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The refrigerant two-phase flow void fraction in the vicinity of a sharp return bend

Kathleen De Kerpel (UGent) , Sven De Schampheleire (UGent) , Alihan Kaya (UGent) , Marijn Billiet (UGent) and Michel De Paepe (UGent)
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Abstract
In this work, the void fraction is measured for two-phase refrigerant flow at several locations up-and downstream of a sharp return bend. The tube diameter D ranges between 4.83 mm and 8 mm and the curvature radius of the bend (2R/D) ranges between 2.5 and 4.5. The void fraction measurement is based on the electrical capacitance of the flow. The refrigerant used is R134a, the mass flux was varied between 200 and 600 kg/m²s and the vapour quality varied between 0 and 1. The tubes up-and downstream of the return bend are horizontal and the plane of the bend is placed vertical. Downward as well as upward oriented flow through the bend was tested. Three flow regimes were observed: slug flow, intermittent flow and annular flow. A significant effect is observed downstream of the return bend, upstream the result was limited. Furthermore, the influence of the bend decreases with decreasing channel diameter.
Keywords
Refrigerant, two-phase flow, void fraction

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Chicago
De Kerpel, Kathleen, Sven De Schampheleire, Alihan Kaya, Marijn Billiet, and Michel De Paepe. 2015. “The Refrigerant Two-phase Flow Void Fraction in the Vicinity of a Sharp Return Bend.” In IIR International Congress of Refrigeration, Proceedings.
APA
De Kerpel, K., De Schampheleire, S., Kaya, A., Billiet, M., & De Paepe, M. (2015). The refrigerant two-phase flow void fraction in the vicinity of a sharp return bend. IIR International Congress of Refrigeration, Proceedings. Presented at the IIR International Congress of Refrigeration (ICR 2015).
Vancouver
1.
De Kerpel K, De Schampheleire S, Kaya A, Billiet M, De Paepe M. The refrigerant two-phase flow void fraction in the vicinity of a sharp return bend. IIR International Congress of Refrigeration, Proceedings. 2015.
MLA
De Kerpel, Kathleen, Sven De Schampheleire, Alihan Kaya, et al. “The Refrigerant Two-phase Flow Void Fraction in the Vicinity of a Sharp Return Bend.” IIR International Congress of Refrigeration, Proceedings. 2015. Print.
@inproceedings{6913913,
  abstract     = {In this work, the void fraction is measured for two-phase refrigerant flow at several locations up-and downstream of a sharp return bend. The tube diameter D ranges between 4.83 mm and 8 mm and the curvature radius of the bend (2R/D) ranges between 2.5 and 4.5. The void fraction measurement is based on the electrical capacitance of the flow. The refrigerant used is R134a, the mass flux was varied between 200 and 600 kg/m{\texttwosuperior}s and the vapour quality varied between 0 and 1. The tubes up-and downstream of the return bend are horizontal and the plane of the bend is placed vertical. Downward as well as upward oriented flow through the bend was tested. Three flow regimes were observed: slug flow, intermittent flow and annular flow. A significant effect is observed downstream of the return bend, upstream the result was limited. Furthermore, the influence of the bend decreases with decreasing channel diameter.},
  author       = {De Kerpel, Kathleen and De Schampheleire, Sven and Kaya, Alihan and Billiet, Marijn and De Paepe, Michel},
  booktitle    = {IIR International Congress of Refrigeration, Proceedings},
  isbn         = {978-2362-1501-2-8},
  language     = {eng},
  location     = {Yokohama, Japan},
  pages        = {8},
  title        = {The refrigerant two-phase flow void fraction in the vicinity of a sharp return bend},
  year         = {2015},
}