Friction and Heat Transfer Characteristics of Single Phase Flow of Refrigerant in Microchannels

The expeimental investigation on the friction and heat transfer characteristics of single phase flow of typical refrigerant R12 in microchannels have been obtained, Results from experiments indicate that there is great departures from microchannel to conventional size channel. The friction coefficient in microchannel is bigger than that in conventional size channel, while the critical Reynolds number decreases.