Experimental investigation for sequential triangular double-layered microchannel heat sink with nanofluids

Ahmed, Hamdi E.; Musse, Mohamud Ahmed; Seder, Islam; Salman, B.H.

doi:10.1016/j.icheatmasstransfer.2016.06.010

Cited by 71 publications

(12 citation statements)

References 37 publications

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“…The heat transfer coefficient was calculated using Equation (3) according to [91,92], where m is the mass flow rate, c p is the specific heat capacity, T out and T in are the fluid inlet and outlet temperature, and T s and T f are the cooling pad temperature and average fluid temperature, respectively.…”

Section: Pulsating Flow On Cpv Coolingmentioning

confidence: 99%

Cooling of Concentrated Photovoltaic Cells—A Review and the Perspective of Pulsating Flow Cooling

2023

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This article presents a review to provide up-to-date research findings on concentrated photovoltaic (CPV) cooling, explore the key challenges and opportunities, and discuss the limitations. In addition, it provides a vision of a possible future trend and a glimpse of a promising novel approach to CPV cooling based on pulsating flow, in contrast to existing cooling methods. Non-concentrated photovoltaics (PV) have modest efficiency of up to around 20% because they utilise only a narrow spectrum of solar irradiation for electricity conversion. Therefore, recent advances employed multi-junction PV or CPV to widen the irradiation spectrum for conversion. CPV systems concentrate solar irradiation on the cell’s surface, producing high solar flux and temperature. The efficient cooling of CPV cells is critical to avoid thermal degradation and ensure optimal performance. Studies have shown that pulsating flow can enhance heat transfer in various engineering applications. The advantage of pulsating flow over steady flow is that it can create additional turbulence and mixing in the fluid, resulting in a higher heat transfer coefficient. Simulation results with experimental validation demonstrate the enhancement of this new cooling approach for future CPV systems. The use of pulsating flow in CPV cooling has shown promising results in improving heat transfer and reducing temperature gradients.

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Section: Pulsating Flow On Cpv Coolingmentioning

confidence: 99%

Cooling of Concentrated Photovoltaic Cells—A Review and the Perspective of Pulsating Flow Cooling

2023

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“…Levac et al [32] assessed single-layer and double-layer channels. Ahmed et al [33] performed experiments on rectangular and triangular heat sink of aluminium substrate using nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Performance Enhancement of Double-Layer Microchannel Heat Sink by Employing Dimples and Protrusions on Channel Sidewalls

Pandey

Paul

2022

Mathematical Problems in Engineering

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High-temperature gradient causes thermal stress and is indirectly responsible for other demerits in nonstacked microchannels. High-temperature gradient is overcome by employing double layers in the heat sink. Utilization of dimple and protrusion in such double-layered sink to enhance overall performance is done in the present numerical study. Before placement of dimples and protrusions on sidewalls of the sink, optimum width and depth of channel have been assessed. Microsinks with the protruded-dimpled bottom layer and microsinks with protruded-dimpled layers are investigated. The parameters such as maximum bottom wall temperature difference (ΔTb), Nusselt number ratio (Nu/Nuo), and thermal performance factor (η) have been evaluated. The impact of aligned and staggered arrangements of dimple and protrusion is also compared. Deionized water as a coolant for the range of Reynolds number of 89–924 is examined. It has been realized that aligned models offer higher heat transfer coefficient, maximum Nu, and minimum ΔTb, but in terms of overall performance, staggered sinks are superior. The heat sink with both layers protruded and dimpled, showing Nu/Nuo and η of 1.36 and 1.32, respectively, is observed as one of the optimum sinks which offers an excellent lowest ΔTb of 1.48 K.

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“…Since future technology demands for a greater heat removal, numerous researches have been done to improve the capability of the MCHS. Base materials (Ijam & Saidur, 2012;Peyghambarzadeh et al, 2014;Yang et al, 2019;Yang et al, 2020), fluid flow alteration (Zhai et al, 2016a;Zhai et al, 2016b;Shen et al, 2018;Jiang et al, 2020) and mixing with inserts (Bahiraei et al, 2019), microchannel shape and layout (Ahmed et al, 2016;Wong & Ang, 2017;Hemmat Esfe et al, 2017;Arani et al, 2017;Hajmohammadi & Toghraei, 2018), complex design of microchannels walls (Chai et al, 2013;Sakanova et al, 2015;Ma et al, 2017;Duangthongsuk & Wongwises, 2017;Shen et al, 2018;Sarlak et al, 2019), pin-fin hybrid (Alfellag et al, 2019;Soleymani et al, 2020;Zeng et al, 2020), implementation of manifolds (Pourfattah et al, 2019;Lin et al, 2021), jet injection (Jalali et al, 2019), double layers (Arani et al, 2017) and more have been consistently being explored to improve the performance of the MCHS. Additionally, Mohammed et al (2010) stated that the conventional method using gas, air and water as coolant for a MCHS will no longer be able to address future heating issue to remove as minimum as 1000W/cm 2 .…”

Section: Introductionmentioning

confidence: 99%

Effects of surfactant and nanofluid on the performance and optimization of a microchannel heat sink

Shamsuddin

Estellé

Navas

et al. 2021

International Journal of Heat and Mass Transfer

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This paper reports the influence of surfactant Triton X-100 on boron nitride nanotubes (BNNTs) nanofluid in non-optimized and optimized microchannel heat sink (MCHS) at 30⁰ C and 50⁰ C. The MCHS performance was evaluated in terms of thermal resistance and pressure drop, utilizing experimental thermophysical properties of distilled water, a mixture of distilled water and surfactant Triton X-100 as base fluid, and nanofluid BNNTs at weight concentration of 0.001% into MCHS models which further optimized with the Multiple Objective Particle Swarm Optimization (MOPSO) technique. It is found that the surfactant at 30⁰ C improves MCHS thermal capabilities without nanotubes by 0.8% even after optimizing MCHS according to the fluid properties. Conversely, surfactant Triton X-100 reduces pressure drop greatly with any change in thermal resistance at 50⁰ C and paired cooperatively with BNNTs nanofluid 0.001wt.% -mitigating pressure drop increment caused by the nanofluid resulting an overall performance improvement by 1.25% and 1.97% for thermal resistance and pressure drop respectively in MCHS systems and reduced to 1.3% and 3.2% after optimization. Optimized MCHS dimensions given by MOPSO could be manufactured and additionally gave wider solutions for large reduction of pressure drop up to 80% for economic MCHS with a drawback of higher thermal resistance.

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Experimental investigation for sequential triangular double-layered microchannel heat sink with nanofluids

Cited by 71 publications

References 37 publications

Cooling of Concentrated Photovoltaic Cells—A Review and the Perspective of Pulsating Flow Cooling

Cooling of Concentrated Photovoltaic Cells—A Review and the Perspective of Pulsating Flow Cooling

Performance Enhancement of Double-Layer Microchannel Heat Sink by Employing Dimples and Protrusions on Channel Sidewalls

Effects of surfactant and nanofluid on the performance and optimization of a microchannel heat sink

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