Effects of convergence and superhydrophobicity on the hydrothermal features of the tapered double-layer microchannel

Sarvar-Ardeh, Sajjad; Rafee, Roohollah; Rashidi, Saman

doi:10.1016/j.ijthermalsci.2022.107745

Cited by 13 publications

(1 citation statement)

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“…Further, several modifications are done to improve the thermal and hydraulic efficiency of the DL-MCHS. The modifications are mainly done in the geometry like incorporating ribs and grooves, 15,16 wavy walls, 17,18 deflectors, 19 pin-fins, 20,21 porous media, [22][23][24] and tapered channels [25][26][27][28][29] to disrupt the thermal boundary layer growth, thereby enhancing the cooling rate. However, simultaneously, these lead to greater pressure losses in comparison to a conventional straight channel, leading to a rise in required input pumping power, which is not desirable.…”

Section: Introductionmentioning

confidence: 99%

Modulating fluid rheology and confinement toward augmenting the performance of a double layered microchannel heat sink

Kumar,

Das,

Bakli

2024

Heat Trans

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The improvement of the cooling performance of liquid‐cooled microchannel heat sinks used for densely packed electronic circuits is sorted via passive techniques like tuning substrate or coolant properties. We propose a design for enhancing heat sink performance by simulataneously modifying the channel geometry and tuning the fluid rheology. By modeling the coolant as a power law fluid, its rheological behavior is varied ranging from shear‐thinning to shear‐thickening, alongside Newtonian fluid. We introduced tapering to the middle wall that separates the bottom and top channels of a double layered microchannel heat sink (DL‐MCHS), causing both channels to converge. This convergence not only increases the flow velocity within the downstream microchannel but also reduces the apparent viscosity of the shear‐thinning fluid being subjected to shear, resulting in enhanced thermal and hydraulic performance. We analyze the results from both the first and the second law of thermodynamics context, demonstrating that a tapered DL‐MCHS with shear‐thinning fluid outperforms a straight partition wall DL‐MCHS with Newtonian coolant. However, we also discovered that extreme tapering compromises thermodynamic viability, but by fine‐tuning the extent of tapering, we inferred that a DL‐MCHS with shear‐thinning fluid can become viable with little compromise in the thermal performance.

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