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ABSTRACT
The current research is focused on the cooling of a hot moving steel plate by using air atomized spray cooling technique. A new type of coolant, Cu-Al LDH nanofluid, has been prepared and used for heat flux removal. Preparation method of nanofluid and its characteristics has been reported. The cooling effectiveness is reported in terms of cooling rate by varying the concentration of nanofluid in five levels. The results indicate that the cooling rate increases at very low concentration of LDH with respect to base fluid. However, beyond a certain concentration a decreasing trend of cooling rate has been observed.
Abbreviations: CHF: Critical heat flux; HTC: Heat transfer coefficients; LDH:Layered double hydroxide; TEM: Transmission electron microscopy.
Nomenclature
| Cp | = | Specific heat capacity (502 J.Kg−1.K−1) |
| h | = | Heat transfer coefficient (W.m−2.K−1) |
| k | = | Thermal conductivity of the steel plate (16.2 W. m−1. K−1) |
| q | = | Surface heat flux (W/m2) |
| t | = | Time (sec) |
| T | = | Surface temperature (°C) |
| TC1 | = | Thermocouple one |
| TC2 | = | Thermocouple two |
| TC3 | = | Thermocouple three |
| Tf | = | Fluid temperature (°C) |
| X | = | direction along the length of the plate (mm) |
| Y | = | direction along the thickness of the plate (mm) |
Greek
| ∆t | = | Time step (0.1 sec) |
| ρ | = | Density of the steel plate (8000 kg/m3) |
