Mems bubble generator for large stable vapor bubbles

B - Operations – Transporting – 81 – B

Patent

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Details

B81B 7/02 (2006.01) B41J 2/05 (2006.01)

Patent

CA 2662725

A MEMS vapour bubble generator that uses a heater in thermal contact with a liquid to generate a bubble. The heater is energized by an electrical pulse that is shaped to have a relatively low power, sub-nucleating portion and a high power portion that nucleates the bubble. The thermal energy transferred to the liquid by the sub-nucleating portion speeds up the nucleation of the bubble across the surface of the heater during the nucleating portion. This produces larger, more stable bubble having a regular shape.

La présente invention concerne un générateur de bulles de vapeur en technologie MEMS utilisant un chauffage en contact thermique avec un liquide pour produire une bulle. Le chauffage est alimenté par une impulsion électrique dont la forme est conçue pour présenter une partie de sous-nucléation de puissance relativement basse et une partie haute puissance qui provoque la bulle par nucléation. L'énergie thermique transférée au liquide par la partie de sous-nucléation accélère la nucléation de la bulle sur toute la surface du chauffage pendant la partie de nucléation. Cela produit une bulle plus grande et plus stable, de forme régulière.

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