汽塞、水塞和气塞从原理上来说,本节所述的汽塞、水塞和气塞现象都属于多值性的范畴,现一一分述如下: 1.汽塞在一个由两根或多根上升——下降流管子(或管系)组成的系统中,如果管子的上部受热而产生蒸汽,蒸汽在下降流过程中会使下降段的重位压差减小,这相当于产生一个阻力。实际上两根(或多根)管子在下降段中 In principle, the phenomena of air plugs, water plugs and air plugs described in this section fall into the categories of multiplicity. In systems with multiple ascending-descending flow tubes (or piping), if the upper part of the tube is heated to generate steam, the steam will reduce the repositioning pressure difference at the descending section during the descending flow, which is equivalent to producing a resistance. In fact, two (or more) pipes are in the descending section