Devices with extended area structures for mass transfer processing of fluids

A method, comprising:

• operating a device including a number of mass transfer microchannels, a plurality of thermally conductive fins, a first heat transfer channel with a boundary defined by a first thermally conductive wall, and a second heat transfer channel with a boundary defined by a second thermally conductive wall, the fins each being connected to the first wall and the second wall to transfer heat by conduction and the fins extending therebetween to separate the mass transfer microchannels from one another;
• providing a fluid media to the microchannels;
• performing a mass transfer process with the fluid media in each of the microchannels between the fins;
• and flowing a heat transfer fluid through the first heat transfer channel and the second heat transfer channel to regulate temperature of the mass transfer process.

A method, comprising:

• operating a device including a number of mass transfer microchannels, a heat transfer channel with a boundary defined by a thermally conductive wall, and a plurality of thermally conductive fins connected to the wall, the fins each corresponding to a mass transfer surface area along a respective one of the mass transfer microchannels;
• providing a fluid media through each of the mass transfer microchannels;
• transferring one or more components of one of a liquid and a gas to another of the liquid and the gas by performing a mass transfer process at a liquid-gas interface in each of the microchannels;
• and flowing a heat transfer fluid through the heat transfer channel to regulate the mass transfer process by conductively transferring heat through the fins.