Microfluid apparatus for e.g. MEMS applications, comprises gas bubble holder, ultrasound transducer and passive flow element inside liquid vessel

Abstract of NL1026321C The apparatus comprises a gas bubble holder, an ultrasound transducer for generating periodic oscillations in the liquid a passive flow element (2-2'') located inside the liquid vessel. - An apparatus for generating a streaming flow of liquid inside a vessel comprises a vessel for the liquid, a gas bubble holder located in a gas bubble region of the vessel, an ultrasound transducer for generating periodic oscillations in the liquid in order to make the gas bubble (1, 1') shape oscillate and one or more passive flow elements next to the gas bubble region for generating a flow of liquid from the gas bubble in the direction of and past the flow element. Independent claims are also included for the following: - (A) Second apparatus for generating a streaming flow of liquid, comprising a vessel for the liquid, a gas bubble holder located in a slanting gas bubble region of the vessel so that the bubble is held in a slanting position and an ultrasound transducer for generating periodic oscillations in the liquid in order to make the gas bubble shape oscillate, in which the slanting region slopes downwards in the downstream direction; - (B) First method for generating a streaming flow of liquid using the first apparatus; and - (C) Second method for generating a streaming flow of liquid using the second apparatus, in which the liquid flows from the upper part to the lower part of the gas bubble region