Micro heat exchangers, Micro-scale heat exchangers, or microstructured heat exchangers are heat exchangers in which (at least one) fluid flows in lateral confinements with typical dimensions below 1 mm. The most typical such confinement are microchannels, which are channels with a hydraulic diameter below 1 mm. Microchannel heat exchangers can be made from metal or ceramic. Microchannel heat exchangers can be used for many applications including: * high-performance aircraft gas turbine engines * heat pumps * Microprocessor and microchip cooling * air conditioning