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Erschienen in:
2011 | OriginalPaper | Buchkapitel
Thermal Actuators
verfasst von : Prof. Dr. rer. nat. Werner Karl Schomburg
Erschienen in: Introduction to Microsystem Design
Verlag: Springer Berlin Heidelberg
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Abstract
If the linear dimensions of a device are reduced, its mass decreases with the third power, while its surface decreases only proportional to the square (cf. page 3). As a consequence, the ratio of surface to volume or mass is very large for microdevices. This means, that a microdevice is heated up much more quickly and with less energy consumption, because of its small mass, and is cooling down more quickly due to its large surface to mass ratio. Therefore, heating up is a suitable actuation principle for a lot of microdevices, while it is not a good solution for macroscopic devices. The ink-jet printer is a good example (cf. page 251).