backwash是什么意思

双语用例

• Big business was especially multinational in operation; small firms were increasingly backwashed by that activity in local areas.

• Once the backwash step is formed, the flow separates a t the lower edge of the step, and another separation vortex is there induced.

• The vortex is shown in figure 4; the sawdust on the flat bed was lifted up by the backwash vortex, not by the breaker.

• The results so far described indicate that a step such as shown in figure 1 is formed due to the backwash vortex.

• Most designs typically employ backwashing once per day of operation.

• Relaxation and backwashing effectiveness will decrease with operation time as more irreversible fouling accumulates on the membrane surface.

• By contrast with the backwash effects of out-migration, there are also potential positive or ' spread ' effects that need to be taken account of.

• Reversible fouling can be removed by a strong shear force or backwashing.