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Abstract
Flow boiling pressure drop and flow instabilities of Ω-shaped reentrant copper micro-channels were experimentally explored. Tests were conducted in deionized water and ethanol at inlet subcoolings of 10°C and 40°C, mass fluxes of 125–300 kg/m2·s, and a wide range of heat fluxes and exit vapor qualities. The operational parameters effects, i.e., heat flux, mass flux, inlet subcooling, and coolants, on pressure drop and flow instabilities were systematically explored. The two-phase pressure drop of reentrant micro-channels were found to generally increase monotonically with increasing heat fluxes and exit vapor qualities. Nevertheless, the roles of mass flux and inlet subcooling were dependent on the test coolant.
Funding
The research was financially supported by the National Nature Science Foundation of China (grant 51405407); the Fundamental Research Funds for the Central Universities, Xiamen University (grant 20720150094); the Science and Technology Planning Project for Industry-University-Research Cooperation in Huizhou City (grant 2014B050013002); the Open Fund of the State Key Laboratory of High Performance Complex Manufacturing (grant Kfkt2015-08), and the open fund of state. Key Laboratory of Fluid Power and Mechatronic Systems (Zhejiang University) (GZKF-201504). Furthermore, the financial support of the Collaborative Innovation Center of High-End Equipment Manufacturing in FuJian is also acknowledged.