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Study of two-phase flow in hairpins by means of image processing and pressure drop measurements.

Number: pap. ID: 368

Author(s) : DE KERPEL K., AMEEL B., CANIÈRE H., et al.

Summary

Two-phase flow of refrigerant R134a in a hairpin was studied. The hairpin consists of a smooth tube with an inner diameter of 8 mm and U-bend of radius 11 mm. Because of the forces exerted on the flow in the U-bend the flow needs to develop again downstream of the U-bend. The effects of this phenomenon on the pressure drop are studied and linked to a visual observation of the flow. Pressure drop and videos of the flow behaviour are recorded in the straight sections upstream and downstream of the U-bend. Afterwards, they are compared with flow and pressure drop characteristics for developed flow. The pressure drop of the downstream of the U-bend was found to be consistently higher than that for developed flow. It exceeded the pressure drop in case of developed flow by an average of 30% for all data points. Each video of the flow behaviour was reduced to a single image by calculating the standard deviation of the time signal per pixel in time. The standard deviation profiles were compared in order to quantitatively evaluate the change in the flow behaviour. For the flow of downstream of the U-bend, a disturbance was observed that stretches out over more than 30 diameters of downstream of the U-bend.

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Pages: 9 p.

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Details

  • Original title: Study of two-phase flow in hairpins by means of image processing and pressure drop measurements.
  • Record ID : 30002728
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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