Modified flow pattern maps for flow boiling in horizontal micro-finned tubes considering the effect of helix angle

Cheng Min Yang; Pega Hrnjak

doi:10.18462/iir.icr.2019.0857

Modified flow pattern maps for flow boiling in horizontal micro-finned tubes considering the effect of helix angle

Cheng Min Yang, Pega Hrnjak

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The existed flow pattern map of flow boiling are mainly developed for horizontal smooth tubes, which are not suitable for predicting the flow patterns in micro-finned tubes. This paper presents an improved flow pattern map for flow boiling in horizontal micro-finned tubes considering the effect of helix angle. Visualization of R410A flow boiling was carried out through the transparent smooth and micro-finned tubes with 0°, 10° and 18° helix angle. The result shows that the flow pattern map for micro-finned tube with 0° helix angle is generally similar to that in the smooth tube. For the tube with 10° and 18° helix angle, the annular flow occurs at lower vapor quality and lower mass flux. A modified model accounting for the early transition to annular flow in the micro-finned tubes is built.

Original language	English
Title of host publication	ICR 2019 - 25th IIR International Congress of Refrigeration
Editors	Vasile Minea
Publisher	International Institute of Refrigeration
Pages	1231-1238
Number of pages	8
ISBN (Electronic)	9782362150357
DOIs	https://doi.org/10.18462/iir.icr.2019.0857
State	Published - 2019
Externally published	Yes
Event	25th IIR International Congress of Refrigeration, ICR 2019 - Montreal, Canada Duration: Aug 24 2019 → Aug 30 2019

Publication series

Name	Refrigeration Science and Technology
Volume	2019-August
ISSN (Print)	0151-1637

Conference

Conference	25th IIR International Congress of Refrigeration, ICR 2019
Country/Territory	Canada
City	Montreal
Period	08/24/19 → 08/30/19

Funding

This study is supported by the Air-Conditioning and Refrigeration Center (ACRC) at the University of Illinois at Urbana-Champaign (UIUC). The authors would like to acknowledge the technical support from Creative Thermal Solutions Inc. (CTS). The authors are also grateful to MechSE RP Lab at UIUC for manufacturing 3D-printed tubes.

Keywords

Flow boiling
Flow pattern map
Helix angle
Micro-fin
Visualization

Access to Document

10.18462/iir.icr.2019.0857

Cite this

Yang, C. M., & Hrnjak, P. (2019). Modified flow pattern maps for flow boiling in horizontal micro-finned tubes considering the effect of helix angle. In V. Minea (Ed.), ICR 2019 - 25th IIR International Congress of Refrigeration (pp. 1231-1238). Article 857 (Refrigeration Science and Technology; Vol. 2019-August). International Institute of Refrigeration. https://doi.org/10.18462/iir.icr.2019.0857

@inproceedings{c2c975fe66ac40b09ef1036a5d7e97cd,

title = "Modified flow pattern maps for flow boiling in horizontal micro-finned tubes considering the effect of helix angle",

abstract = "The existed flow pattern map of flow boiling are mainly developed for horizontal smooth tubes, which are not suitable for predicting the flow patterns in micro-finned tubes. This paper presents an improved flow pattern map for flow boiling in horizontal micro-finned tubes considering the effect of helix angle. Visualization of R410A flow boiling was carried out through the transparent smooth and micro-finned tubes with 0°, 10° and 18° helix angle. The result shows that the flow pattern map for micro-finned tube with 0° helix angle is generally similar to that in the smooth tube. For the tube with 10° and 18° helix angle, the annular flow occurs at lower vapor quality and lower mass flux. A modified model accounting for the early transition to annular flow in the micro-finned tubes is built.",

keywords = "Flow boiling, Flow pattern map, Helix angle, Micro-fin, Visualization",

author = "Yang, \{Cheng Min\} and Pega Hrnjak",

note = "Publisher Copyright: {\textcopyright} 2019 International Institute of Refrigeration. All rights reserved.; 25th IIR International Congress of Refrigeration, ICR 2019 ; Conference date: 24-08-2019 Through 30-08-2019",

year = "2019",

doi = "10.18462/iir.icr.2019.0857",

language = "English",

series = "Refrigeration Science and Technology",

publisher = "International Institute of Refrigeration",

pages = "1231--1238",

editor = "Vasile Minea",

booktitle = "ICR 2019 - 25th IIR International Congress of Refrigeration",

}

Yang, CM & Hrnjak, P 2019, Modified flow pattern maps for flow boiling in horizontal micro-finned tubes considering the effect of helix angle. in V Minea (ed.), ICR 2019 - 25th IIR International Congress of Refrigeration., 857, Refrigeration Science and Technology, vol. 2019-August, International Institute of Refrigeration, pp. 1231-1238, 25th IIR International Congress of Refrigeration, ICR 2019, Montreal, Canada, 08/24/19. https://doi.org/10.18462/iir.icr.2019.0857

Modified flow pattern maps for flow boiling in horizontal micro-finned tubes considering the effect of helix angle. / Yang, Cheng Min; Hrnjak, Pega.
ICR 2019 - 25th IIR International Congress of Refrigeration. ed. / Vasile Minea. International Institute of Refrigeration, 2019. p. 1231-1238 857 (Refrigeration Science and Technology; Vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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T1 - Modified flow pattern maps for flow boiling in horizontal micro-finned tubes considering the effect of helix angle

AU - Yang, Cheng Min

AU - Hrnjak, Pega

PY - 2019

Y1 - 2019

N2 - The existed flow pattern map of flow boiling are mainly developed for horizontal smooth tubes, which are not suitable for predicting the flow patterns in micro-finned tubes. This paper presents an improved flow pattern map for flow boiling in horizontal micro-finned tubes considering the effect of helix angle. Visualization of R410A flow boiling was carried out through the transparent smooth and micro-finned tubes with 0°, 10° and 18° helix angle. The result shows that the flow pattern map for micro-finned tube with 0° helix angle is generally similar to that in the smooth tube. For the tube with 10° and 18° helix angle, the annular flow occurs at lower vapor quality and lower mass flux. A modified model accounting for the early transition to annular flow in the micro-finned tubes is built.

AB - The existed flow pattern map of flow boiling are mainly developed for horizontal smooth tubes, which are not suitable for predicting the flow patterns in micro-finned tubes. This paper presents an improved flow pattern map for flow boiling in horizontal micro-finned tubes considering the effect of helix angle. Visualization of R410A flow boiling was carried out through the transparent smooth and micro-finned tubes with 0°, 10° and 18° helix angle. The result shows that the flow pattern map for micro-finned tube with 0° helix angle is generally similar to that in the smooth tube. For the tube with 10° and 18° helix angle, the annular flow occurs at lower vapor quality and lower mass flux. A modified model accounting for the early transition to annular flow in the micro-finned tubes is built.

KW - Flow boiling

KW - Flow pattern map

KW - Helix angle

KW - Micro-fin

KW - Visualization

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BT - ICR 2019 - 25th IIR International Congress of Refrigeration

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ER -

Modified flow pattern maps for flow boiling in horizontal micro-finned tubes considering the effect of helix angle

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