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Lee, Jaeseon
Innovative Thermal Engineering Lab (ITEL)
Research Interests
  • Energy conversion utilizing renewable/recyclable thermal sources
  • Thermal management of electronics and high heat-flux devices
  • Working fluids characterizing for thermo-fluid physics and systems

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Two-phase flow in high-heat-flux micro-channel heat sink for refrigeration cooling applications: Part I - pressure drop characteristics

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Title
Two-phase flow in high-heat-flux micro-channel heat sink for refrigeration cooling applications: Part I - pressure drop characteristics
Author
Lee, JaeseonMudawar, Issam
Keywords
Micro-channels; Flow boiling; Refrigeration; Pressure drop
Issue Date
2005-02
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.48, no.5, pp.928 - 940
Abstract
Two-phase pressure drop was measured across a micro-channel heat sink that served as an evaporator in a refrigeration cycle. The micro-channels were formed by machining 231 mum wide x 713 mum deep grooves into the surface of a copper block. Experiments were performed with refrigerant R I 34a that spanned the following conditions: inlet pressure of Pi,, = 1.44-6.60 bar, mass velocity of G = 127-654 kg/m(2)s, inlet quality Of X,,in = 0.001-0.25, outlet quality of x(e,out) = 0.49-superheat, and heat flux of q(") = 31.6-93.8W/cm(2). Predictions of the homogeneous equilibrium flow model and prior separated flow models and correlations yielded relatively poor predictions of pressure drop. A new correlation scheme is suggested that incorporates the effect of liquid viscosity and surface tension in the separated flow model's two-phase pressure drop multiplier. This scheme shows excellent agreement with the R I 34a data as well as previous micro-channel water data. An important practical finding from this study is that the throttling valve in a refrigeration cycle offers significant stiffening to the system, suppressing the large pressure oscillations common to micro-channel heat sinks.
URI
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DOI
10.1016/j.ijheatmasstransfer.2004.09.018
ISSN
0017-9310
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