Investigation of Effect of Geometric Structure on Two Phase Flow Heat Transfer in Microchannels

Document Type : Original Article

Authors

1 Master's degree, Malik Ashtar University of Technology, Tehran, Iran

2 Assistant Professor, Malik Ashtar University of Technology, Tehran, Iran

3 Associate Professor, Malik Ashtar University of Technology, Tehran, Iran

Abstract

In this research, the numerical analysis of the flow structure and two-phase heat transfer in micro-channels with hydraulic diameters of 0.55 and 0.7 mm has been investigated. For this purpose, Fluent software was used and programming was done to model the phase change in this software. The inlet flow is assumed to be supersaturated vapor of R134A refrigerant at different mass fluxes at the entrance of the microchannel and the wall of the microchannel is considered as a constant flux. The effect of the geometrical shape of the cross-section of the micro-channel in 3 geometries of circular, square and trapezoidal cross-section in the input mass flux range of 〖kg/(m〗^2 s) 100-600 on the heat transfer coefficient and pressure drop has been evaluated. The results show that under the same conditions of the inlet mass flux and the cross-sectional area of ​​the microchannel, the heat transfer coefficient in the microchannel with a hydraulic diameter of 0.55 mm is about 15% higher. Also, in a certain range of the input mass flux, the pressure drop in the hydraulic diameter of 0.55 mm is about 3 times the pressure drop in the hydraulic diameter of 0.7 mm. In both hydraulic diameters of 0.55 and 0.7 mm, square, circular and trapezoidal microchannels had the highest heat transfer coefficient, respectively.

Keywords

Smiley face

References

  1.             

    1. Shin, J. S., and Kim, M. H. "An Experimental Study of Flow Condensation Heat Transfer Inside Circular and Rectangular Mini-Channels." pp. 633-640 . doi:10. 115/ICMM2004-2391
    1. Agarwal, A., Bandhauer, T. M., and Garimella, S. J. I. j. o. r. “Measurement and Modeling of Condensation Heat Transfer in Non-Circular Microchannels,” Vol. 33, No. 6, pp. 1169-1179, 2010.
    2. Del Col, D., Bortolin, S., Cavallini, A. et al., “Effect of Cross Sectional Shape During Condensation in a Single Square Minichannel,” vol. 54, No. 17-18, pp. 3909-3920, 2011. Doi:10.1016/j.expthermflusci.2017.09.009
    3. Derby, M., Lee, H. J., Peles, Y. et al., “Condensation Heat Transfer in Square, Triangular, and Semi-Circular Mini-Channels,” vol. 55, No. 1-3, pp. 187-197, 2012. Doi:10.1016/j.ijheatmasstransfer.2011.09.002
    4. Liu, N., Li, J. M., Sun, J. et al., “Heat Transfer and Pressure Drop During Condensation of R152a in Circular and Square Microchannels,” Vol. 47, pp. 60-67,2013. Doi:10.1016/j.expthermflusci.2017.09.009
    5. Bortolin, S., Da Riva, E., and Del Col, D. J. H. T. E. “Condensation in a Square Minichannel: Application of the VOF Method,” Vol. 35, No. 2, pp. 193-203, 2014.
    6. El Mghari, H., Asbik, M., Louahlia-Gualous, H. et al., “Condensation Heat Transfer Enhancement in a Horizontal Non-Circular Microchannel,” Applied Thermal Engineering, Vol. 64, No. 1-2, pp. 358-370, 2014.
    7. Gu, X., Wen, J., Zhang, X. et al., “Effect of Tube Shape on the Condensation Patterns of R1234ze (E) in Horizontal Mini-Channels,” International Journal of Heat and Mass Transfer, Vol. 131, pp. 121-139, 2019. DOI:10.1016/j.ijheatmasstransfer.2018.09.069
    8. Besharati, F. and Jahanian, O. “Numerical Simulation of Nanofluid Conjugate Heat Transfer in 2D Microchannel under the Influence of a Transverse Magnetic Field:Nanoparticle Diameter, Reynolds Number and Viscous Dissipation Effects,” Journal of Fluid Mechanics and Aerdynamics Imam Housein university, Vol 9, pp 79-100, 2020. (In Persian)
    9. “danfus,” Catalogue of Standard MCHE Condenser, Save Time and Money with MCHE Standard Products Micro-Channel Heat Exchanger, Danfoss Industries Pvt. Ltd., https://www.danfoss.com/.
    10. Ramyar, M. “Investigasion of Gas Fluid in Microchannels” Mechanical Engieering of shahrkord University, 2012. (In Persian)

Files

History

  • Receive Date: 21 September 2022
  • Revise Date: 11 January 2023
  • Accept Date: 03 February 2023
  • Publish Date: 02 March 2023

Share

How to cite

Statistics