Abstract
The pressure bearing capability of a folded multi-port flat tube (MPFT), which has the advantage of retaining the corrosion property of corrosion resistant materials, was investigated in this study with both a burst pressure test and finite element simulation. Results show that the folded tube’s failure is mainly caused by the breaking of the inner ribs. Instead of detecting inner pressure, the bulging ratio, which is supposed to be small under service pressure, rises rapidly before failure. Therefore, it is suggested to use bulging ratio to visibly determine the working status of folded MPFTs. Based on FE simulations, the pressure bearing capability of the folded MPFT was improved by optimizing the relevant folding parameters. In addition, the influence of in-plane bending was also investigated. It is found that the folded MPFTs can still retain most of the pressure bearing capability after in-plane bending.
Highlights
Aluminum (Al) flat section tubes are widely used in Heating, Ventilation, Air Conditioning &Refrigerating (HVAC&R) application [1,2]
It is worth noting that the service pressure of the tube is around 6 MPa, where the corresponding bulging ratios obtained from both experiments and simulations are less than 5%
The pressure bearing capability of folded multi-port flat tube (MPFT) was investigated with finite element analysis and a burst pressure test
Summary
Aluminum (Al) flat section tubes are widely used in Heating, Ventilation, Air Conditioning &Refrigerating (HVAC&R) application [1,2]. Aluminum (Al) flat section tubes are widely used in Heating, Ventilation, Air Conditioning &. Multi-port flat tubes (MPFTs) are mostly processed via extrusion, which divides an Al billet into two materials and flows through a porthole die, and rejoins and seam welds them together in the welding chamber. Since the service conditions usually involve inner pressure, the pressure bearing capability is a crucial property of an MPFT [3,4,5,6,7,8]. Post-treatment on both the inner and outer surfaces of an extruded MPFT is not effective to improve corrosion resistance [3]. The limited service life of an extruded MPFT is still the main constraint for its wide application
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