Abstract
The present study investigated two-phase flow distribution and pressure drop in microchannel tubes under non-heating and heating conditions using R-22. The test section consisted of inlet and outlet headers with the inner diameter of 19.4 mm and had 15 or 41 parallel microchannel tubes. Each microchannel tube had 8 rectangular ports with hydraulic diameter of 1.3 mm. For non-heating condition, the key experimental parameters were orientation of the header, flow direction of refrigerant into the inlet header, and inlet quality. For heating condition, the key experimental parameters were inclination angle, mass flow rate, and inlet quality. It was found that the effect of the orientation of the header on the two-phase flow distribution and pressure drop was the largest under the non-heating condition. Two-phase pressure drops through the microchannel tubes with the horizontal header were higher than those of the microchannel tubes with the vertical header due to the gravitational effect. Under the heating condition, the cooling capacities of three prototype evaporators were changed as the mass flow rate and inlet quality were increased due to the flow mal-distribution.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Nanoscale and Microscale Thermophysical Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
