Analysis and quantification of generated bubbles for flow boiling through diabatic visualization

Cheng Min Yang; Pega Hrnjak

doi:10.18462/iir.icr.2019.0858

Analysis and quantification of generated bubbles for flow boiling through diabatic visualization

Cheng Min Yang, Pega Hrnjak

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

1 Scopus citations

Abstract

This paper aims at presenting the heat transfer analysis of flow boiling in horizontal smooth and micro-finned tubes through visualization in diabatic conditions. Visualization of R410A flow boiling experiments were conducted in a transparent concentric heat exchanger. 3D printed clear resin tubes with different geometries are placed in an outer glass tube with annular water flow for visualizing the flow during evaporation. Parameters of generated bubble such as departure diameter and frequency are quantified based on visualization using high-speed camera and video processing techniques. Heat transfer in the test section is analyzed through the temperature measurements and estimated bubble parameters. Two regions of incipience of boiling are found in the current experiments. As the superheat is insufficient to reach the onset point of nucleate boiling, the heat transfer is governed by forced convection. At a higher heat flux, the heat transfer is by the mechanisms of the forced convection and surface nucleate boiling.

Original language	English
Title of host publication	ICR 2019 - 25th IIR International Congress of Refrigeration
Editors	Vasile Minea
Publisher	International Institute of Refrigeration
Pages	1239-1245
Number of pages	7
ISBN (Electronic)	9782362150357
DOIs	https://doi.org/10.18462/iir.icr.2019.0858
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

3D printed
Diabatic condition
Flow boiling
Micro-fin
Visualization

Access to Document

10.18462/iir.icr.2019.0858

Cite this

Yang, C. M., & Hrnjak, P. (2019). Analysis and quantification of generated bubbles for flow boiling through diabatic visualization. In V. Minea (Ed.), ICR 2019 - 25th IIR International Congress of Refrigeration (pp. 1239-1245). Article 858 (Refrigeration Science and Technology; Vol. 2019-August). International Institute of Refrigeration. https://doi.org/10.18462/iir.icr.2019.0858

@inproceedings{96b6f3886d724762836262971583e98d,

title = "Analysis and quantification of generated bubbles for flow boiling through diabatic visualization",

abstract = "This paper aims at presenting the heat transfer analysis of flow boiling in horizontal smooth and micro-finned tubes through visualization in diabatic conditions. Visualization of R410A flow boiling experiments were conducted in a transparent concentric heat exchanger. 3D printed clear resin tubes with different geometries are placed in an outer glass tube with annular water flow for visualizing the flow during evaporation. Parameters of generated bubble such as departure diameter and frequency are quantified based on visualization using high-speed camera and video processing techniques. Heat transfer in the test section is analyzed through the temperature measurements and estimated bubble parameters. Two regions of incipience of boiling are found in the current experiments. As the superheat is insufficient to reach the onset point of nucleate boiling, the heat transfer is governed by forced convection. At a higher heat flux, the heat transfer is by the mechanisms of the forced convection and surface nucleate boiling.",

keywords = "3D printed, Diabatic condition, Flow boiling, 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.2019.0858",

language = "English",

series = "Refrigeration Science and Technology",

publisher = "International Institute of Refrigeration",

pages = "1239--1245",

editor = "Vasile Minea",

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

}

Yang, CM & Hrnjak, P 2019, Analysis and quantification of generated bubbles for flow boiling through diabatic visualization. in V Minea (ed.), ICR 2019 - 25th IIR International Congress of Refrigeration., 858, Refrigeration Science and Technology, vol. 2019-August, International Institute of Refrigeration, pp. 1239-1245, 25th IIR International Congress of Refrigeration, ICR 2019, Montreal, Canada, 08/24/19. https://doi.org/10.18462/iir.icr.2019.0858

Analysis and quantification of generated bubbles for flow boiling through diabatic visualization. / Yang, Cheng Min; Hrnjak, Pega.
ICR 2019 - 25th IIR International Congress of Refrigeration. ed. / Vasile Minea. International Institute of Refrigeration, 2019. p. 1239-1245 858 (Refrigeration Science and Technology; Vol. 2019-August).

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

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AU - Hrnjak, Pega

PY - 2019

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N2 - This paper aims at presenting the heat transfer analysis of flow boiling in horizontal smooth and micro-finned tubes through visualization in diabatic conditions. Visualization of R410A flow boiling experiments were conducted in a transparent concentric heat exchanger. 3D printed clear resin tubes with different geometries are placed in an outer glass tube with annular water flow for visualizing the flow during evaporation. Parameters of generated bubble such as departure diameter and frequency are quantified based on visualization using high-speed camera and video processing techniques. Heat transfer in the test section is analyzed through the temperature measurements and estimated bubble parameters. Two regions of incipience of boiling are found in the current experiments. As the superheat is insufficient to reach the onset point of nucleate boiling, the heat transfer is governed by forced convection. At a higher heat flux, the heat transfer is by the mechanisms of the forced convection and surface nucleate boiling.

AB - This paper aims at presenting the heat transfer analysis of flow boiling in horizontal smooth and micro-finned tubes through visualization in diabatic conditions. Visualization of R410A flow boiling experiments were conducted in a transparent concentric heat exchanger. 3D printed clear resin tubes with different geometries are placed in an outer glass tube with annular water flow for visualizing the flow during evaporation. Parameters of generated bubble such as departure diameter and frequency are quantified based on visualization using high-speed camera and video processing techniques. Heat transfer in the test section is analyzed through the temperature measurements and estimated bubble parameters. Two regions of incipience of boiling are found in the current experiments. As the superheat is insufficient to reach the onset point of nucleate boiling, the heat transfer is governed by forced convection. At a higher heat flux, the heat transfer is by the mechanisms of the forced convection and surface nucleate boiling.

KW - 3D printed

KW - Diabatic condition

KW - Flow boiling

KW - Micro-fin

KW - Visualization

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SP - 1239

EP - 1245

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

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Y2 - 24 August 2019 through 30 August 2019

ER -

Analysis and quantification of generated bubbles for flow boiling through diabatic visualization

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