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. 2021 Dec 17;11:24167. doi: 10.1038/s41598-021-03514-2

Table 2.

Extent of heat load cooling and average ferrofluid velocity for various ferrite nanoparticle-based ferrofluids.

Materials Bulk Ms (kA/m) T0 = 60 °C,
Q = 0.6 kW/m2
T0 = 100 °C,
Q = 1.2 kW/m2
T0 = 150 °C,
Q = 1.9 kW/m2
T0 = 200 °C,
Q = 2.6 kW/m2
ΔT (°C) v (mm/s) ΔT (°C) v (mm/s) ΔT (°C) v (mm/s) ΔT (°C) v (mm/s)
Mn0.3Zn0.7Fe2O4 94 6 0.68 14 0.86 27 1.12 41 1.47
ZnFe2O4 111.7 7.2 0.77 18.6 0.94 34.6 1.09 54 1.23
MgFe2O4 120.2 8.5 0.87 20.02 1.18 36.3 1.74 55.2 2.53
Mn0.4Zn0.6Fe2O4 145.7 11.5 1.2 24 1.52 46.4 2.24 71 2.82
Mn0.5Zn0.5Fe2O4 164.5 14.35 1.62 29.4 1.94 45.4 2.52 82.5 4.74
NiFe2O4 175 15.77 1.62 33.9 2.07 58.3 2.84 84.6 3.93
CuFe2O4 256.3 18.6 2.11 36.6 2.39 60.8 2.95 93.6 3.93
CuNiFe2O4 258.2 20.1 2.89 38.4 3.51 69.5 4.01 95.2 3.94
Co0.6Zn0.4Fe2O4 310 19.5 2.36 33.75 2.58 67.77 4.27 103.7 5.8
γ-Fe2O3 397.5 22.8 3.86 42.05 3.91 78.8 5.83 117.1 6.8
MnFe2O4 406.7 22.15 3.13 32.5 3.42 72.5 4.08 110 4.98
Co0.8Zn0.2Fe2O4 425 23.1 3.19 46.6 3.48 74.57 3.89 104 4.41
Fe3O4 446 24 3.796 47 4.036 77 4.512 111 5.43
CoFe2O4 455 24 4.11 47 4.27 74.5 4.79 118.6 6.43

T0 = bare heat load temperature, Q = applied heat flux, ΔT = heat load cooling, v = average ferrofluid velocity.