Diabatic visualization shows effects of micro-fins on evaporation of R410A: Smooth, axial micro-fin, and helical micro-fin tubes

Yang, Cheng-Min; Hrnjak, Pega

doi:10.1016/j.ijheatmasstransfer.2019.119276

Title: Diabatic visualization shows effects of micro-fins on evaporation of R410A: Smooth, axial micro-fin, and helical micro-fin tubes

Abstract

A novel approach to visualize the flow boiling inside a clear micro-fin tube under diabatic conditions is presented. Transparent smooth, axial micro-fin, and helical micro-fin tubes are made by 3D printing. The 3D printed tube is placed inside a glass tube and heated by the transparent secondary fluid flowing between the two tubes for providing the evaporation conditions and transparency. R410A flow boiling and the flow patterns in the three geometries captured with a high speed camera are compared. The experimental results show that micro-fin geometry influences flow behavior. Bubbles are mainly generated in the groove region due to a higher superheat than the fin region. Some of the liquid refrigerant is trapped in the grooves of the upper part of the micro-fin tube when the slug flow is present, and bubbles are generated in this thin liquid layer. In addition, the bubbles in the helical micro-fin tube are easier to merge because of the obstacle of the fin geometry for the bubble flowing path. As the two bubble merge, the conversion of surface free energy causes the bubble to travel with a higher velocity.

Authors:

Yang, Cheng-Min ^[1]; Hrnjak, Pega ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Illinois at Urbana-Champaign, IL (United States)

Publication Date:: Tue Jun 16 00:00:00 EDT 2020

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1615186

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: International Journal of Heat and Mass Transfer

Additional Journal Information:: Journal Volume: 150; Journal Issue: C; Journal ID: ISSN 0017-9310

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; Flow visualization; Micro-fin; 3D printed; Flow boiling; Diabatic conditions

Citation Formats


                    Yang, Cheng-Min, and Hrnjak, Pega. Diabatic visualization shows effects of micro-fins on evaporation of R410A: Smooth, axial micro-fin, and helical micro-fin tubes.  United States: N. p., 2020. 
Web.  doi:10.1016/j.ijheatmasstransfer.2019.119276.

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                    Yang, Cheng-Min, & Hrnjak, Pega. Diabatic visualization shows effects of micro-fins on evaporation of R410A: Smooth, axial micro-fin, and helical micro-fin tubes.  United States.  https://doi.org/10.1016/j.ijheatmasstransfer.2019.119276

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                    Yang, Cheng-Min, and Hrnjak, Pega. Tue .  
"Diabatic visualization shows effects of micro-fins on evaporation of R410A: Smooth, axial micro-fin, and helical micro-fin tubes".  United States.  https://doi.org/10.1016/j.ijheatmasstransfer.2019.119276.  https://www.osti.gov/servlets/purl/1615186.

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@article{osti_1615186,

  title        = {Diabatic visualization shows effects of micro-fins on evaporation of R410A: Smooth, axial micro-fin, and helical micro-fin tubes},

  author       = {Yang, Cheng-Min and Hrnjak, Pega},

  abstractNote = {A novel approach to visualize the flow boiling inside a clear micro-fin tube under diabatic conditions is presented. Transparent smooth, axial micro-fin, and helical micro-fin tubes are made by 3D printing. The 3D printed tube is placed inside a glass tube and heated by the transparent secondary fluid flowing between the two tubes for providing the evaporation conditions and transparency. R410A flow boiling and the flow patterns in the three geometries captured with a high speed camera are compared. The experimental results show that micro-fin geometry influences flow behavior. Bubbles are mainly generated in the groove region due to a higher superheat than the fin region. Some of the liquid refrigerant is trapped in the grooves of the upper part of the micro-fin tube when the slug flow is present, and bubbles are generated in this thin liquid layer. In addition, the bubbles in the helical micro-fin tube are easier to merge because of the obstacle of the fin geometry for the bubble flowing path. As the two bubble merge, the conversion of surface free energy causes the bubble to travel with a higher velocity.},

  doi          = {10.1016/j.ijheatmasstransfer.2019.119276},

  journal      = {International Journal of Heat and Mass Transfer},

  number       = C,

  volume       = 150,

  place        = {United States},

  year         = {Tue Jun 16 00:00:00 EDT 2020},

  month        = {Tue Jun 16 00:00:00 EDT 2020}

}

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https://doi.org/10.1016/j.ijheatmasstransfer.2019.119276

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Similar Records

Title: Diabatic visualization shows effects of micro-fins on evaporation of R410A: Smooth, axial micro-fin, and helical micro-fin tubes

Abstract

Citation Formats

The interrelation between void fraction fluctuations and flow patterns in two-phase flow journal, December 1975

On the development of an objective flow regime indicator journal, April 1982

Real-time cross-sectional averaged void fraction measurements in vertical annulus gas-liquid two-phase flow by neutron radiography and X-ray tomography techniques journal, March 1996

Separated two-phase flow regime parameter measurement by a high speed ultrasonic pulse-echo system journal, November 2007

Non-invasive imaging of liquid/gas flow using ultrasonic transmission-mode tomography journal, April 2007

Nuclear Magnetic Resonance as a tool to Study flow journal, January 1999

An Experimental Study of Evaporation Heat Transfer of Refrigerant HCFC22 Inside an Internally Grooved Horizontal Tube. journal, January 1995

Heat transfer and flow pattern during two-phase flow boiling of R-134a in horizontal smooth and microfin tubes journal, September 2002

Flow pattern and heat transfer characteristics during flow boiling of CO2 in a horizontal micro fin tube and comparison with smooth tube data journal, December 2005

Experimental study of flow patterns and regimes of condensation in horizontal three-dimensional micro-fin tubes journal, February 2006

Heat transfer, pressure drop, and flow pattern recognition during condensation inside smooth, helical micro-fin, and herringbone tubes journal, June 2007

A new flow pattern map for flow boiling in microfin tubes journal, June 2015

Visualization of two-phase flow through microgrooved tubes for understanding enhanced heat transfer journal, October 2003

Visualization of two-phase flow of R410A in horizontal smooth and axial micro-finned tubes journal, August 2019

Effect of helical micro-fins on two-phase flow behavior of R410A evaporating in horizontal round tubes obtained through visualization journal, December 2019

Flow vaporization of CO2 in microchannel tubes journal, January 2004

Visualization and measurement of periodic reverse flow and boiling fluctuations in a microchannel evaporator of an air-conditioning system journal, April 2014

Prediction of Flow Regimes in Horizontal Tube-Side Condensation journal, October 1979

Flow regimes during condensation in superheated zone journal, December 2017

A new flow regime map and void fraction model based on the flow characterization of condensation journal, May 2017

Visualization of Flow Boiling in an Annular Heat Exchanger Under Microgravity Conditions journal, July 2001

Effect of straight micro fins on heat transfer and pressure drop of R410A during evaporation in round tubes journal, February 2018

Quantification of flow and retention of oil in compressor discharge pipe journal, August 2017

Describing the uncertainties in experimental results journal, January 1988

A new flow pattern map for flow boiling of R410A in horizontal micro-fin tubes considering the effect of the helix angle journal, January 2020

The interrelation between void fraction fluctuations and flow patterns in two-phase flow
journal, December 1975

On the development of an objective flow regime indicator
journal, April 1982

Real-time cross-sectional averaged void fraction measurements in vertical annulus gas-liquid two-phase flow by neutron radiography and X-ray tomography techniques
journal, March 1996

Separated two-phase flow regime parameter measurement by a high speed ultrasonic pulse-echo system
journal, November 2007

Non-invasive imaging of liquid/gas flow using ultrasonic transmission-mode tomography
journal, April 2007

Nuclear Magnetic Resonance as a tool to Study flow
journal, January 1999

An Experimental Study of Evaporation Heat Transfer of Refrigerant HCFC22 Inside an Internally Grooved Horizontal Tube.
journal, January 1995

Heat transfer and flow pattern during two-phase flow boiling of R-134a in horizontal smooth and microfin tubes
journal, September 2002

Flow pattern and heat transfer characteristics during flow boiling of CO2 in a horizontal micro fin tube and comparison with smooth tube data
journal, December 2005

Experimental study of flow patterns and regimes of condensation in horizontal three-dimensional micro-fin tubes
journal, February 2006

Heat transfer, pressure drop, and flow pattern recognition during condensation inside smooth, helical micro-fin, and herringbone tubes
journal, June 2007

A new flow pattern map for flow boiling in microfin tubes
journal, June 2015

Visualization of two-phase flow through microgrooved tubes for understanding enhanced heat transfer
journal, October 2003

Visualization of two-phase flow of R410A in horizontal smooth and axial micro-finned tubes
journal, August 2019

Effect of helical micro-fins on two-phase flow behavior of R410A evaporating in horizontal round tubes obtained through visualization
journal, December 2019

Flow vaporization of CO2 in microchannel tubes
journal, January 2004

Visualization and measurement of periodic reverse flow and boiling fluctuations in a microchannel evaporator of an air-conditioning system
journal, April 2014

Prediction of Flow Regimes in Horizontal Tube-Side Condensation
journal, October 1979

Flow regimes during condensation in superheated zone
journal, December 2017

A new flow regime map and void fraction model based on the flow characterization of condensation
journal, May 2017

Visualization of Flow Boiling in an Annular Heat Exchanger Under Microgravity Conditions
journal, July 2001

Effect of straight micro fins on heat transfer and pressure drop of R410A during evaporation in round tubes
journal, February 2018

Quantification of flow and retention of oil in compressor discharge pipe
journal, August 2017

Describing the uncertainties in experimental results
journal, January 1988

A new flow pattern map for flow boiling of R410A in horizontal micro-fin tubes considering the effect of the helix angle
journal, January 2020