Viscous dissipation effect on CuO-Water nanofluid-cooled microchannel heat sinks

Partial filling of porous medium insert in a channel alleviates the tremendous pressure drop associated with a porous medium saturated channel, and enhances heat transfer at an optimum fraction of porous medium filling. This study pioneered an investigation into the viscous dissipative forced convective heat transfer in a parallel-plate channel, partially occupied with a porous medium at the core, under local thermal non-equilibrium condition. Solving the thermal energy equation along the Darcy–Brinkman equation, new exact temperature fields and Nusselt number are presented under symmetrical isoflux thermal boundary condition. Noteworthy is the heat flux bifurcation at the interface between the clear fluid and porous medium driven by viscous dissipation, in cases where the combined hydrodynamic resistance to fluid flow and thermal resistance to fluid conduction is considerable in low Darcy number porous medium insert. However, viscous dissipation does not affect the qualitative variation of the Nusselt number with the fraction of porous medium filling. By using Al2O3-Water nanofluid as the working fluid in a uniformly heated microchannel, partially filled with an optimum volume fraction of porous medium, the heat transfer coefficient improves as compared to utilizing water. The accompanied viscous dissipation however has a more adverse impact on the heat transfer coefficient of nanofluids with an increasing Reynolds number.

show abstract

“…The thermophysical properties of Al 2 O 3 nanoparticles, obtained from the correlations in [ 43 ] with a

of 40 nm are given in Table 4 .…”

Section: Resultsmentioning

confidence: 99%

The Thermal Performance Analysis of an Al2O3-Water Nanofluid Flow in a Composite Microchannel

2022

View full text Add to dashboard Cite

show abstract

“…Mei et al 36 analyzed the thermal properties of Fe 3 O 4 ‐water nanofluids in a bellow under different magnetic fields and showed that the high mass fraction nanoparticles have a very positive effect in enhancing heat transfer. Chen et al 37 used CuO‐water nanofluids as a coolant to analyze the viscous dissipation influence on cooling performance and showed that viscous dissipation is detrimental to thermal convection at the heating boundary and increases the temperature gradient near the adiabatic boundary. Akram et al 38 found that an increase in nanoparticle concentration effectively improves the ability of the curved microchannel heat sink to dissipate heat.…”

Section: Introductionmentioning

confidence: 99%

Influence of nanoparticle and channel arc structure on comprehensive performance of nanofluids in curved tiered microchannel heat sinks

Wang

2022

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

In order to improve the heat dissipation of the electrical components, a curved tiered microchannel heat sink (TMCHS) was proposed and optimized and applied to cool the electrical components together with nanofluids. Influence of channel radian (φ = 0°, 75°, 135°, 180°), arc number (n = 0, 2, 3, 4), and nanoparticle concentration (w = 0.0%, 0.1%, 0.3%, 0.5%) on flow and heat transfer characteristics of nanofluids in curved TMCHS was numerically investigated. Comprehensive evaluation coefficient comprehensive evaluation factor (PEC) was used to evaluate the thermo‐hydraulic performance of TMCHS and nanofluids. Results indicated that the greater the radian and arc number, the better the thermal performance of TMCHS. The overall performance of TMCHS is the best when the radian is 180° and the arc number is 4. Results in this paper provide important technical guidance for the application of curved tiered microchannel heat sinks and nanofluids to the field of thermal management of electronic components.

show abstract

“…The application of nanofluid as a cooling medium is one of the major branches of research. In this line of study, the heat transfer characteristics of various nanofluids in microchannels have been studied, including Al 2 O 3 [ 20 ], CuO [ 21 ], TiO 2 [ 22 ], Cu-Al 2 O 3 [ 23 ], and ZnO nanofluid [ 24 ]. Chein and Chuang [ 25 ] studied the performance of a microchannel radiator with a CuO-H 2 O mixed coolant.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Thermal and Hydraulic Performance of Supercritical CO2 and Water in Microchannels Based on Entropy Generation

Zeng

2022

Entropy

View full text Add to dashboard Cite

The excellent thermophysical properties of supercritical CO2 (sCO2) close to the pseudocritical point make it possible to replace water as the coolant of microchannels in application of a high heat flux radiator. The computational fluid dynamics (CFD) method verified by experimental data is used to make a comparison of the thermal hydraulic behavior in CO2-cooled and of water-cooled microchannels. The operation conditions of the CO2-based cooling cases cover the pseudocritical point (with the inlet temperature range of 306~320 K and the working pressure of 8 MPa), and the water-based cooling case has an inlet temperature of 308 K at the working pressure of 0.1 MPa. The channel types include the straight and zigzag microchannels with 90°, 120°, and 150° bending angles, respectively. The analysis result shows that, only when the state of CO2 is close to the pseudocritical point, the sCO2-cooled microchannel is of a higher average heat convection coefficient and a lower average temperature of the heated surface compared to the water-cooled microchannel. The entropy generation rate of the sCO2-cooled microchannel can reach 0.58~0.69 times that of the entropy generation rate for the water-cooled microchannel. Adopting the zigzag structure can enhance the heat transfer, but it does not improve the comprehensive performance represented by the entropy generation rate in the sCO2-cooled microchannel.

show abstract

Viscous dissipation effect on CuO-Water nanofluid-cooled microchannel heat sinks

Cited by 16 publications

References 59 publications

The Thermal Performance Analysis of an Al2O3-Water Nanofluid Flow in a Composite Microchannel

The Thermal Performance Analysis of an Al2O3-Water Nanofluid Flow in a Composite Microchannel

Influence of nanoparticle and channel arc structure on comprehensive performance of nanofluids in curved tiered microchannel heat sinks

Comparative Study of the Thermal and Hydraulic Performance of Supercritical CO2 and Water in Microchannels Based on Entropy Generation

Contact Info

Product

Resources

About