Experimental investigation in charge superposition principle determination of free convection heat transfer coefficient in aqueous solution containing different concentration of salt around a cylinder with constant heat flux

Author(s): Alireza Pakdel*, Sadaf Valinejad

The aimof his research is design of laboratory instrument. So, this investigation provides guidelines for the laboratory tests to measure the free heat transfer coefficient of a cylinder which is released to the environment of different electrolyte solutionswith different concentrations. First, a special laboratory device designed and calibrated to be made. The used electrolyte solution samples of sodium chloride are with different concentrations of 10, 20, 40, 60, 80 and 100%asmass percent. Second, experimental curves are drawn in each case which showNusselt numbers according to Rayleigh number. The obtained results are compared with experimental results obtained by Sir Winston Churchill – Cho. The results show a very good approximation. Finally, a newcorrelation for predicting the free convective heat transfer coefficient around the cylinder in electrolyte solutions will be suggested.

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