scholarly journals Review on two-phase flow boiling in oblique fined microchannel heat sink with different channel cross section

2018 ◽  
Keyword(s):  
Cross Section ◽  
Heat Sink ◽  
Two Phase Flow ◽  
Flow Boiling ◽  
Channel Cross Section ◽  
Phase Flow ◽  
Microchannel Heat Sink ◽  
Two Phase

Computational Method for Characterization of a Microchannel Heat Sink Involving Two-Phase Flow

2005 ◽  
Author(s):  
Kanchan M. Kelkar ◽  
Suhas V. Patankar ◽  
Sukhvinder Kang
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Two Phase Flow ◽  
Phase Region ◽  
Heat Fluxes ◽  
Computational Method ◽  
Phase Flow ◽  
Microchannel Heat Sink ◽  
Two Phase ◽  
Solid Region

Microchannel heat sinks are being increasingly considered for the cooling of electronic equipment because of their ability to absorb high heat fluxes directly from the heat-dissipating components in a compact manner with a low thermal resistance. In this study, a computational method is presented for the analysis of conjugate heat transfer and two-phase flow in a heat sink containing a single microchannel. It involves a two-domain solution of the three-dimensional conduction within the solid region and the one-dimensional two-phase momentum and energy transfer within a microchannel. The nonlinear coupling between the two domains that occurs through the heat exchange at the walls of the microchannels is handled using an iterative calculation. Analysis of the flow and heat transfer in the microchannel is based on the homogenous flow assumption that is deemed to be accurate for the flow of low surface tension coolants such as methanol, isobutane, and HFC’s. Representative single and two-phase correlations are used for the calculation of the friction factor and the heat transfer coefficient. The computational model is applied for the prediction of the performance of a microchannel heat sink over a range of mass flow rates. The results of the analysis show the important physical effects that govern the performance of the microchannel heat sink involving two-phase flow. These include the acceleration of the flow in the microchannel in the two-phase region that influences the pressure drop through it and the two-phase enhancement of heat transfer that determines the temperature field within the solid region.   This paper was also originally published as part of the Proceedings of the ASME 2005 Heat Transfer Summer Conference.

scholarly journals Experimental Investigation of Non-Uniform Heating on Flow Boiling Instabilities in a Microchannels Based Heat Sink

2009 ◽  
Author(s):  
D. Bogojevic ◽  
K. Sefiane ◽  
A. J. Walton ◽  
H. Lin ◽  
G. Cummins ◽  
...  
Keyword(s):  
Heat Sink ◽  
Two Phase Flow ◽  
Flow Boiling ◽  
High Heat ◽  
High Heat Flux ◽  
Phase Flow ◽  
Central Processor ◽  
Back Side ◽  
Uniform Heating ◽  
Two Phase

Two-phase flow boiling in microchannels is one of the most promising cooling technologies able to cope with high heat fluxes generated by the next generation of central processor units (CPU). If flow boiling is to be used as a thermal management method for high heat flux electronics it is necessary to understand the behaviour of a non-uniform heat distribution, which is typically the case observed in a real operating CPU. The work presented is an experimental study of two-phase boiling in a multi-channel silicon heat sink with non-uniform heating, using water as a cooling liquid. Thin nickel film sensors, integrated on the back side of the heat sinks were used in order to gain insight related to temperature fluctuations caused by two-phase flow instabilities under non-uniform heating. The effect of various hotspot locations on the temperature profile and pressure drop has been investigated, with hotspots located in different positions along the heat sink. It was observed that boiling inside microchannels with non-uniform heating led to high temperature non-uniformity in transverse direction.

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