Numerical simulation and experimental study of equal difference tree shaped diversion in cryogenic micro-channels
Aiming at the problem of flow distribution and pressure loss at the inlet and outlet of microchannel heat exchangers,an equal difference tree diversion method was proposed.Differ-ent diversion structures of inlet and outlet flow channels were designed,and microchannel heat ex-changer plate models with different diversion structures were constructed,a theoretical calculation model for pressure loss was established,a three-dimensional model of microchannel heat exchanger was constructed,and flow distribution and pressure loss numerical simulation were carried out.The experimental models of microchannel heat exchangers with different diversion structures were manufactured,and verified the theoretical calculation model and numerical model through experi-ments.The research shows that diversion channels with different diversion structures designed based on the equal difference tree diversion method can solve the problem of uneven flow distribu-tion.The proposed pressure drop calculation method can provide a basis for calculating the pres-sure loss of microchannel heat exchangers with different structures.The trapezoidal diversion structure has the best flow uniformity and the smallest pressure loss.
microchannel heat exchangertree shaped diversion methodpressure lossflow distribution
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