Table 2

Main experimental studies on nanofluid-filled LHPs.

Year Author Nanofluids Nanoparticle concentration (%) Heat input range (W) Main findings
2013 Gunnasergaran et al. [22] SiO2–H2O 3% wt. 20–100 From 28% to 44% decrease in Rth.
2014 Gunnasergaran et al. [23] Al2O3–H2O 0–3% wt. 40 Up to 5.5% decrease in Rth.
2014 Putra et al. [24] Al2O3–H2O 5% wt. 10–30 Up to 56% decrease in Rth when using biomaterial wick compared to sintered powder.
2015 Gunnasergaran et al. [25] SiO2–H2O 0–3% wt 20, 40, 60 The optimum nanoparticle mass concentration is equal to 0.5%.
2015 Wan et al. [26] Cu–H2O 1.0, 1.5, 2% wt. 25–125 Up to 12.8% and 21.7% reductions in Tev and Rth, respectively.
2016 Tharayil et al. [27] Graphene–H2O 0.003, 0.006, 0.009% vol. 20–380 Up to 21.6% decrease in Rth and to 10 °C decrease in Tev obtained for an optimum mass concentration of 0.006% vol.
2017 Gunnasergaran et al. [28] Fe2NiO4–H2O 0–3% wt. 20–60 Up to 5.7 °C decrease in core temperature of the CPU.
2017 Gunnasergaran et al. [29] Diamond–H2O 0–3% wt. 20–60 Up to 10.8% decrease in Rth from 0.5% wt nanoparticle concentration
2018 Akshay et al. [30] Al2O3–H2O 2% wt. 30–310 Up to 12% decrease in Tev.
2018 Wang et al. [31] Cu–H2O 1.5%, 2% wt. 25–100 Up to 60% decrease in Rth for low heat input powers.
2019 Stephen et al. [32] Al2O3–H2O 0.09%, 0.12% vol. 30–500 Up to 34.7% and 20.2% reduction in Rth for 0.12% vol of Ag and Al2O3.
Ag–H2O
2021 Bin Harun et al. [33] Diamond–H2O 0–3% wt. 40, 60, 80 Up to 3% reduction in Rth at 3% mass concentration.
Al2O3–H2O
SiO2–H2O
2022 Riehl and Murshed [34] NiO–H2O 3.5% wt. 10–40 There is a slight improvement when compared to the tests with water.
2022 Veeramachaneni et al. [35] Hybrid Copper–Graphene–H2O (30:70 and 70:30 ratios) 0.01%, 0.02% vol. 40–320 Up to 24.4% and 10% decrease in Rth and Tev, respectively.
Up to 37% increase in capillary limit.

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