analytical expression for $t_i$ is derived. The expression remains valid for laminar and turbulent buoyant jets with or without swirl.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
