Experimental and Numerical Study of Methanol-Water Mixture Single-Phase Heat Transfer in a Micro-Channel Heat Sink

2012 ◽  
Author(s):  
Chun K. Kwok ◽  
Matthew M. Asada ◽  
Jonathan R. Mita ◽  
Weilin Qu
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Sink ◽  
Single Phase ◽  
Numerical Study ◽  
Pure Water ◽  
Molar Fraction ◽  
Water Mixture ◽  
Micro Channel ◽  
Numerical Predictions

This paper presents an experimental study of single-phase heat transfer characteristics of binary methanol-water mixtures in a micro-channel heat sink containing an array of 22 microchannels with 240μm × 630μm cross-section. Pure water, pure methanol, and five methanol-water mixtures with methanol molar fraction of 16%, 36%, 50%, 63% and 82% were tested. Key parametric trends were identified and discussed. The experimental study was complemented by a three-dimensional numerical simulation. Numerical predictions and experimental data are in good agreement with a mean absolute error (MAE) of 0.87%.

Three-Dimensional Analysis of Fluid Flow and Heat Transfer in Single- and Two-Layered Micro-Channel Heat Sinks

2008 ◽  
Author(s):  
M. L.-J. Levac ◽  
H. M. Soliman ◽  
S. J. Ormiston
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Numerical Study ◽  
Three Dimensional ◽  
Heat Sinks ◽  
Micro Channel ◽  
Flow Conditions ◽  
Flow And Heat Transfer ◽  
Computer Chips ◽  
Laminar Flow Conditions

Micro-channel heat sinks are currently at the forefront of cooling technologies for computer chips where the input heat flux is projected to exceed 100 W/cm2 [1, 2]. The quest for better heat-sink designs has produced different ideas, one of which is the idea of using multi-layered micro-channel heat sinks [3, 4]. The objectives of the present investigation were to conduct a detailed numerical study of the hydrodynamic and thermal behavior of a two-layered micro-channel heat sink and to compare the performance of the two-layered heat sink with that of a single-layered sink under laminar flow conditions.

Numerical study of single-phase heat transfer performance of a mini/micro-channel integrated with multiple bypass micro-nozzles

2020 ◽  
pp. 1-40
Author(s):  
Raamkumar Loganathan ◽  
Sateesh Gedupudi
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Temperature Distribution ◽  
Pressure Drop ◽  
Wall Temperature ◽  
Single Phase ◽  
Numerical Study ◽  
Micro Channel ◽  
Temperature Uniformity ◽  
The Third

Abstract Surface temperature uniformity is an important factor in the thermal management of electronics. The present numerical study investigates the influence of multiple bypass injections on the wall temperature distribution of a single-phase mini/micro-channel. The proposed scheme consists of sending a fraction of the coolant through the channel inlet and injecting the remaining coolant through multiple bypass inlets on top of the channel positioned at different axial locations. The study explores four different configurations: the first one being three equispaced bypass inlets of uniform diameter, the second one being three equispaced bypass inlets of varying diameter, the third one being five equispaced bypass inlets of varying diameter, and the fourth one being five bypass inlets, but with three equispaced bypass inlets of varying diameter and the last two bypass inlets of the same diameter as that of the third inlet. The influence of bypass percentage on the thermal performance is evaluated. The fourth configuration results in a near uniform wall temperature distribution, with 82-89% reduction in the wall temperature non-uniformity compared to the no-bypass case. The reductions for the third, second and first configurations are 65-71%, 53-76% and 54-74%, respectively. The third configuration results in an average heat transfer coefficient enhancement of up to 34%. On the whole, the improvement in the wall temperature uniformity is higher than the increase in the pressure drop, and the increase in the channel heat transfer coefficient is higher than pressure drop for some cases.

Numerical Simulation of Multi-Layer Rectangle Micro-Channel Heat Sink for Single-Phase Flow and Heat Transfer

2013 ◽  
Vol 444-445 ◽  
pp. 1460-1465
Author(s):  
Li Feng Wang ◽  
Bao Dong Shao ◽  
He Ming Cheng ◽  
Ying He
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Single Phase ◽  
Discrete Control ◽  
Maximum Temperature ◽  
Phase Flow ◽  
Micro Channel ◽  
Single Phase Flow ◽  
Maximum Temperature Difference ◽  
Flow And Heat Transfer

The single-phase flow and heat transfer for multi-layer rectangle micro-channel heat sink are numerically simulated. During the simulation, Finite Volume Method (FVM) was used to solve Computational Fluid Dynamics (CFD) problem. First order upwind scheme was used to discrete control equations, and semi-implicit method for pressure-linked equations was used to solve discretization equations. The maximum temperature difference is 76.2362 °C, and the total thermal resistance is 0.4765 °C/W, which agrees well with the result of analysis result 0.5145 °C/W. The corresponding pressure drop is about 54.1360 N/m2.

A numerical study of the hydro-thermal behaviour of nanofluids in rectangular microchannels using a mixture model

2011 ◽  
Vol 225 (4) ◽  
pp. 791-798 ◽  
Author(s):  
H Aminfar ◽  
R Maroofiazar
Keyword(s):  
Heat Transfer ◽  
Mixture Model ◽  
Single Phase ◽  
Numerical Study ◽  
Pure Water ◽  
Convection Heat Transfer ◽  
Phase Model ◽  
Convection Heat ◽  
Rectangular Microchannel ◽  
The Difference

In this article, laminar flow and convection heat transfer of wateralumina nanofluid in a rectangular microchannel have been investigated numerically. Because of the existence of slip velocity between nanoparticles and base fluid, the mixture model is used and results are compared with the single-phase model. The results indicate that using nanofluids can enhance convective heat transfer and pressure drop in a microchannel in comparison with pure water. Also, the enhancement of convection heat transfer is higher in the developing region and the difference of the mixture model and single-phase model is slightly great in this region, but in fully developed region the differences are very low.

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