## THERMAL SCIENCE

International Scientific Journal

### NUMERICAL INVESTIGATION ON SATURATED BOILING FLOW AND HEAT TRANSFER OF MIXTURE REFRIGERANT IN A VERTICAL RECTANGULAR MINI-CHANNEL

**ABSTRACT**

Plate-fin heat exchanger with rectangular minichannels, as a type of high-perfor- mance compact heat exchangers, has been widely used in liquefied natural gas field. However, the studies on saturated boiling flow and heat transfer for mixture refrigerant in plate-fin heat exchanger have been scarcely explored, which are helpful for designing more effective plate-fin heat exchanger using in liquefied natural gas field. Therefore, in this paper, the characteristics of saturated boiling flow and heat transfer for mixture refrigerant in rectangular minichannels of plate-fin heat exchanger were studied numerally based on validated model. Then, the effect of different parameters (vapor quality, mass flux, and heat flux) on heat transfer coefficient and frictional pressure drop were discussed. The results indicated that the boiling heat transfer coefficient and pressure drop are mainly influenced by quality and mass flux while heat flux has little influence on them. This is due to the fact that the main boiling mechanisms were forced convective boiling and the evaporation of dispersed liquid phase while nucleate boiling is slight.

**KEYWORDS**

PAPER SUBMITTED: 2017-10-26

PAPER REVISED: 2017-11-23

PAPER ACCEPTED: 2017-11-23

PUBLISHED ONLINE: 2018-02-18

**THERMAL SCIENCE** YEAR

**2018**, VOLUME

**22**, ISSUE

**Supplement 2**, PAGES [S617 - S627]

- Jiang, W.C., et al., A Comparison of Brazed Residual Stress in Plate-fin Structure Made of Different Stainless Steel, Materials & Design, 30 (2009), pp. 23-27
- Kuznetsov, V.V., Shamirzaev, A.S., Boiling Heat Transfer for Freon R21 in Rectangular Minichannel, Heat Transfer Engineering, 28 (2007), pp. 738-745
- Kandlikar, S.G., Development of a Flow Boiling Map for Subcooled and Saturated Flow Boiling of Different Fluids inside Circular Tubes, Journal of Heat Transfer-Transactions of the ASME, 113 (1991), pp. 190-200
- Kandlikar, S.G., Balasubramanian P., An Extension of the Flow Boiling Correlation to Transition, Laminar, and Deep Laminar Flows and Microchannels, Selected Papers Presented at the First International Conference on Microchannels and Minichannels. 3 ed: Taylor and Francis Ltd, (2004), pp. 86-93
- Charnay, R., et al., Flow Boiling Heat Transfer in Minichannels at High Saturation Temperatures: Part I-Experimental Investigation and Analysis of the Heat Transfer Mechanisms, International Journal of Heat and Mass Transfer, 87 (2015), pp. 636-652
- Charnay, R., et al., Flow Boiling Heat Transfer in Minichannels at High Saturation Temperatures: Part II-Assessment of Predictive Methods and Impact of Flow Regimes, International Journal of Heat and Mass Transfer, 87 (2015), pp. 653-672
- Oliveira, J.D., et al., An Experimental Investigation on Flow Boiling Heat Transfer of R-600a in a Horizontal Small Tube, International Journal of Refrigeration, 72 (2016), pp. 97-110
- Marzoa, M.G., et al., Experimental Flow Boiling Heat Transfer in a Small Polyimide Channel, Applied Thermal Engineering, 103 (2016), pp. 1324-1338
- Xu, Y., et al., An Experimental Study of Flow Boiling Heat Transfer of R134a and Evaluation of Existing Correlations, International Journal of Heat and Mass Transfer, 92 (2016), pp. 1143-1157
- Chien, N.B., et al., Boiling Heat Transfer of R32, CO2 and R290 inside Horizontal Minichannel, Energy Procedia, 105 (2017), pp. 4822-4827
- Feldman, A., et al., Nucleate and Convective Boiling in Plate Fin Heat Exchangers, International Journal of Heat and Mass Transfer, 43 (2000), 18, pp. 3433-3442
- Kew, P.A., Cornwell, K., Correlations for the Prediction of Boiling Heat Transfer in Small-diameter Channels, Applied Thermal Engineering, 17 (1997), pp. 705-715
- Raja, B., et al., Flow Boiling Heat Transfer Coefficient of R-134a/R-290/R-600a Mixture in a Smooth Horizontal Tube, Thermal Science, 12 (2008), pp. 33-44
- Anwar, Z., et al., Flow Boiling Heat Transfer, Pressure Drop and Dryout Characteristics of R1234yf: Experimental Results and Predictions, Experimental Thermal and Fluid Science, 66 (2015), pp. 137-149
- Li, J., et al., Up-flow Boiling of R1234yf in Aluminum Multi-port Extruded Tubes, International Journal of Heat and Mass Transfer, 114 (2017), pp. 826-836
- Boudouh, M., et al., Experimental Investigation of Convective Boiling in Mini-channels: Cooling Application of the Proton Exchange Membrane Fuel Cells, Thermal Science, 21 (2017), pp. 223-232
- Dong, Z., et al., Numerical Study of Vapor Bubble Effect on Flow and Heat Transfer in Microchannel, International Journal of Thermal Sciences, 54 (2012), pp. 22-32
- Magnini, M., et al., Numerical investigation of Hydrodynamics and Heat Transfer of Elongated Bubbles during Flow Boiling in a Microchannel, International Journal of Heat and Mass Transfer, 59 (2013), pp. 451-471
- Krishnan, R.N., et al., Performance of Numerical Schemes in the Simulation of Two-phase Free Flows and Wall Bounded Minichannel Flows, Chemical Engineering Science, 65 (2010), pp. 5117-5136
- Son, G., et al., Numerical Simulation of Bubble Merger Process on a Single Nucleation Site during Pool Nucleate Boiling, Journal of Heat Transfer, 124 (2002), pp. 51-62
- Kandlikar, S.G., Fundamental Issues Related to Flow Boiling in Minichannels and Microchannels, Experimental Thermal and Fluid Science, 26 (2002), pp. 389-407
- Zhang, W., et al., Correlation for Flow Boiling Heat Transfer in Mini-channels, International Journal of Heat and Mass Transfer, 47 (2004), pp. 5749-5763
- Cai, W.H., et al., Numerical Investigation on Saturated Boiling Heat Transfer in a Vertical Rectangular Minichannel, ASME 2015 Joint Fluids Engineering Conference, 2015, pp. V001T30A003
- Ma, H.Q., et al., Numverical Investigation on Saturated Boiling and Heat Transfer Correlations in a Vertical Rectangular Minichannel, International Journal of Thermal Science, 102 (2016), pp. 285-299
- Li, S.L., et al., Numerical Study on the Flow and Heat Transfer Characteristics of Forced Convective Condensation with Propane in a Spiral Pipe, International Journal of Heat and Mass Transfer, 117 (2018), pp. 1169-1187
- Ranz, W.E., Marshall, W.R., Evaporation from drops, Chemical Engineering Progress, 48 (1952), pp. 141-146