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

Cheng Min Yang, Pega Hrnjak

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-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 languageEnglish
Title of host publicationICR 2019 - 25th IIR International Congress of Refrigeration
EditorsVasile Minea
PublisherInternational Institute of Refrigeration
Pages1239-1245
Number of pages7
ISBN (Electronic)9782362150357
DOIs
StatePublished - 2019
Externally publishedYes
Event25th IIR International Congress of Refrigeration, ICR 2019 - Montreal, Canada
Duration: Aug 24 2019Aug 30 2019

Publication series

NameRefrigeration Science and Technology
Volume2019-August
ISSN (Print)0151-1637

Conference

Conference25th IIR International Congress of Refrigeration, ICR 2019
Country/TerritoryCanada
CityMontreal
Period08/24/1908/30/19

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.

FundersFunder number
Air-Conditioning and Refrigeration Center
Creative Thermal Solutions Inc.
University of Illinois at Urbana-Champaign
Canadian Thoracic Society

    Keywords

    • 3D printed
    • Diabatic condition
    • Flow boiling
    • Micro-fin
    • Visualization

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