Document Type : Research Paper
Authors
1 Mechanical Engineering Department, University of Technology - Iraq
2 Mechanical 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
Main Subjects
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.
)
