Performance enhancement in double-layer tapered microchannels by changing the wall hydrophobicity and working fluid

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

doi:10.1007/s10973-022-11681-1

Cited by 12 publications

(2 citation statements)

References 42 publications

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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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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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“…Derikvand et al [16] recently showed that the hydrophobicity of walls in a wavy microchannel led to decreased pumping costs as well as increased convective heat transfer. Likewise, Sarvar-Ardeh et al [17] applied hydrophobic and superhydrophobic surfaces to a double-layer micro-heat sink to observe the effects of both thermal jump and slip velocity on the heat transfer of the cooling system. They mentioned that, although increasing the hydrophobicity of the walls decreased the pumping cost, the convection heat transfer behaved differently by changing the flow rate at the inlet due to compromising the effect between the slip velocity and temperature jump (i.e.…”

mentioning

confidence: 99%

Investigation into the effects of hydrophobicity on thermohydraulic characteristics and entropy generation of hybrid nanofluid with the magnetic property in a micro-heat sink under a magnetic field

et al. 2023

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The cooling process of the devices is a big challenge in the electronic industry, and most of the process units (graphical are central) experience defects under harsh temperature conditions, so dissipating generated heat under various working conditions should seriously be studied. This study investigates the magnetohydrodynamics of hybrid-ferro nanofluids in the presence of hydrophobic surfaces in a micro-heat sink. To scrutinize this study, a Finite Volume Method (FVM is applied. The ferro nanofluid includes water as base fluid and Multiwall Carbon Nanotubes (MWCNTs) and Fe3O4 as nano-additives, which are used in three concentrations (0, 1 and 3%). The other parameters such as Reynold number (5-120), Hartmann number (magnitude of the magnetic field from 0 to 6) and hydrophobicity of surfaces are considered to be scrutinized for their impacts on heat transfer and hydraulic variables as well as entropy generation ones. The outcomes indicate that increasing the level of hydrophobicity in surfaces leads to improve heat exchange and reduces the pressure drop simultaneously. Likewise, it decreases the frictional and thermal types of entropy generations. Intensifying the magnitude of the magnetic field enhances the heat exchange as much as the pressure drop. In the same result, it can decrease the thermal term in entropy generation equations for the fluid, but it increases the frictional one and adds a new term named magnetic entropy generation. Incrementing Reynolds number improves the convection heat transfer parameters although it intensifies the pressure drop in the length of the channel. Also, the thermal and frictional kinds of entropy generation decrease and increase with increasing the flow rate (Reynold number).

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A review on the applications of micro-/mini-channels for battery thermal management

Sarvar-Ardeh

Rashidi

Rafee

et al. 2023

J Therm Anal Calorim

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Performance enhancement in double-layer tapered microchannels by changing the wall hydrophobicity and working fluid

Cited by 12 publications

References 42 publications

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

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

Investigation into the effects of hydrophobicity on thermohydraulic characteristics and entropy generation of hybrid nanofluid with the magnetic property in a micro-heat sink under a magnetic field

A review on the applications of micro-/mini-channels for battery thermal management

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