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

Kathleen De Kerpel UGent, Bernd Ameel UGent, Hugo Canière and Michel De Paepe UGent (2011) Congres International du Froid-International Congress of Refrigeration. 23. p.1365-1373
abstract
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.
Please use this url to cite or link to this publication:
author
organization
year
type
conference (proceedingsPaper)
publication status
published
subject
keyword
PATTERN, PIPES, SUBJECT, AIR-WATER, RETURN BENDS, R-22, SMALL-DIAMETER TUBES
in
Congres International du Froid-International Congress of Refrigeration
volume
23
issue title
23RD IIR INTERNATIONAL CONGRESS OF REFRIGERATION
pages
1365 - 1373
publisher
International Institute of Refrigeration (IIR)
conference name
23rd International-Institute-of-Refrigeration(IIR) International Congress of Refrigeration
conference location
Prague, Czech Republic
conference start
2011-08-21
conference end
2011-08-26
Web of Science type
Proceedings Paper
Web of Science id
000310485800181
ISSN
1025-9031
ISBN
9782913149892
language
English
UGent publication?
yes
classification
P1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1896919
handle
http://hdl.handle.net/1854/LU-1896919
date created
2011-09-02 10:40:36
date last changed
2016-12-19 15:36:37
@inproceedings{1896919,
  abstract     = {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.},
  author       = {De Kerpel, Kathleen and Ameel, Bernd and Cani{\`e}re, Hugo and De Paepe, Michel},
  booktitle    = {Congres International du Froid-International Congress of Refrigeration},
  isbn         = {9782913149892},
  issn         = {1025-9031},
  keyword      = {PATTERN,PIPES,SUBJECT,AIR-WATER,RETURN BENDS,R-22,SMALL-DIAMETER TUBES},
  language     = {eng},
  location     = {Prague, Czech Republic},
  pages        = {1365--1373},
  publisher    = {International Institute of Refrigeration (IIR)},
  title        = {Study of two phase flow in hairpins by means of image processing and pressure drop measurements},
  volume       = {23},
  year         = {2011},
}

Chicago
De Kerpel, Kathleen, Bernd Ameel, Hugo Canière, and Michel De Paepe. 2011. “Study of Two Phase Flow in Hairpins by Means of Image Processing and Pressure Drop Measurements.” In Congres International Du Froid-International Congress of Refrigeration, 23:1365–1373. International Institute of Refrigeration (IIR).
APA
De Kerpel, K., Ameel, B., Canière, H., & De Paepe, M. (2011). Study of two phase flow in hairpins by means of image processing and pressure drop measurements. Congres International du Froid-International Congress of Refrigeration (Vol. 23, pp. 1365–1373). Presented at the 23rd International-Institute-of-Refrigeration(IIR) International Congress of Refrigeration, International Institute of Refrigeration (IIR).
Vancouver
1.
De Kerpel K, Ameel B, Canière H, De Paepe M. Study of two phase flow in hairpins by means of image processing and pressure drop measurements. Congres International du Froid-International Congress of Refrigeration. International Institute of Refrigeration (IIR); 2011. p. 1365–73.
MLA
De Kerpel, Kathleen, Bernd Ameel, Hugo Canière, et al. “Study of Two Phase Flow in Hairpins by Means of Image Processing and Pressure Drop Measurements.” Congres International Du Froid-International Congress of Refrigeration. Vol. 23. International Institute of Refrigeration (IIR), 2011. 1365–1373. Print.