| Summary: | 碩士 === 國立成功大學 === 機械工程學系 === 103 === In present study, a C-shaped channel is selected as geometry of the chaotic channel, and the nanofluid at various particle concentrations are simulated by single and two-phase model in the laminar flow. The parameters studied include Reynolds number, nanoparticle volume concentration, the dimensionless depth, the dimensionless height and the dimensionless width.
The laminar heat transfer enhancement using nanofluid in a chaotic flow is validated with the available in the literature first, the maximum discrepancy within 3%, and then further extend to design the C-shaped geometry. Numerical simulations reveal that the combination of nanofluid and chaotic channel can be an effective way to increase the effect of heat transfer. The results show that single-phase and two-phase models predict almost identical hydrodynamic fields but very different for thermal field. In addition, the multi-parameter constrained optimization procedure integrating the design of experiments (DOE), response surface methodology (RSM), genetic algorithm (GA) and computational fluid dynamics (CFD) is proposed to design the nanofluid laminar convection of three-dimensional C-shaped channel. The numerical optimization indicates that the enhancement of the objective function E can achieve 16% and 22% with single and two-phase models, respectively.
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