Publication

Effects of streamwise conduction on thermal performance of nanofluid flow in microchannel heat sinks

Ting T.W., Hung Y.M., Guo N., Energy Conversion and Management 78 (2014) 14–23, 2014

Effects of streamwise conduction on the thermal performance of nanofluid flow in microchannel heatsinks under exponentially decaying wall heat flux are investigated. By employing the first-law principles, models with and without streamwise conduction term in the energy equation are developed for hydrodynamicallyfully-developed flow. Closed-form solutions are obtained and the analysis emphasizes onthe details of discrepancy induced by streamwise conduction between the two models on the heat transportcharacteristics in nanofluids. The effects of the variations of Peclet number and nanoparticle volumefraction on the thermal characteristics of nanofluid flow in microchannel heat sinks are analyzed anddiscussed. Due to the tremendous increase in the effective thermal conductivity, the streamwise conductioneffect is justified to be more significant in the nanofluid compared to its base fluid. The significance ofthe streamwise conduction which is prevalent in low-Peclet-number flow is greatly amplified when thevolume fraction of nanoparticle is increased. At low Peclet number, the contribution of the streamwiseconduction in nanofluid is found to be more than twofold of that in its base fluid. The effect of streamwiseconduction on the nanofluid flow in microchannel heat sink is significant albeit not dominant particularlyfor low Peclet number and high nanoparticle volume fraction of the nanofluid.


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