Heat transfer enhancement in microchannel heat sinks with periodic expansion–constriction cross-sections

Flow and heat transfer characteristics in convergent-divergent shaped microchannel with ribs and cavities

“…In another paper Alfaryjat et al [17] investigated effects of hexagonal, circular and rhombus shape and showed that hexagonal cross-section had better heat transfer characteristics among other shapes. Chai et al [18] considered multi-channel effect, entrance effect and viscous heating in periodic expansion-constriction cross sectional microchannel and observed a good agreement in predictions of apparent friction factor and Nusselt number with experimental data. Sheikhalipour et al [19] investigated the effects of aspect ratio and viscous dissipation on Nu in trapezoidal microchannels and verified their results with conventional theory.…”

Numerical study of laminar flow and heat transfer in microchannel heat sink with offset ribs on sidewalls

“…Based on the performance factor introduced, the superiority of converging-diverging design showed itself at higher Reynolds number for which higher performance of up to 20% was observed. Chai et al [14] experimentally and numerically studied the heat transfer performance of microchannel heat sink with periodic expansion-constriction cross-sections. They found the maximum of performance evaluation criteria 1.8 at Reynolds number ranged from 147 to 752.…”

“…Validations of heat transfer and friction factor of the smooth microchannel heat sink are performed by comparing with the experimental values obtained from Chai et al[14] as shown in Figs. 4a and b.…”

A comparison of micro-structured flat-plate and cross-cut heat sinks for thermoelectric generation application

“…They investigated effect of total pumping power on the performance of the proposed design, where they showed that the maximum temperature difference on the bottom wall is reduced by 37.5% compared to the original design of double-layered microchannel heat sinks for the same pumping power. Chai et al [4] proposed a newly microchannel heat sink with periodic expansion-constriction cross section that can enhance the average Nusselt number and reduce thermal resistance of the heat sink. Bifurcation of the channels also enhances thermal performance in microchannel heat sinks [5].…”