Studied the critical heat flux in tubes microchannels. Different two and three as the refrigerant (r134a, r236fa, r245fa) is the microchannels. This box of 20 parallel channel width, depth 467 μm,.4052 μm, respectively, a second microchannel has 29 channels with a length of 30 mm in the direction of flow, length 20 mm at the center is heated with electric resistance experimental data were compared with the prediction methods are available.
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