scholarly journals Dimensional optimization of two-phase flow boiling in microchannel heat sinks

2021 ◽  
Vol 5 (3 (Under Construction)) ◽  
pp. 475-483
Author(s):  
Rahım JAFARI
Keyword(s):  
Two Phase Flow ◽  
Flow Boiling ◽  
Heat Sinks ◽  
Phase Flow ◽  
Two Phase ◽  
Microchannel Heat Sinks ◽  
Dimensional Optimization

Two-Phase Flow and Heat Transfer in Rectangular Micro-Channels

2004 ◽  
Vol 126 (3) ◽  
pp. 288-300 ◽  
Author(s):  
Weilin Qu ◽  
Seok-Mann Yoon ◽  
Issam Mudawar
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Flow Pattern ◽  
Two Phase Flow ◽  
Flow Boiling ◽  
Flow Patterns ◽  
Heat Sinks ◽  
Phase Flow ◽  
Micro Channel ◽  
Two Phase

Knowledge of flow pattern and flow pattern transitions is essential to the development of reliable predictive tools for pressure drop and heat transfer in two-phase micro-channel heat sinks. In the present study, experiments were conducted with adiabatic nitrogen-water two-phase flow in a rectangular micro-channel having a 0.406×2.032mm2 cross-section. Superficial velocities of nitrogen and water ranged from 0.08 to 81.92 m/s and 0.04 to 10.24 m/s, respectively. Flow patterns were first identified using high-speed video imaging, and still photos were then taken for representative patterns. Results reveal the dominant flow patterns are slug and annular, with bubbly flow occurring only occasionally; stratified and churn flow were never observed. A flow pattern map was constructed and compared with previous maps and predictions of flow pattern transition models. Features unique to two-phase micro-channel flow were identified and employed to validate key assumptions of an annular flow boiling model that was previously developed to predict pressure drop and heat transfer in two-phase micro-channel heat sinks. This earlier model was modified based on new findings from the adiabatic two-phase flow study. The modified model shows good agreement with experimental data for water-cooled heat sinks.

Two-Phase Stacked Microchannel Heat Sinks for Microelectronics Cooling

2005 ◽  
Vol 2 (2) ◽  
pp. 122-131
Author(s):  
Pradeep Hegde ◽  
K.N. Seetharamu ◽  
P.A. Aswatha Narayana ◽  
Zulkifly Abdullah
Keyword(s):  
Finite Element ◽  
Pressure Drop ◽  
Thermal Resistance ◽  
Heat Sink ◽  
Two Phase Flow ◽  
Heat Sinks ◽  
Phase Flow ◽  
Pumping Power ◽  
Two Phase ◽  
Microchannel Heat Sinks

Stacked microchannel heat sinks with two-phase flow have been analyzed using the Finite Element Method (FEM). The present method is a simple and practical approach for analyzing the thermal performance of single or multi layered microchannel heat sinks with either single or two-phase flow. A unique 10 noded finite element is used for the channel discretization. Two-phase thermal resistance, pressure drop and pumping power of single, double and triple stack microchannel heat sinks are determined at different base heat fluxes ranging from 150 W/cm2 to 300 W/cm2. The temperature distribution along the length of the microchannel is also plotted. It is found that stacked microchannel heat sinks with two-phase flow are thermally more efficient than two-phase single layer microchannel heat sinks, both in terms of thermal resistance and pumping power requirements. It is observed that the thermal resistance of a double stack microchannel heat sink with two-phase flow is about 40% less than that for a single stack heat sink. A triple stack heat sink yields a further 20% reduction in the thermal resistance and at the same time operates with about 30% less pumping power compared to a single stack heat sink. The effect of channel aspect ratio on the thermal resistance and pressure drop of stacked microchannel heat sinks with two-phase flow are also studied.

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