Experimental Investigation of Sub-Cooled Flow Boiling in Metallic Microchannel | ||
Engineering and Technology Journal | ||
Article 5, Volume 37, 10A, October 2019, Pages 408-415 PDF (665.58 K) | ||
Document Type: Research Paper | ||
DOI: 10.30684/etj.37.10A.5 | ||
Authors | ||
Suha A. mohammed1; Ekhlas Mohammed Fayyadh2 | ||
1Mechanical Engineering Department, University of Technology - Iraq | ||
2Mechanical Engineering Department, Baghdad,Iraq | ||
Abstract | ||
Experiments in microchannel heat sink were carried that examine the deionized water two-phase boiling heat transfer. The heat sink consisted of a single microchannel having 300μm wide nominal dimensions and 300μm height (hydraulic diameter of 300μm). The heat sink formed of oxygen-free copper with 72mm length and 12mm width. Experimental operation conditions spanned the heat flux (78-800) kW/m2, mass flux (1700 and 2100) kg/m2.s at 31K subcooled inlet temperature. The boiling heat transfer coefficient is measured, and compared with existing correlations. The results show that higher mass flux leads to a higher boiling heat transfer coefficient and the dominants mechanism is convective boiling. In addition, it was found that an existing correlation provides a satisfactory prediction of the heat transfer coefficient. | ||
Keywords | ||
Metallic Microchannel; Two phase flow; Subcooled flow boiling; Heat transfer coefficient | ||
References | ||
[1] J. Lee and I. Mudawar, “Two-phase flow in high heat flux microchannel heat sink for refrigeration cooling applications: Part II-heat transfer characteristics,” International Journal of Heat and Mass Transfer, 48, 941- 955, 2005. [2] L.S. Tong and Y.S. Tang, “Boiling Heat Transfer and Two-Phase Flow,” Second Edition, Taylor & Francis Ltd. London, 1997. [3] J.G. Collier and J.R. Thome, “Convective boiling and condensation,” 3rd Edition (1994) Oxford Science Publications 1-33, 131-182, 183-213, 325-374, 1994. [4] X.F. Peng and B.X. Wang, “Forced convection and flow boiling heat transfer for liquid flowing through microchannels,” International Journal of Heat and Transfer, 36, 3421-3427, 1993. [5] W. Qu and I. Mudawar, “Flow boiling heat transfer in two-phase micro-channel heat sinks––I,” Experimental investigation and assessment of correlation methods, International Journal of Heat and Mass Transfer, 46, 2755- 277, 2003. [6] E. Galvis and R. Culham, “Measurements and flow pattern visualizations of two-phase flow boiling in single channel microevaporators,” International Journal of Multiphase Flow, 42, 52-61, 2012. [7] R. Mehmed, M. Mohamed and G. Tassos, “Flow boiling heat transfer in a rectangular copper microchannel,” Journal of Thermal Engineering, 2, 2, 2016. [8] S. Krishnamurthy and Y. Peles, “Flow boiling heat transfer on micro pin fins entrenched in a microchannel,” J. Heat Transfer 132, 4, 04-07, 2010. [9] C. Martín-Callizo and B. Palm, “Subcooled flow boiling of R 134a in vertical channels of small diameter,” International Journal of Multiphase Flow 33, Issue 8, 822- 832, 2007. [10] R.J. Phillips, “Forced convection, Liquid Cooled, Microchannel Heat sinks,” MSc thesis, Massachusetts Institute of Technology, Cambridge, USA, 1987. [11] R.K. Shah and A.R. London, “Laminar flow forced convection in ducts,” Oxford Academic Press, New York, USA, Supplement 1 to Advances Heat Transfer, 1978. [12] R.K. Shah, “A correlation for laminar hydrodynamics entry length solution for circular and non circular ducts,” Journal of Fluids Engineering, 100, 177-179, 1978. [13] M. Mirmanto, “Single-phase flow and flow boiling of water in horizontal rectangular microchannels,” Ph.D. thesis, Brunel University London. UK, 2012. [14] B. Markal, O. Aydin and M. Avci, “Effect of aspect ratio on saturated flow boiling in microchannels,” International Journal of Heat and Mass Transfer, 93:130- 143, 2016. [15] D. Y. Liu, X. Weng and X. Guang, ”Experimental study on the heat transfer coefficient of water flow boiling in mini/ microchannels,” Experimental Thermal and Fluid Science, 35, Issue 7, 1392-1397, 2011. [16] M.M. Mahmoud & T.G. Karayiannis, “Heat Transfer Correlation For Flow Boiling In Small To Micro Tubes,” Int. J. of Heat and Mass Transfer, 66, 553-574, 2013. | ||
Statistics Article View: 230 PDF Download: 183 |