There are many domestic applications where a small amount of liquid needs to be applied to a defined small area under strict conditions. In some cases, the sprayed materials are toxic and expensive, and excessive spray will lead to potential damage to other materials and harm to human beings. A controlled micro atomizer is designed by integrating an electronic and mechanical system with adjustable capability to tune the volume. The geometrical dimension of the atomizer is optimized to deliver a right amount of liquid to a predetermined area. To study the influence of atomizer design and air velocity, the sprays issuing from different atomizers of various dimensions are investigated theoretically and computationally under various external flow conditions. It is found that a controlled atomizer can be developed by optimizing the nozzle design.

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