| 摘要 |
Foam is generated by introducing (14) a mixture of gas and a liquid into a vessel (12) to pass through a passage (30) in the vessel. The flow of the mixture through the passage is increased to increase the velocity of the mixture and cause corresponding shearing forces on the mixture to create a turbulence and form foam from the mixture. A restrictor (22) can be moved in the passage to vary the amount of restriction and, therefore, the amount of the foam. <IMAGE>
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