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 |
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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.